Claims guide

Medicare Behavioral Health Billing for Therapists and Psychiatrists

Medicare behavioral health billing is how a psychotherapist or psychiatrist enrolls in Medicare Part B, chooses an enrollment status, and gets paid for covered mental health services. The rules differ by license type, and your choices at enrollment shape every claim that follows. This guide walks the path from the CMS-855I application to your first clean claim.

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What Medicare behavioral health billing covers

Medicare behavioral health billing means billing Original Medicare (Part B) for the diagnosis and treatment of mental illness. Enrollment comes first. A Medicare Administrative Contractor (MAC) processes enrollment and claims for your area.

Individual physicians and non-physician practitioners apply on Form CMS-855I. CMS calls the online system, PECOS (Provider Enrollment, Chain and Ownership System), the faster and preferred route, according to the CMS enrollment application page. PECOS also handles updates and reassigning benefits to a group.

This page covers Original Medicare only. Medicare Advantage plans carry their own contracts and rules, so treat each one like a private payer. Our private insurance guides show how to read those contracts.

Good Medicare behavioral health billing comes down to three decisions: whether your license qualifies, whether you will be participating, and how you will handle services Medicare may not cover. The sections below take them in that order, so you can plan Medicare behavioral health billing with fewer surprises.

Who can enroll: Medicare behavioral health billing by license

Medicare behavioral health billing starts with your license, and the requirements are not the same for each type.

Medicare behavioral health billing basics by license type (checked 10/10/26)
License	Basic requirement	Enrollment notes
Clinical psychologist	Doctoral degree in psychology and a state license at the independent practice level	Paper CMS-855I or PECOS, CMS-588 for direct deposit, CMS-460 if participating
Clinical social worker	Master's or doctoral degree in social work, two years of supervised clinical social work, and state licensure or certification	CMS-855I with PECOS recommended, CMS-588 unless exempt
Marriage and family therapist (MFT)	Master's or doctoral degree, two years or 3,000 hours of post-degree supervised experience, and state license	Covered for dates of service on or after January 1, 2024; specialty code E1
Mental health counselor (MHC)	Same structure as MFTs: degree, supervised experience, and state license or certification	Covered since January 1, 2024; specialty code E2
Psychiatrist	Physician enrollment	Individual physicians use the CMS-855I

Can a therapist do Medicare behavioral health billing?

Yes, if the therapist holds a license Medicare recognizes and enrolls first. Clinical psychologists and clinical social workers have long been recognized. Marriage and family therapists and mental health counselors became eligible for dates of service starting January 1, 2024. Psychiatrists enroll as physicians.

What changed for MFTs and counselors

A CMS transmittal on MFT and MHC coverage (Section 4121 of the Consolidated Appropriations Act, 2023) sets the rules. MFTs and MHCs self-designate their specialty on the CMS-855I or in PECOS. Medicare pays 75% of the physician fee schedule amount for their services, and they must accept assignment.

The same transmittal says Medicare denies these services during a hospital inpatient stay and in place of service (POS) codes 21, 51, and 61. Expect denial code CARC 171 with RARC N428 when that happens. The claim denial terms glossary explains how to read those codes.

6 steps to start Medicare behavioral health billing

Follow these steps in order for clean Medicare behavioral health billing from day one. The MAC reviews everything you submit, so gaps slow the application.

Confirm your license. Match your degree, supervised hours, and active state license to the table above.
Gather documents. You may need a copy of your state license if it cannot be verified online, education records if requested, and bank proof for direct deposit.
Complete the CMS-855I. Use PECOS when you can. Pick your specialty, which matters most for MFTs and counselors.
Sign the certification statement. Sign and date it. In PECOS you can e-sign or upload a signed paper copy. Stamped signatures are not accepted.
Set up payment. Submit the CMS-588 electronic funds transfer form unless you already get Medicare direct deposit or you reassign benefits to a group.
Choose your participation status. If you want to be participating, include the CMS-460 agreement with your application.

The psychologist, clinical social worker, and MFT enrollment pages from one MAC list these same documents. Your own MAC may word things slightly differently, so check its page for your state.

Once you are approved, claims go out on the CMS-1500 claim form. MCM South works behavioral health claims every week for psychotherapists and psychiatrists, and the enrollment choices above show up on every one of them.

Assignment and participation in Medicare behavioral health billing

Assignment means you accept the Medicare allowed amount as payment in full. The CMS participation announcement describes three paths, and the right one depends on your license and your practice model.

