You never send a claim. You still owe two documents.

Two documents, and only one of them is optional

If you practice privately in California there is a fair chance you have never filled in a CMS-1500 claim form and never intend to. You set a fee, the client pays it at the end of the session, and no insurer is anywhere near the transaction. The whole appeal of private pay is that the paperwork stops at your own books. The site’s rate research covers why so many California practices end up there.

Two documents follow you across that line anyway, and they are not the same kind of thing at all.

The good faith estimate is a federal legal requirement. It comes from the No Surprises Act, it has applied since 1 January 2022, and it applies to you specifically because your clients pay you directly.^[1] There is a complaints route and a dispute process attached to it. Most therapists who have heard of it believe it is about hospitals and surgery centers. It is not.

The superbill is not required by any law. No statute obliges you to produce one. It is a service you choose to offer, and the only reason to care about getting it right is that it is the single document standing between your client and a few hundred dollars of their own money. A superbill with a missing field is not a compliance problem. It is a denial letter.

Neither document is difficult. Both are routinely wrong, and they are wrong in different directions: the estimate is usually missing entirely, and the superbill is usually present but incomplete.

The good faith estimate, precisely

The statute is section 2799B-6 of the Public Health Service Act, codified at 42 U.S.C. §300gg-136. It requires every health care provider, on scheduling, to “inquire if such individual is enrolled in a group health plan, group or individual health insurance coverage offered by a health insurance issuer, or a Federal health care program” and, for those who are not, to furnish “a notification (in clear and understandable language) of the good faith estimate of the expected charges”.^[1] The operating detail is in the regulation, 45 CFR §149.610.^[2]

Here is the part therapists miss. The regulation covers “uninsured (or self-pay)” individuals, and the definition at §149.610(a)(2)(xiii) has two halves. The first is a person with no coverage. The second is a person who has benefits for the service “but who does not seek to have a claim for such item or service submitted to such plan or coverage”.^[2] That second half is your entire caseload. A client with a good PPO who chooses to see you privately is self-pay for this purpose. Their insurance card changes nothing. If you are handing them a superbill to submit themselves, you are not submitting a claim — so they are self-pay, and they are owed an estimate.

You also owe a standing notice that estimates are available at all. Section 149.610(b)(1)(iii) requires it to be written in clear and understandable language, prominently displayed on your website and in the office, and given orally when a session is scheduled or when charges are discussed.^[2] CMS publishes a one-page model notice for exactly this.^[9]

Those deadlines are §149.610(b)(1)(vi) and (vii).^[2] Note the shape of the first two rows: a session booked further ahead gets a longer window, not a shorter one. Read quickly, it looks backwards. It is not — the ten-business-day case simply gives you three days instead of one.

The contents are at §149.610(c)(1), and the list is short enough to memorise:^[2]

• Patient name and date of birth.
• A description of the primary item or service in clear and understandable language, with the scheduled date if there is one.
• An itemized list of everything reasonably expected to be furnished, grouped by provider.
• Applicable diagnosis codes, expected service codes, and expected charges for each item — that is, the ICD-10 code, the CPT code, and the dollar figure.
• Your name, National Provider Identifier and Tax Identification Number, and the state and office location where the work happens.
• Four disclaimers: that other services may be recommended and are not in the estimate; that this is an estimate and actual charges may differ; that the client can dispute a bill that comes in substantially over it; and that “the good faith estimate is not a contract and does not require the uninsured (or self-pay) individual to obtain the items or services”.

Recurring care gets one estimate, capped at twelve months. Section 149.610(b)(1)(x) allows a single estimate for recurring services provided it “must include, in a clear and understandable manner, the expected scope of the recurring primary items or services (such as timeframes, frequency, and total number of recurring items or services)” and “the scope of a good faith estimate for recurring primary items or services must not exceed 12 months”. If care is expected to continue past that, you must issue a new estimate and explain what changed between the two.^[2]

And it has to be re-issued when things move. Paragraph (b)(1)(vii) is broad: a new estimate is required if you anticipate or are notified of “any changes to the scope of a good faith estimate (such as anticipated changes to the expected charges, items, services, frequency, recurrences, duration, providers, or facilities)”, and it must reach the client “no later than 1 business day before the items or services are scheduled to be furnished”.^[2] A fee increase triggers it. So does moving a client from weekly to twice weekly.

