A step-by-step guide for MDs, DOs, NDs, NPs and PAs opening a cash-pay or membership functional medicine practice. Every number links to its source, with the date we checked it. Nothing here is legal, tax, or financial advice; where a decision has legal weight, we say so and tell you to get counsel.
Most guides on how to start a functional medicine practice open with a definition of functional medicine. This guide starts where the clinicians we talk to actually start: with the three questions that can keep some from ever starting in the first place.
The three questions every clinician asks when they go into the business of clinical practice
Will I have enough patients? Will I make payroll? What do I charge?
Health care practitioners are not trained to be great business people. Michael Woo-Ming, MD, who built a cash practice, left medicine, and came back to it, wrote on KevinMD that "the first two years of that practice were awful" and that more than once he sat deciding whether to pull from personal savings to cover payroll. A PA-C who started and later left a functional medicine practice put it in one line: "I put a lot of my savings into the business – not recommended!"
The answers, in short.
Will I have enough patients? Build referral sources that keep working without you: clinicians, trainers and dietitians who see your ideal patient, a Google Business Profile with reviews, and one educational channel like a newsletter. Then put your energy into keeping the patients you have.
Will I make payroll? Start lean and virtual, with no rent or front-desk staff. Sell programs paid up front so cash arrives before care is delivered. Use contractors before employees, hire only when revenue already covers it, and keep several months of expenses in reserve.
What do I charge? Define your patient avatar: their problem, what they'll pay to solve it, and what they can afford. Add up your cost to care for one patient, then price for a healthy margin. Set it before you open, because raising it later is hard.
The ten steps below are ordered the way the decisions cascade, starting with the one that shapes all the others, and they keep spending low while your practice grows.
Step 1: Choose your care philosophy, because everything cascades from it
Nobody opens a cash-pay practice because they're excited about billing models. You do it because you want to practice a certain kind of medicine, whether functional, integrative or longevity, and insurance-based care doesn't support it: not the visit length, not the testing, not the depth of the relationship. Name that philosophy first, in writing, because every decision in this guide cascades from it: who you serve, what you sell, how patients pay you, and what your technology has to do.
Then decide on training, because it's the decision with the longest lead time. Certification is optional to open. Your clinical license is what lets you practice, and patients will choose you because you listen, you get results and they can reach you. But if formal training is part of how you want to practice, enroll before you launch: these programs take a year or more to complete, and they can run in parallel with everything else in this guide. IFM is built around functional medicine, A4M around longevity medicine, and the Andrew Weil Center around integrative medicine, so let your philosophy pick your program. They are a real investment, from about $14,000 for IFM to more than $34,000 for the Weil Center's two-year fellowship. One benefit that's easy to overlook is the directory each organization runs, where patients go looking for a clinician like you. IFM's lists thousands of practitioners and shows certified ones first, and A4M's lets patients filter by fellowship and certification. Once you're listed, it becomes a steady source of new patients that doesn't depend on you posting every day.
Step 2: Decide who you serve and what you charge
With your philosophy named, your niche is the next decision, because it drives your pricing, your marketing and your care model. "Busy professionals with gut and metabolic issues" is a practice. "Root-cause medicine for everyone" is a hobby with overhead.
Write down your patient avatar before you do anything else:
- Who they are: age, life stage, work, where they live
- The problem they'll pay to solve, in their words
- What they've already tried, and why it didn't work
- What they can afford, and how they'd rather pay (monthly or up front)
- Where they already go for help: which clinicians, trainers, gyms and communities
That last answer becomes your referral list in Step 9.
Step 3: Pick your cash-pay model
Your care model requires two decisions before you set a price: where you see patients and how they pay you. Each one changes what it costs you to care for a patient.
Start virtual if you can. Seeing patients by telehealth first lets you build your practice without rent, while you test your niche and programs with real patients. A PA-C who started and later left a functional medicine practice recommends starting virtual as a way to "get your feet wet." Add a brick and mortar location once your practice income can fund it. Just remember you must be licensed in the state where the patient is located at the time of the visit.
