How counselors and MFTs enroll in Medicare: the CMS-855I and proof

Counselors and marriage and family therapists enroll in Medicare through PECOS or a paper CMS-855I sent to their Medicare Administrative Contractor, after an I&A account and an NPI; where state licensure did not require 2 years or 3,000 hours of post-master's supervised experience, proof on the provider's letterhead goes with the file, or the MAC asks for it.

Medicare opened to both professions on January 1, 2024, when marriage and family therapists (MFTs) and mental health counselors (MHCs) could begin billing Medicare independently for services that diagnose and treat mental illness, according to CMS's page for MFTs and MHCs. CMS's article MM13331, released November 9, 2023, says both complete the Form CMS-855I and face limited-risk screening. Neither pays an application fee.

How do counselors and MFTs enroll in Medicare?

Counselors and MFTs enroll in Medicare in the three steps CMS lists: an account in the Identity & Access Management (I&A) System, an NPI from the National Plan & Provider Enumeration System (NPPES), and an application through PECOS or on the paper CMS-855I. The NPI carries taxonomy code 106H00000X for a marriage and family therapist or 101YM0800X for a mental health counselor, per CMS's provider enrollment FAQ for MFTs and MHCs, dated May 2024.

The CMS-855I also covers a practitioner who solely owns a professional corporation or LLC that bills Medicare. Enrollment in Medicaid does not enroll a practitioner in Medicare.

The table lists each piece of a counselor's or MFT's Medicare enrollment file, where it goes, the rule or timing that governs it and the official source.

Which specialty do you choose on the CMS-855I?

On the paper CMS-855I, a counselor or MFT selects the Undefined Non-Physician Practitioner Specialty option in section 2H and writes MFT or MHC in the space provided, because the version on cms.gov has no box for either profession. CMS says a future update of the paper form will add both, PECOS already lists them, and CMS's forms page dates the form's revision May 1, 2023.

A licensed professional counselor enrolls as an MHC, since Medicare does not recognize LPC as a supplier type. CMS's Program Integrity Manual, chapter 10, applies the same rule to addiction counselors and alcohol and drug counselors who meet the MHC requirements, and CMS's FAQ extends it to anyone licensed under a different state title, such as LMHC, LCPC or LPCC, who meets every statutory and regulatory MHC qualification.

An MHC needs only a master's degree, where a clinical psychologist needs a doctorate in psychology. Clinical psychologists and clinical social workers file the same CMS-855I under boxes of their own in section 2H, and a practitioner with more than one non-physician specialty type files a separate CMS-855I for each.

What proof of supervised experience does the MAC accept?

The MAC accepts proof of supervised experience as a statement on the letterhead of the provider where the hours were worked, signed by the supervisor, an applicable department head or a current authorized or delegated official, or as a statement on the letterhead of the state licensing or credentialing body or a national MFT credentialing organization. CMS's manual sets that format in its MFT instructions, rules out email, and lets any official of a licensing body sign that body's statement.

The proof is owed only where licensure did not already require the experience: when a state requires it for a full license, CMS's FAQ says no additional document is needed, and the MAC validates the license and the experience during processing. Three limits apply to the count:

• Either 2 years or 3,000 hours meets the rule, and the manual says the supplier need not meet both.
• Years and hours from more than one provider can be combined.
• Pre-degree hours never count, even where the state counts them toward licensure, and a current employer cannot vouch for hours worked at other settings.

Missing documentation sends the file into development, and the MAC's letter gives 30 calendar days to respond; with no response, the application is rejected.

What else goes with the application, and who signs it?

The rest of a counselor's or MFT's Medicare file includes the copies of educational and certification information the CMS-855I asks for, the CMS-588 for electronic funds transfer, and a certification statement that only the practitioner may sign. First Coast, the MAC for Florida, Puerto Rico and the U.S. Virgin Islands, adds on its MFT enrollment page a copy of the state license when it is not verifiable online, and a certificate of completion, transcript or diploma if requested.

CMS requires payment by electronic funds transfer. First Coast lists the CMS-588 EFT agreement with a copy of a voided check or an account confirmation letter on bank letterhead, and says practitioners who reassign their benefits to another entity do not submit the CMS-588.

Only the enrolling practitioner can sign the PECOS application or the paper CMS-855I, and that authority cannot be delegated. The signature date can be no more than 120 days before the contractor receives the application. First Coast accepts a copy of the signature and refuses stamped signatures, on its MFT page and its mental health counselor page alike, and its MFT page accepts digital signatures such as DocuSign.

The MAC sends its questions to the optional contact person in section 13, who can be the practitioner or office or credentialing staff, or to the correspondence address in section 2 when section 13 is blank. Commercial insurers credential on paperwork of their own, covered in how to fax a W-9 and an ownership change to insurers for credentialing.