Now the penalty, stated honestly, because the compliance industry overstates it. The figure everyone quotes is $10,000 per violation. That number is real, and it is in the statute at 42 U.S.C. §300gg-134(b)(1): the Secretary “may apply a civil monetary penalty… in an amount not to exceed $10,000 per violation”.^[5] But read what it attaches to. That penalty provision names the balance-billing sections — 42 U.S.C. §§300gg-131, 300gg-132 and 300gg-135 — not §300gg-136, the estimate section. HHS has not published a separate codified penalty schedule aimed at §149.610. What it did say, in the rule that created the requirement, is that “providers and facilities will be subject to enforcement action for failure to provide a good faith estimate” to self-pay individuals.^[6] There is a complaints process at 45 CFR §149.450, and HHS must respond to a complainant within 60 business days.^[7]

So the realistic exposure for a solo therapist is not a five-figure letter arriving unprompted. It is the dispute process, which is client-driven and cheap to start.

The $400 rule. Under 45 CFR §149.620, billed charges are “substantially in excess” of the estimate when they are “at least $400 more than the total amount of expected charges” on it, per provider.^[3] A client who is billed that much over can start patient-provider dispute resolution. The notice must be postmarked or submitted within 120 calendar days of the initial bill, and the client pays a $25 non-refundable administrative fee to file — deducted from what they owe if they win.^[4] The determination binds both sides. While the dispute is open you cannot move the disputed amount to collections, and if it is already there you have to stop.^[8]

What a defensible estimate for open-ended therapy looks like

This is the hard part, and it is the reason this page exists. The regulation was drafted for an episode of care — a knee replacement, a colonoscopy, a course of infusions. Those have an end. Psychotherapy frequently does not, and the guidance simply does not address the case where the provider genuinely cannot know whether the work runs six sessions or sixty.

Say that plainly to yourself before you build a template, because it means there is no officially blessed answer here. What follows is the defensible construction: it satisfies every element the regulation actually lists, and it fails safe.

• A stated per-session rate. $200 for a 45-minute individual session, CPT 90834. This is the only number the client genuinely needs, and the one they will actually use.
• A stated expected frequency. “Weekly, unless we agree otherwise.” The regulation asks for frequency by name.
• A stated horizon, and a total that matches it. Twelve months is the maximum the regulation permits on one estimate, so use it: 48 sessions at $200 is $9,600. Say in the document that this is the figure if care continues weekly for the full period, and that fewer sessions means a smaller bill.
• A stated re-issue trigger. One sentence: “If my fee changes, or we change how often we meet, you will get a new estimate at least one business day before the next session.” That is paragraph (b)(1)(vii) restated in plain English, and writing it down is what makes the re-issue habit stick.

The risk is asymmetric, and that should drive the total you write. The $400 rule only triggers when the bill comes in above the estimate. Nothing whatsoever happens if the client stops after eight sessions and the bill lands $8,000 below it. Combine that with §149.610(c)(1)(xi) — the estimate “is not a contract and does not require the uninsured (or self-pay) individual to obtain the items or services”^[2] — and the conclusion is straightforward. Estimate the horizon, not your guess at the outcome. A therapist who writes “12 sessions, $2,400” because that felt like a reasonable course of treatment, and then works with the client for eighteen months, has produced a bill roughly $7,000 over their own estimate. A therapist who wrote the twelve-month maximum has produced nothing to dispute.

There is a limit to that logic and it is worth naming: the document is called a good faith estimate. Padding the per-session rate, or writing a frequency you have no intention of offering, is not what this is. The rate must be your real rate and the frequency must be your real recommendation. It is only the total — the arithmetic of rate times frequency times horizon — where you should be describing the ceiling rather than your private forecast.