Then choose how patients pay. There are four common models, and the right one depends on the kind of care you deliver and the patient you described in Step 2. A patient with one problem and a finish line buys differently than a patient who wants a doctor for the next decade.
Fee-for-service. The patient pays per visit. It fits episodic, consult-style care: second opinions, one-off deep dives, patients who want to try you before committing. It is the easiest model to explain and the fastest to start, which is why many practices keep it as an on-ramp even after they add other models. The tradeoff is that your revenue starts over at zero every month, and nothing in the model gives the patient a reason to come back.
Packages or programs. The patient pays for a set course of care, like a 3-month gut protocol or a 6-month metabolic program, up front or in installments. Programs fit condition-focused care with a defined arc: gut, metabolic, hormone, fertility, autoimmune. The patient is buying an outcome with a finish line, which is exactly how your Step 2 avatar thinks if they came to you with one problem they've already tried to solve. You get predictable revenue and cash before care is delivered, and the patient has a built-in reason to stay engaged through the end. The tradeoff: when the program ends, so does the revenue, so you need a plan for what happens next.
Membership. The patient pays a monthly or annual fee for ongoing visits, messaging and access. Membership fits longitudinal care: longevity and prevention-focused practices, complex chronic patients who need ongoing management, and anyone whose value proposition is "I know your whole history and you can reach me." These patients are buying a relationship, not a protocol. It is the most stable model once it fills, and the slowest to fill, because you're asking for a commitment before the patient has experienced the care. One of the physicians in a Longevity Docs roundup of launch mistakes put it this way: "Membership was slow for almost two years. Fee for service kept the lights on."
Hybrid. A hybrid practice keeps some insurance contracts while the cash side grows. A dermatologist and her practice co-founder described the process on KevinMD: drop insurance contracts "a few at a time, over 6 to 12 months", starting with the plans that pay the least and send you the fewest patients.
The same four models, side by side. For each: the care it fits, the patient it fits, how cash flows, and the main risk.
Fee-for-service
- Fits this kind of care: Episodic visits, consults, second opinions
- Fits this patient: Trying you out, or has an occasional need
- Cash flow: Starts at zero every month
- Main risk: No built-in retention
Packages / programs
- Fits this kind of care: Condition-focused protocols with a defined arc (gut, metabolic, hormone)
- Fits this patient: Has one problem and wants an outcome
- Cash flow: Up front, predictable per cohort
- Main risk: Revenue ends with the program
Membership
- Fits this kind of care: Longitudinal, longevity, prevention, complex chronic care
- Fits this patient: Wants ongoing access and a long-term relationship
- Cash flow: Recurring, most stable once full
- Main risk: Slow to fill
Hybrid (insurance + cash)
- Fits this kind of care: Transition from an insurance practice
- Fits this patient: Existing panel you're converting
- Cash flow: Insurance floor while cash grows
- Main risk: Confusing if it becomes permanent
In practice, most cash-pay practices combine models and sequence them: fee-for-service or a program keeps the lights on early, and patients who finish a program move into a membership. The combination that works is the one that matches how your avatar wants to buy.
Pro tip: Don't stay hybrid. The same KevinMD authors are direct about it: "avoid being hybrid forever. This will confuse new and established patients." Treat hybrid as temporary and set the date you'll go fully cash-pay.
Step 4: Deal with Medicare before you see your first patient
Most guides skip this step, and it's the one most likely to get you in trouble. It is also the one step in this guide where we'll tell you plainly: talk to a healthcare attorney before you decide. The rules are federal, the penalties are real, and the right answer depends on your license, your state, your services and your patient mix. What follows is orientation, not legal advice.
Here is the shape of the problem. If you furnish a Medicare-covered service to a Medicare beneficiary, you generally can't just charge them cash; Medicare's rules on billing and charge limits apply. Clinicians who want to see Medicare patients purely on a cash basis typically opt out: file an affidavit with their Medicare Administrative Contractor and sign a private contract with each Medicare patient. Under those contracts, Medicare pays nothing for your services, with narrow exceptions for emergency and urgent care.