Participating, non-participating, and opt-out compared for Medicare behavioral health billing (checked 10/10/26)
Status	What it means	Payment effect
Participating	You sign the CMS-460 and accept assignment on all covered services	Full fee schedule amount; you cannot bill more than the deductible and coinsurance
Non-participating	No agreement; some practitioners may accept assignment case by case	Paid 5% less than the fee schedule; unassigned charges are capped by the limiting charge
Opt-out	A separate private-contract route, not a participation level	You do not bill Medicare for covered services; confirm current rules before using it

The limiting charge is the most a non-participating provider can charge on an unassigned claim. One MAC's participation and limiting charge explanation puts it at 115% of the non-participating fee. That works out to about 109.25% of the participating fee.

CMS opens a yearly window from mid-November through December 31 to change status. New providers submit the CMS-460 with their enrollment application. Providers who want to stop participating must notify each MAC in writing.

Opt-out is different. An older CMS review explains that private contracts let certain practitioners treat Medicare patients without billing Medicare, and the restriction on billing lasts two years. Because opt-out affects which practitioner types qualify, confirm the current rule with your MAC and counsel first.

When an ABN fits in Medicare behavioral health billing

The Advance Beneficiary Notice of Noncoverage (ABN, Form CMS-R-131) tells an Original Medicare patient, before the visit, that Medicare may not pay. If the patient signs and agrees to pay, you can bill the patient. The CMS claims processing manual chapter on ABNs sets the rules.

Required: when Medicare usually covers the service but you expect a denial because it is not reasonable and necessary.
Voluntary: for services Medicare never covers. The patient should not be asked to pick an option or sign.
Timing: deliver it before the service, ideally in person. Do not issue it during an emergency.
Repeat care: one ABN can cover repetitive care for up to a year if the care does not change.
Records: give the patient a copy and keep the signed original, generally for five years.
Limits: only enrolled providers can issue it, and it does not apply to Medicare Advantage.

A missing or defective ABN can leave you liable for the cost, and you may owe refunds if you already collected money. Build the ABN step into your Medicare behavioral health billing intake workflow so it happens before the session, not after the denial.

Medicare, Medicaid, and private payers: keep the rules apart

Medicare (Original)

Federal rules apply to Medicare behavioral health billing. Enrollment goes through the MAC, and payment follows the Medicare Physician Fee Schedule. Everything above this section belongs here.

Medicaid

Medicaid is run by each state, and states often use managed care plans. A Medicare rule does not carry over. Check your state Medicaid agency before you bill, and read credentialing and network status before you apply to a plan.

Private insurance

Commercial and Medicare Advantage plans write their own contracts. Network status changes what you can charge, so review in-network vs out-of-network credentialing. Our credentialing service page explains how MCM South approaches applications for psychotherapists and psychiatrists.

The simplest habit in Medicare behavioral health billing is to label each claim by payer type in your system before you submit. That one label prevents most cross-payer mistakes. See the reimbursement terms glossary for the vocabulary.

What to do Monday morning

Write down your license type and match it to the Medicare behavioral health billing table on this page.
Check whether you are enrolled in PECOS and whether your information is current.
Decide on participating or non-participating status before the yearly window closes on December 31.
Add an ABN check to your intake checklist for any service you expect Medicare to deny.
Review your last remittance for CARC and RARC codes in the electronic remittance advice guide.

Frequently asked questions

Can a licensed professional counselor bill Medicare?

Yes. Mental health counselors can bill Medicare for dates of service starting January 1, 2024, after they enroll. A CMS transmittal says Medicare pays 75% of the physician fee schedule amount for these services, and counselors must accept assignment.

Should I be participating for Medicare behavioral health billing?

Participating means you sign the CMS-460, accept assignment on all covered services, and receive the full fee schedule amount. Non-participating pays 5% less. MFTs and counselors must accept assignment either way. Model both options with your biller before the yearly window closes.

Do I need an ABN for every Medicare behavioral health billing claim?

No. An ABN is required only when you expect Medicare to deny a service that it usually covers, such as for medical necessity. It is voluntary for services Medicare never covers. It does not apply to Medicare Advantage.

How do I start Medicare behavioral health billing as a therapist?

For Medicare behavioral health billing, complete the CMS-855I, preferably through PECOS, and sign the certification statement. Add the CMS-588 for direct deposit and the CMS-460 if you want to be participating. Your MAC reviews the application and may ask for a state license copy.

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