Can you fax enrollment paperwork to the MAC?

Enrollment paperwork goes to a MAC by fax only where CMS's manual allows it: a whole application goes by mail unless circumstances require fax or email, and a newly signed signature page that answers a development request on a paper application can go by scanned email, fax or mail. A full paper application sent by fax or email without the contractor's exception or CMS's authorization is a reason to develop it, and one faxed or emailed when the provider was not permitted to is a reason to reject it.

PECOS applications get their correspondence through PECOS, which the manual calls the PECOS Communication Vehicle (PCV). The contractor asks for a missing certification statement preferably through the PCV, email or fax, and a paper application's reply needs only the signature page. First Coast says a web application's certification statement can be uploaded as a signed and dated paper statement.

A paper CMS-855 can carry a handwritten ink signature or a digital or electronic one. Signing a returned page without a printer is covered in how to sign a fax and send it back, and the 30-day clock and each MAC's way of taking the reply are in how to answer a Medicare enrollment development request in 30 days.

A rejection letter, sent by fax, mail, the PCV or email, gives the reasons and how to reapply, no later than 5 business days after the contractor concludes the application should be rejected.

When can you start billing Medicare?

A counselor or MFT can bill Medicare from the effective date of billing privileges: the later of the date the practitioner filed an application that was later approved or the date services first began at a new practice location. The filing date is the date the contractor received the application, on paper or through PECOS, and the enrollment date, the approval date, cannot be made retroactive. Where circumstances precluded enrolling in advance, the manual allows billing for services up to 30 days before the effective date.

CMS says a clean web application is generally processed within 15 calendar days of receipt and a clean paper one within 30. The approval letter carries the PTAN, a Medicare-only number, and claims go out under the NPI.

Enrollment then runs to revalidation, about every five years: CMS posts due dates seven months ahead, the MAC sends a notice about three to four months before, and a late revalidation can bring a payment hold or deactivation of billing privileges.

How do groups, telehealth and more than one state change the paperwork?

Groups, telehealth and multistate practice each change a counselor's or MFT's CMS-855I: a group takes reassigned benefits through section 4F, a telehealth-only practice reports an administrative or telehealth location, and each state needs its own application. Reassignment lets the group submit claims and receive payment for the practitioner's Part B services, and it goes in PECOS or section 4F, since the CMS-855R is discontinued. On paper, a reassignment reported as a change uses the submittal reason "You are reporting a change to your Medicare enrollment information."

The practitioner signs section 15B and the group's authorized or delegated official signs section 15C, and both must be enrolled or enrolling at the same time, the group through PECOS or the CMS-855B. An owner who also treats files a CMS-855I while the group files the CMS-855B. A group that already bills for LCSW services keeps its PTAN when MFTs and MHCs join, and the MAC issues each newly enrolled MFT or MHC a PTAN linked to the group.

A counselor or MFT who furnishes telehealth only from a private practice selects the practice location type "Business Office for Administrative/Telehealth Use Only" or "Home Office for Administrative/Telehealth Use Only" on the paper CMS-855I, which keeps a home address off Care Compare. Telehealth claims report place of service code 02 or 10 beginning January 1, 2024, and the fax side of a remote practice is covered in fax for a telehealth practice with its own number.

A practitioner who treats in more than one state files a CMS-855I for each, with that state's license on it, and Medicare accepts a license from an interstate license compact pathway as a valid, full license.

What if you would rather opt out of Medicare?

A counselor or MFT who sees Medicare beneficiaries but does not want to enroll and submit claims is required to opt out, CMS says, and both professions are on the manual's list of practitioners who can. CMS has no standard opt-out form: some MACs post a template, and a practitioner can write an affidavit with the information the manual lists.

The initial affidavit is filed within 10 days after the practitioner signs the first private contract with a Medicare beneficiary, and the two-year period begins on the date the affidavit is signed. The opt-out renews automatically every 2 years unless the practitioner terminates it. The contractor asks only once for missing information and rejects the affidavit when no answer arrives within 30 days.

How do you handle enrollment paperwork from a HIPAA fax account?

On a paid Fax Pigeon plan, a MAC's faxed letter and the signed page that answers it travel on the practice's own number. The letter lands in one shared inbox, where the practitioner and the credentialing staff can see it and assign it, and adding people costs nothing. A signature page uploads as a PDF or a phone photo, and a cover sheet is optional. Each delivered reply gets delivery proof.

* Official sources (CMS, First Coast Service Options) were read on October 20, 2026. Fax Pigeon prices and plan terms as of October 21, 2026.