Two nuances make this harder than it sounds, and both are exactly why you want counsel:
- "Covered" is the whole question. Some of what a functional medicine practice sells (extended consultations, coaching, certain tests and services) may not be Medicare-covered at all, and non-covered services can generally be billed to the patient directly. But whether a given service is covered is a determination with real consequences if you get it wrong, and it isn't always obvious from the service name.
- Opting out is binding. An opt-out lasts two years and renews automatically, and once the cancellation window passes you're committed for the term, across all your Medicare patients, not just the ones you had in mind. MDs, DOs, NPs and PAs can opt out. NDs aren't Medicare providers, so this step doesn't apply to them.
If a meaningful share of your patients will be over 65, read CMS's Benefit Policy Manual, Chapter 15, Section 40, then bring your service list and your model from Step 3 to a healthcare attorney and decide together: opt out, structure around non-covered services, or keep Medicare patients out of your panel. One meeting now is cheaper than one audit later.
Step 5: Set up your business and licensing
Free, and done in one afternoon
- EIN. Get one free from the IRS.
- NPI. Also free from CMS. Get one even if you never bill insurance, because labs, pharmacies and referral partners will ask for it.
- S corp election. An LLC can choose to be taxed as an S corporation by filing IRS Form 2553. Ask your accountant whether it's worth it in year one. Often it isn't until the practice has real profit.
Depends on your state
- Entity type. Many states limit who can own a medical practice, which often means forming a professional corporation or PLLC instead of a regular LLC. One 50-state guide counts 33 states with corporate practice of medicine laws and names California, Texas and New York as the strictest about enforcing them. This is another place where an hour with a healthcare attorney before you file saves you from re-forming the entity later. Check with your state's medical board too.
- NP practice authority. As of September 2025, 27 states plus DC give NPs full practice authority. Everywhere else, you'll need a collaborating or supervising physician agreement before you open, so budget for it.
- Telehealth. You must be licensed in the state where the patient is located at the time of the visit.
Protect yourself
- Malpractice. For an NP with 1M/3M limits, one carrier (Berxi) lists a typical policy at about $1,700 a year. Rates vary by specialty, state and history, so whatever your license, get quotes from at least two carriers.
- HIPAA. A practice that never files insurance claims may not technically be a covered entity under HHS's definition. Follow HIPAA anyway, and have every vendor that handles patient data sign a Business Associate Agreement.
- CLIA. If you'll run tests in the office, you need a CLIA Certificate of Waiver. It was $248 per two years on the January 2024 fee schedule, so check the current fee when you apply.
Step 6: Build the tech stack around cash pay
An insurance practice buys software to get paid by insurers. A cash practice buys software to get paid by patients and to give them a reason to keep investing in their health journey with you. The good news is that you need fewer tools than you think.
Your EHR is the one decision worth slowing down for. It's the tool you can't skip, and the hardest one to switch out of once your patient records live there. Look for one that handles membership and package billing, connects to your labs so orders and results live in the chart, gives patients an app they can message you through, and doesn't leave you charting at 10pm. The real cost of a cheap EHR isn't the subscription; it's every workflow it doesn't cover, because each one becomes another tool, another login and another place patient data lives. Our guide to the best EHRs for functional, integrative and longevity medicine compares the main options, and our cost breakdown prices out the full stack. Read both before you sign anything with a minimum contract term.
Labs: the decision is workflow, not just vendor. You have three ways to order labs in a cash practice: open direct accounts with the national labs (Quest, Labcorp) and any specialty labs your niche needs; use a lab ordering platform that aggregates many labs behind one login, usually with cash pricing that's HSA/FSA eligible; or order through your EHR, if it integrates lab ordering and results directly. The first two work, but they put your results in another system, which means downloading PDFs and re-entering values if you want to trend a patient's markers over time. In a practice built on longitudinal data, that re-entry becomes real weekly work. If your platform integrates labs the way Ultralight does with Quest, Labcorp and specialty labs through Fullscript, orders go out and results come back inside the chart, already trended. Whichever route you take, decide up front whether labs are bundled into your program price or paid by the patient separately, because it changes your cost per patient in Step 7.