Where the guidance is genuinely thin: the diagnosis code. Paragraph (c)(1)(iv) requires “applicable diagnosis codes”, and the CMS model form has a field for them.^[2][8] But an estimate given at scheduling comes before the intake, which is precisely when you do not yet have a diagnosis. The word “applicable” is doing all the work in that sentence, and HHS has not published anything resolving it for behavioral health. The workable reading is that a code that does not yet exist is not applicable, so the first estimate carries the evaluation code 90791 with the diagnosis field marked as pending, and the twelve-month estimate issued after intake carries the real ICD-10 code. That is a reading, not a ruling. If you want certainty here, there is none available.

Use the CMS model form rather than building your own layout.^[8] It already carries the four required disclaimers in HHS’s own words, which removes the most common way of failing (c)(1) — paraphrasing a disclaimer into something narrower than the regulation says.

The superbill, field by field

A superbill is an itemized receipt formatted so that a client can send it to their own insurer and claim out-of-network reimbursement. You are not submitting anything. You are handing the client a document that has to survive a stranger’s adjudication system without you there to explain it.

Every one of these has to be present. A missing item is not a partial payment; it is a rejection.

• Your National Provider Identifier. Ten digits, free, from NPPES. Note that if you are private pay only and never transmit a HIPAA standard transaction, you are probably not a covered entity and are not required to have one — 45 CFR §162.410 says a provider that is not a covered entity “may obtain, by application if necessary, an NPI”.^[13] Get one anyway. Without it the superbill is unusable.
• Your license number and license type — LMFT, LCSW, LPCC, with the number as the BBS issued it. Insurers verify it.
• Your practice name, address, phone and Tax Identification Number (your EIN, or your SSN if you have no EIN).
• The client’s full name, date of birth and address, matching the insurer’s record exactly. A middle initial that does not match the policy is a real cause of denial.
• An ICD-10-CM diagnosis code. One at minimum, pointing at each date of service.
• A CPT code and units for each session.
• Each date of service, listed separately. A monthly total with no dates is not adjudicable.
• The charge per session and the total charged.
• Proof of payment — the amount paid and the date, or an explicit “paid in full” per line. Out-of-network reimbursement is a refund of money already spent, and an insurer will not refund a balance the client cannot show they paid.

On assigning a diagnosis. Some therapists decline to, on the reasonable view that a diagnostic label is a clinical act and not a billing convenience, and that giving one to a client who does not need one does them no favors. That position is coherent. What it is not is compatible with a reimbursable superbill. ICD-10-CM is the code set mandated under HIPAA for everyone it covers, not just providers who bill Medicare, and the FY 2026 edition took effect 1 October 2025.^[10] There is no such thing as a claim without a diagnosis code. So the honest options are two: assign a diagnosis you can defend in the record, or tell the client at intake that you do not produce superbills. Producing one with an invented or padded code to get it paid is insurance fraud, and telling the client “there’s nothing really wrong with you, I just put something down” is worse than either.

The codes. These are the ones a talk-therapy practice uses, with the time ranges HHS publishes.^[11] The times are what the code means — a 50-minute session is 90834, not 90837, and coding a 50-minute hour as 90837 because it feels like a full session is upcoding.

This is the same code set Medicare uses, which matters more than it used to: marriage and family therapists and mental health counselors have been able to enroll in Medicare and bill it independently since 1 January 2024, so the codes are now defined for our professions rather than borrowed from psychiatry.^[22] If you are weighing whether to leave private pay at all, the panels page prices that decision.

Telehealth: place of service and modifiers. Two codes describe where the client was, not where you were. HHS states it directly: “POS 02 refers to telehealth provided other than in patient’s home and POS 10 refers to telehealth provided in patient’s home.”^[12] For a client sitting at home, which is nearly all of them, that is POS 10. For audio-video sessions the conventional modifier is 95; for audio-only, HHS points to CPT modifier 93 (and Medicare’s FQ).^[12]

One caution, because a lot of 2026 billing commentary blurs it. Everything in the previous paragraph is Medicare policy. A superbill is not a Medicare claim — it goes to a commercial plan, and commercial plans set their own conventions and change them without notice. Medicare’s telehealth rules moved again for 2026, and none of those moves bind your client’s PPO. The practical answer is to put POS 10 and modifier 95 on remote sessions, in-office sessions with no modifier at POS 11, and treat a denial that cites place of service as a question to ask the plan rather than a mistake you made.

