Medicare Enrollment for Mental Health Providers: PECOS, I&A, and What to Expect

Danielle Wagar
Jun 29
4 min read

By Danielle Wagar, CPES | Upstate Healthcare Admin

Medicare enrollment is one of the most misunderstood processes in mental health private practice. Providers avoid it because it feels complicated. They delay it because they do not know where to start. And then they refer out every Medicare client for years — clients who could have been seen in their practice. This guide breaks down exactly how Medicare enrollment works for mental health providers.

Who This Applies To

Medicare enrollment for mental health services applies to: Licensed Clinical Social Workers (LCSWs); Licensed Professional Counselors (LPCs) — added as eligible Medicare providers starting in 2024 under the Consolidated Appropriations Act; Licensed Marriage and Family Therapists (LMFTs) — also added in 2024; Psychologists (PhD, PsyD); Psychiatric Mental Health Nurse Practitioners (PMHNPs); and Psychiatrists and other physicians billing mental health services.

If you are an LCSW, LMFT, or LPC, the 2024 expansion of Medicare mental health access was significant. If you have been waiting, this is the time to move forward.

What Is PECOS?

PECOS stands for the Provider Enrollment, Chain, and Ownership System — the CMS online system used to enroll and manage Medicare provider enrollment records. You access PECOS through the CMS Enterprise Portal at pecos.cms.hhs.gov. Before you can use PECOS, you must complete the Identity and Access Management (I&A) process. Paper applications (CMS-855I or CMS-855B) take 60–90 days versus 30–60 days for PECOS.

Step 1: Complete the I&A Process

Before you can access PECOS, you must register through the CMS Enterprise Portal and complete Identity Verification.

Create a CMS Enterprise Portal account at portal.cms.gov — use your personal email address
Complete identity verification - you will need a government-issued photo ID
Request access to PECOS - CMS will confirm access within 1–3 business days
Associate your NPI with your account

Do not skip any step in the I&A process. Attempting to jump directly to PECOS without completing I&A is the most common reason providers report being unable to access the system.

Step 2: Gather Your Documentation

Before starting the PECOS application, gather:

Individual NPI (Type 1) and group NPI (Type 2) if applicable

Social Security Number or EIN

current professional license number and state of licensure

board certification information

DEA registration number (required for prescribers only)

practice address and all locations where you will see Medicare patients

banking information for Electronic Funds Transfer (EFT) - Medicare requires direct deposit; and a copy of your professional liability insurance certificate.

Step 3: Complete the PECOS Application

Choose Physician/Non-physician Practitioner for individual enrollment or Organizational Provider for group practices.

Reassignment vs. Independent Enrollment

If you are employed by or contracted with a group practice, you will likely submit a reassignment of benefits, allowing the group to bill Medicare on your behalf. Both you as an individual and the group must be separately enrolled in Medicare for reassignment to work.

Step 4: Submit and Wait for Your MAC

Once submitted, your application goes to your Medicare Administrative Contractor (MAC).

In New York and most of the northeast, the MAC is National Government Services. Processing times: new enrollments via PECOS 30–60 days; via paper 60–90 days; complex applications up to 90–120 days. Respond promptly to any development letters from your MAC - unanswered requests are the primary reason applications are rejected.

Step 5: Receive Your PTAN and Enroll in EFT

When approved, CMS will issue you a PTAN (Provider Transaction Access Number) — your Medicare provider number, required on all claims. You will also complete Electronic Funds Transfer (EFT) enrollment through your MAC's portal or via the CMS-588 form.

Retroactive Billing: The 30-Day Lookback Window

Once enrolled, you may be able to bill for services rendered up to 30 days before your effective enrollment date, provided you were otherwise eligible. Confirm with your MAC or a credentialing specialist before submitting retroactive claims.

Medicare Opt-Out: An Alternative Worth Understanding

Some mental health providers choose to opt out of Medicare rather than enroll. When you opt out, you enter into private contracts with each Medicare patient. Opt-out is a formal process - you must file an affidavit with your MAC and renew it every two years. For most providers building an insurance-based practice, enrollment is the better path.

Common Reasons Medicare Applications Stall or Are Rejected

NPI not active or not associated correctly in NPPES before PECOS enrollment
Licensing information mismatch - license number, state, and expiration date must match your licensing board exactly
Missing or expired malpractice certificate
Unanswered development requests from your MAC
EFT enrollment not completed

Medicare Advantage Is a Separate Enrollment

Enrolling in Traditional Medicare does NOT make you in-network with Medicare Advantage plans. Each plan requires a separate contracting process. For the full breakdown, see our post on Medicare Advantage vs. Traditional Medicare: What Behavioral Health Providers Need to Know.

If You Are Adding a New Location

Once enrolled, adding a new practice location to Medicare requires a PECOS change of information submission. For a full walkthrough of the location addition process across all payers, see our guide on adding a new office location to your insurance contracts.

Building your practice? See: The True Cost of Starting a Therapy Practice in 2026 | Choosing the Right Private Practice Model