Supplements: set your policy before launch. Virtual dispensary platforms are typically free for the practice to join, and you choose between passing a discount to patients or taking a margin. Either is defensible. What isn't is surprising patients: decide your policy before launch and share it in writing.
Payments are priced per transaction. Stripe charges 2.9% plus 30 cents per card transaction. Square charges 2.6% plus 15 cents in person and 3.3% plus 30 cents online, with no monthly fee on its free plan. If your EHR already handles memberships and saved cards, you may not need a separate payment tool at all.
Step 7: What it costs to start a functional medicine practice
Almost every guide to starting a functional medicine practice publishes a startup cost range, and almost none of them say where the number came from. We'd rather show you what we could verify and be honest about where you'll need a local quote.
What it costs to open
- EIN and NPI: free (IRS, CMS)
- Entity formation: state filing fees vary, and attorney drafting is the real cost, so get a quote
- Malpractice: about $1,700 a year for an NP with 1M/3M limits per one carrier's listed rate (Berxi); get quotes from at least two carriers
- CLIA waiver, if you test in the office: $248 per two years on the January 2024 schedule
- Lab and dispensary accounts: typically free to open; costs are per order
- Payments: no fixed cost, just a fee per transaction (Step 6)
- EHR and other software: itemized in our cost breakdown
- Certification, optional: from about $14,000 to more than $34,000 (Step 1)
- Legal: a healthcare attorney for entity formation and your Medicare decision (Steps 4–5); budget for a few hours of counsel
- Space, build-out and staff: the biggest costs, and the ones no national number can answer. Starting virtual lets you put off all three
Look at how little on that list is fixed. Almost everything a virtual practice needs to open is free or charged per use. The real money goes to space, people and the months before your schedule fills, so that's what to plan for.
What it costs to care for one patient
Next, add up what it costs you to care for one patient over a program or a membership year. This is the number your price has to cover in Step 8.
- Your time, at the hourly rate you'd pay yourself
- Any labs or supplements you include in the price
- Your monthly software costs, divided by the number of patients
- Payment processing on what the patient pays you
- Any assistant or staff time spent on that patient
Step 8: Set your price
Price is the decision you most need to get right on day one. The regret we hear most from clinicians who launched is underpricing. Another physician in the same Longevity Docs roundup said it plainly: "I should have started pricing higher" and "that's harder to walk back now."
Work it out in three steps:
- Start with your cost to care for one patient from Step 7.
- Add your margin. It covers overhead you haven't counted, your cash reserve and profit.
- Check it against your avatar. If they can't afford it, change what's included, not the margin.
Write the number down before you talk to a single patient.
Step 9: Find patients who stay
Patients rarely find a brand-new practice on Google. They find it through people who already know and trust you. Start there.
If you're leaving a practice where you can still talk to your patients, tell them about your new model. A primary care physician who converted to direct care described setting aside "a little time during every visit" to do exactly that. If you can't, go to your referral network: the clinicians, trainers, therapists and dietitians on the list you made in Step 2.
Then build the sources that keep sending patients without your daily effort: a free Google Business Profile with patient reviews, a one-page website that says who you serve, how your model works and what it costs, a listing in your certifying organization's directory (Step 1), and one educational channel you'll actually keep up, like a newsletter.
Hold off on paid ads. In the Longevity Docs roundup, one physician shared that he spent $20,000 on local ads while his social account grew to 17,000 followers with no real strategy behind it. His regret was not putting that money into the channel that was already working.
Once patients come in, put your energy into keeping them. Every patient who stays is one you don't have to go find, and happy patients are how practices fill up. They tell their friends.
Step 10: Run it like a CEO without burning out
Two things end practices: running out of cash and burning out the founder. You're the CEO of your practice now, and protecting both is part of the job.
On cash flow, the clinicians who made it describe the same discipline. Michael Woo-Ming said the thing he's proudest of is that he has "always made payroll." Another physician in the same roundup put it simply: "Make money first, assess patient needs and then buy one thing at a time." Sell programs up front, protect your reserve, and add a cost only when revenue already covers it.