What the client actually gets back

This is the conversation that goes wrong most often, and it goes wrong because of one word. Out-of-network coverage is quoted to clients as a percentage — “my plan covers 60% out of network” — and the client hears 60% of what they pay you. It is not. Coinsurance is defined in the federal uniform glossary that every plan must use as “your share of the costs of a covered health care service, calculated as a percentage… of the allowed amount”, and the allowed amount is “the maximum payment the plan will pay for a covered health care service”.^[14] The plan sets that number. It has nothing to do with your fee.

Where does the plan get it? Usually from a usual-and-customary schedule — in the same glossary, “the amount paid for a medical service in a geographic area based on what providers in the area usually charge”.^[14] Plans do not publish these schedules. There is no table to look up, and this article will not invent one. The number below has to come from the client ringing the number on their card and asking for it by CPT code and ZIP.

So here is the arithmetic with the allowed amount left as the variable, on one concrete practice. Your fee is $200 for a 45-minute session, coded 90834. The client meets weekly and takes four weeks off, so 48 sessions in the year and $9,600 paid to you. Their plan has a $3,000 out-of-network deductible and pays 60% of the allowed amount after it.

The step everyone gets wrong is the deductible. Credit toward it accrues at the allowed amount, not at what the client paid. At an allowed amount of $120, each $200 session moves the deductible by $120, so it takes 25 sessions — nearly six months of weekly work, $5,000 out of pocket — before a single dollar comes back. The remaining 23 sessions reimburse at 60% of $120, which is $72 each. 23 × $72 = $1,656.

Two things about that bottom row. It is what the client pictures when they say “my plan covers 60%” — and no plan is obliged to allow your full fee, so it is the least likely row on the table. And even it does not reach 60%, because the deductible eats the first fifteen sessions before the percentage applies to anything.

The gap makes it worse in a way that is easy to miss. At an allowed amount of $120, the $80 difference between your fee and the plan’s number is not merely unreimbursed — it is invisible to the plan entirely. It does not count toward the deductible and it does not count toward the out-of-pocket limit, which the glossary defines as the most a member pays “for your share of the costs of covered services”.^[14] A client who hits their out-of-pocket maximum on a hospital admission in March will still be paying you $80 a session in December.

None of this is an argument against superbills. $1,656 is a real $1,656, and for a client on a tight budget it is the difference between finishing the year in therapy and stopping in August. It is an argument for saying the number out loud at intake, when it is information, instead of in month seven, when it is a complaint.

What California adds on top

Fee disclosure before treatment starts, enforced by your Board. Every BBS license type carries the same clause, worded identically, in the list of things that count as unprofessional conduct: “Prior to the commencement of treatment, failing to disclose to the client or prospective client the fee to be charged for the professional services, or the basis upon which that fee will be computed.” For LMFTs it is Business and Professions Code §4982(n)^[15]; for LCSWs, §4992.3(o)^[16]; for LPCCs, §4999.90(n)^[17]. Note where it sits. This is not a billing rule with a fine attached — it is a ground on which the Board may deny, suspend or revoke a license.

That is a useful accident of drafting, because the federal estimate and the state disclosure want the same information at the same moment. Hand the good faith estimate over with the fee agreement at or before the first session and both obligations are discharged by one document, with one date on it, filed in one place.

If you are an associate, the superbill question mostly answers itself. A registered AMFT must, under §4980.44, inform each client before providing services that they are “an unlicensed registered associate marriage and family therapist”, and give the registration number, the employer’s name and the supervisor’s credentials.^[20] A registration is not a license, and whether a plan will reimburse a registrant’s services out of network is entirely the plan’s decision — nothing in California law requires it to. Do not promise a client reimbursement you have no control over. The good faith estimate obligation, on the other hand, is about scheduling and charges and applies to whoever is doing the scheduling.

SB 855 and SB 221 are the leverage your client has, and most of them do not know it exists. SB 855, effective for plans issued or renewed from 1 January 2021, requires California-regulated plans to cover medically necessary mental health and substance use disorder treatment under generally accepted standards of care rather than the plan’s own internal criteria.^[19] SB 221 then added a timing standard with teeth: from 1 July 2022, Health and Safety Code §1367.03(a)(5)(F) requires nonurgent follow-up appointments with a nonphysician mental health provider “within 10 business days of the prior appointment” for someone in an ongoing course of treatment.^[18]

And §1367.03(a)(7)(B) says what happens when the network cannot deliver that: “If medically necessary treatment of a mental health or substance use disorder is not available in network within the geographic and timely access standards set by law or regulation, a health care service plan shall arrange coverage outside the plan’s contracted network.”^[18] On the insurance side, Insurance Code §10133.54(b)(7)(B) is explicit about the price: costs for medically necessary referrals to non-network providers “shall not exceed applicable in-network copayments, coinsurance, and deductibles”.^[18] The Department of Insurance says the same thing plainly — out-of-network care covered because the network was insufficient “is subject to the same out-of-pocket costs as in-network care”.^[19]

Read against the table above, that is the difference between $1,656 back and a $20 copay. It is worth one sentence at intake to a client who has already been told by their plan that nobody in network has an opening: you can ask your plan for a single-case agreement on network-inadequacy grounds, and here are the two code sections to quote. Whether they get it is not your problem, and you should not imply it is likely. But a client who never asks certainly does not.

The limit, and it is a large one. SB 855 and SB 221 reach plans regulated by the Department of Managed Health Care and insurers regulated by the Department of Insurance.^[19] They do not reach self-funded employer plans governed by ERISA, which is how a great many people at large California employers are actually covered, and they do not reach Medicare. Before quoting California law to a client, establish which kind of plan they have. If the card says “administered by” a carrier rather than “insured by” one, that is usually the tell, and the state protections probably do not apply.

What to do on Monday

Four hours of work, once, and then it is a habit rather than a project.

• Download the two CMS model documents. The model good faith estimate form^[8] and the one-page “Right to Receive a Good Faith Estimate” notice.^[9] Put the notice on your website and print one for the waiting area. Use HHS’s wording for the disclaimers rather than your own.
• Fill the form in once as a template with your NPI, TIN, license number, address, fee, 90834 or 90837, weekly frequency, 48 sessions, twelve-month horizon. Every future estimate is that file with a name and a date changed.
• Get an NPI if you do not have one. Free, online, same week, and every superbill you will ever write needs it.^[13]
• Diarise the re-issue. Twelve months from each estimate, and immediately on any fee change or frequency change — the new one is due at least one business day before the next session.^[2]
• Build the superbill template with every field from the list above, including a paid-in-full line. Test it by reading it as if you were an adjudicator who has never heard of you.

What your software does and does not do. SimplePractice generates good faith estimates, auto-populates most of the client and clinician fields, tracks an expiration date and sends you a notification 30 days before it lapses.^[21] That last feature is genuinely the useful one, because forgetting the twelve-month re-issue is the most likely way a compliant practice drifts out of compliance. What it does not do is decide your horizon, choose your diagnosis code, or verify that your disclaimers still match the regulation — and its own documentation says so: “It’s the responsibility of each respective provider to ensure their Good Faith Estimates and Consent Disclaimers are in compliance with local, state, and federal guidelines.”^[21] The SimplePractice page covers what the rest of it costs and automates.

And then the sentence. Most of the trouble in this entire article is prevented by saying one thing at the first contact, before the first session, out loud:

Set the fee in that sentence deliberately rather than by feel. The practice simulator takes your rate and caseload through expenses, self-employment tax and California income tax to the number that lands in your account, and you want to have seen that before you write $200 into a document that governs the next twelve months.