On burnout, the same PA-C remembers her first practice as "working 7 days a week, 12 hours a day" while trying to keep everyone happy. Her advice is to get help early, whether that's a virtual assistant, a mastermind group, or a loan if you need one. The isolation is real, too. Shiv K. Goel, MD, wrote that there's "no one to tell you whether what you are building is working." Find two other founders at your stage before you launch, and meet monthly.
And protect your time. Membership patients are paying for access, and access needs limits. One physician told the Longevity Docs roundup, "I changed my cell number because of this." Put messaging inside your patient app with stated response times, and keep your phone yours.
Your functional medicine practice launch checklist
- Care philosophy named and, if you want certification, program enrolled (Step 1)
- Niche, avatar and care model written down (Steps 2–3)
- Medicare decision made with a healthcare attorney and, if opting out, affidavit filed (Step 4)
- Entity formed, EIN and NPI in hand, malpractice bound, BAAs signed (Step 5)
- EHR live with intake forms, scheduling, saved cards and patient messaging (Step 6)
- Lab ordering set up (integrated or standalone), patient billing policy written (Step 6)
- Cost per patient and price written down (Steps 7–8)
- Google Business Profile, one-page website and directory listing live, referral list contacted (Step 9)
- First 10 patients booked before launch day
After you launch, track three numbers every month: new patients by source, revenue per patient, and hours you spend on admin. When admin hours start climbing, fix the system before you hire.
If you are leaning longevity
Many of the clinicians we talk to start with functional medicine and add longevity services within a year, like advanced lipids, body composition, VO2 max and wearables. Everything above still applies. What changes is your baseline testing, how you price a membership, and the level of evidence you'll need behind your recommendations, and that deserves its own guide. Until we publish it, start with what longevity medicine is, for clinicians and the four tests that predict how your patients age.
Where Ultralight fits
We built Ultralight for the practice described above. Cash-pay and membership billing, integrated lab ordering and results, a patient app with messaging, and AI charting all live in one platform, so most of the tech stack in Step 6 becomes one decision. If you have fewer than 50 patients, you can apply for special pricing on our Launch plan, which also gives you a community of clinicians, webinars and resources as you get started. If you're still in the planning stage, book a demo and bring your questions from this guide. We'll tell you honestly if we're not the right fit yet.
FAQ
How much does it cost to start a functional medicine practice?
Less than the guides claim, if you start virtual. EIN, NPI, and lab and dispensary accounts are free; malpractice for an NP runs around $1,700 a year per one carrier's listed rate; payments are usage-priced. The real costs are space, staff and the months before your panel fills. Step 7 itemizes what we could verify.
Can a nurse practitioner open a functional medicine practice?
Yes. As of AANP's September 2025 brief, 27 states plus DC and two territories give NPs full practice authority. Elsewhere you need a collaborating or supervising physician agreement, and your state's corporate practice of medicine rules may shape the entity you form.
Do I need IFM certification to start a functional medicine practice?
No. Your clinical license is the license. IFM's FMCP-M credential requires at least 100 hours of accredited training (150 from January 2027) and IFM estimates its core curriculum at $13,000 to $17,000, plus $1,300 in application and exam fees. If you do want the credential, enroll before you launch: programs take a year or more, and training can run alongside building the practice.
Do I have to opt out of Medicare to run a cash-pay practice?
It depends on whether you'll furnish Medicare-covered services to Medicare beneficiaries, and that determination is exactly where clinicians get into trouble. If you will, the standard path is to opt out: file an affidavit with your MAC and sign a private contract with each Medicare patient. Opt-out lasts two years and renews automatically. Make this decision with a healthcare attorney, not a blog post, ours included.
Can I run a virtual-only functional medicine practice?
Yes, and it is how several clinicians we quote above recommend starting. You must be licensed in every state where your patients are located at the time of the visit.
Is a cash-pay functional medicine practice profitable?
It can be, and the clinicians who describe it say the first one to two years are the hard part. Underpricing at launch and paying for ads before an organic channel works are two of the mistakes clinicians in the Longevity Docs roundup cite.
Fee-for-service, packages or membership: which model should I start with?
Match the model to your care and your patient (see the four models in Step 3). Episodic care and patients testing the waters fit fee-for-service; condition-focused protocols with a finish line fit packages, and fill fastest; longitudinal and longevity care fits membership, which is the most stable and the slowest to fill. Most practices sequence them: programs first, membership as patients graduate. Hybrid with insurance is a bridge you should plan to cross.
Sources
All retrieved September 29, 2026.
- CMS, Manage Your Enrollment (opt-out eligibility, renewal): https://www.cms.gov/medicare/enrollment-renewal/providers-suppliers/chain-ownership-system-pecos/manage-your-enrollment
- CMS, Medicare Benefit Policy Manual, Chapter 15, Section 40 (private contracts): https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/bp102c15.pdf
- CMS, NPI is free: https://www.cms.gov/Regulations-and-Guidance/Administrative-Simplification/NationalProvIdentStand/Downloads/9-06september_message.pdf
- HHS, Covered Entities: https://www.hhs.gov/hipaa/for-professionals/covered-entities/index.html
- CMS, CLIA Certificate Fee Schedule (effective January 27, 2024): https://www.cms.gov/files/document/clia-certificate-fee-schedule.pdf
- HHS Telehealth, Getting started with licensure: https://www.telehealth.hhs.gov/licensure/getting-started-licensure
- IRS, Get an EIN: https://www.irs.gov/businesses/small-businesses-self-employed/get-an-employer-identification-number
- IRS, About Form 2553: https://www.irs.gov/forms-pubs/about-form-2553
- AANP, Issues at a Glance: Full Practice Authority (updated September 2025): https://www.aanp.org/advocacy/advocacy-resource/policy-briefs/issues-full-practice-brief
- Permit Health, Corporate Practice of Medicine 50-State Guide (December 2025): https://www.permithealth.com/post/the-corporate-practice-of-medicine-50-state-guide
- Berxi, Nurse Practitioner Malpractice Insurance: https://www.berxi.com/insurance/nurse-practitioner/
- IFM: FMCP-M, Eligibility, Certification fees, program cost: https://www.ifm.org/certification/fmcp-m, https://www.ifm.org/certification/eligibility, https://www.ifm.org/certification/fees, https://help.ifm.org/how-much-does-the-certification-program-cost-from-start-to-finish
- Fullscript, pricing and profit dispensaries: https://fullscript.com/pricing, https://support.fullscript.com/articles/profit-dispensaries
- Stripe, pricing: https://stripe.com/pricing
- Square, pricing: https://squareup.com/us/en/pricing
- Ultralight, pricing: https://www.ultralighthealth.com/pricing
- KevinMD, Nagalla and Koppula, How to start your own cash-pay medical practice (June 2024): https://kevinmd.com/2024/06/how-to-start-your-own-cash-pay-medical-practice.html
- KevinMD, Woo-Ming, Why I left insurance-based medicine and came back (August 2026): https://kevinmd.com/2026/08/why-i-left-insurance-based-medicine-and-came-back.html
- KevinMD, Goel, Why leaving hospital medicine for private practice was worth the risk (April 2026): https://kevinmd.com/2026/04/why-leaving-hospital-medicine-for-private-practice-was-worth-the-risk.html
- NonClinical Physicians podcast, Woo-Ming: https://nonclinicalphysicians.com/cash-based-medical-practice/
- A PA-C's account of starting and leaving a functional medicine practice (personal blog): https://megmcelroy.com/what-i-learned-from-starting-and-leaving-a-functional-medicine-practice/
- Hint Health blog, a primary care physician's conversion to direct care: https://blog.hint.com/brett-swenson-converting-to-direct-care-minimal-risk
- Longevity Docs, Mistakes to avoid when launching a longevity practice: https://longevitydocs.org/blogs/news/mistakes-to-avoid-when-launching-longevity-practice
