Medicare PECOS Enrollment Services for Physicians & Healthcare Organizations
What Is Medicare PECOS Enrollment?
Medicare enrollment is the process by which physicians, nurse practitioners, physician assistants, and healthcare organizations apply to participate in the Medicare program so they can bill the Centers for Medicare & Medicaid Services (CMS) for services rendered to Medicare beneficiaries. Enrollment is completed through the Provider Enrollment, Chain, and Ownership System (PECOS), CMS's online portal, using the appropriate CMS-855 application form.
There are three primary CMS-855 forms: CMS-855I for individual providers, CMS-855B for group practices and organizations, and CMS-855R to reassign an individual provider's billing rights to a group entity. Upon approval, CMS assigns a PTAN (Provider Transaction Access Number) — the unique identifier required on every Medicare claim. Without a PTAN, no Medicare claim can be submitted regardless of the provider's qualifications or the patient's coverage.
Medicare enrollment is also the prerequisite for Medicare Advantage plan credentialing — providers cannot enroll with Humana MA, UnitedHealthcare MA, Aetna MA, or any other Medicare Advantage plan without first having an active PECOS enrollment. This makes Medicare enrollment the foundational step in most providers' payer enrollment strategy.
Our 6-Step Medicare Enrollment Process
Step 1: Medicare Eligibility & Document Audit (Days 1–3) — We verify your eligibility for Medicare enrollment, confirm your NPI is active and correctly typed (Type 1 individual, Type 2 organizational), audit your medical license and DEA for state-specific requirements, and review your malpractice insurance for CMS's minimum coverage standards. Any gaps are flagged and resolved before application submission.
Step 2: CMS-855 Form Preparation (Days 2–5) — We prepare the correct CMS-855 form set for your situation: 855I for individual enrollment, 855B for group enrollment, and 855R for reassignment. Each form requires precise data about practice locations (including CMS Certification Numbers for facility-based providers), ownership structures, managing employees, adverse history, and existing Medicare participation. Errors on CMS-855 forms are the #1 cause of Medicare enrollment delays.
Step 3: PECOS Submission to Your MAC (Days 5–7) — Applications are submitted through PECOS to your regional Medicare Administrative Contractor (MAC). ProEnrollment maintains current contact and processing-pattern data for every MAC jurisdiction — Novitas, First Coast, Palmetto, CGS, WPS, NGS, and Noridian — and submits to the correct entity with no routing delays.
Step 4: I&A (Identity & Authentication) Completion (Days 7–14) — After PECOS submission, CMS requires Identity & Authentication (I&A) verification for the authorized signatory. This is a common stall point — the I&A notice can be easy to miss, and failure to complete it within the required timeframe pauses the application. We track I&A status and guide your signatory through completion.
Step 5: MAC Follow-Up & Deficiency Response (Weeks 2–8) — We contact your MAC weekly to check application status. When development requests (deficiency letters) arrive, we respond within 24 hours with corrected information. MAC development requests have strict response deadlines; missing one resets your application to the back of the queue.
Step 6: PTAN Assignment & Billing Activation (Weeks 6–12) — Upon approval, we confirm your PTAN assignment, verify your effective date (which can be retroactive up to 30 days before application receipt), set up ERA/EFT with Medicare, and confirm your listing in Medicare's Provider Enrollment & Certification database. Your billing team receives a complete activation packet.
Medicare Enrollment Benefits
- 45–90 day average processing — complete applications with pre-audited documents prevent the 120+ day timelines common with DIY filing
- Retroactive effective dates — early submission maximizes the 30-day retroactive window, capturing revenue from day one
- MAC-specific expertise — we know each MAC's processing patterns, contact paths, and common development request triggers
- I&A tracking — the identity verification step that stalls most self-filed applications is tracked and guided through completion
- Revalidation management — we track your revalidation cycle and complete it 90 days ahead of deadline
- Medicare Advantage sequencing — PECOS enrollment is completed first, then MA plan credentialing begins immediately
- Group and reassignment handling — 855B + 855I + 855R filed together so your group can bill from day one
- DMEPOS and ancillary enrollment — CMS-855S for DME suppliers with accreditation and bond coordination
Compliance and Regulatory Framework
Medicare enrollment operates under strict CMS regulatory requirements:
- 42 CFR Part 424 — governs Medicare provider enrollment conditions, including screening levels (limited, moderate, high) based on provider type and risk
- Revalidation cycles — most providers revalidate every 5 years; DMEPOS suppliers every 3 years; failure to revalidate triggers deactivation
- Reporting requirements — changes to practice location, ownership, adverse actions, or managing employees must be reported to PECOS within 30–90 days depending on the change type
- OIG exclusion check — providers on the OIG exclusion list cannot enroll in Medicare; we verify exclusion status at intake
- NPDB query — CMS queries the National Practitioner Data Bank during enrollment; undisclosed malpractice history causes denials
CMS-855 Form Breakdown — Which Form Do You Need?
Medicare enrollment runs entirely on CMS-855 forms, and using the wrong one is a top cause of processing delays. Here is exactly which form applies to your situation:
| Form | Full Name | Who Files It | When You Need It |
|---|---|---|---|
| CMS-855I | Medicare Enrollment Application — Physicians and Non-Physician Practitioners | Individual providers (MD, DO, NP, PA, therapists, etc.) | Every individual practitioner billing Medicare, including those joining an existing group |
| CMS-855B | Medicare Enrollment Application — Clinics/Group Practices and Certain Other Suppliers | The practice or organization (Type 2 NPI) | New group practices, clinics, and organizational suppliers enrolling as an entity |
| CMS-855R | Medicare Enrollment Application — Reassignment of Medicare Benefits | Individual provider + the group they're joining (signed by both) | Whenever an individually-enrolled provider reassigns billing rights to a group practice |
| CMS-855A | Medicare Enrollment Application — Institutional Providers | Hospitals, SNFs, home health agencies, hospices | Institutional providers only — not applicable to physician practices |
Most new physicians joining a group practice need both 855I and 855R filed together — the 855I enrolls the individual, the 855R reassigns their billing rights to the group's Type 2 NPI. New group practices forming for the first time need 855B filed alongside each individual provider's 855I. ProEnrollment identifies the correct form combination for your situation before any application is submitted, preventing the follow-up correction requests that add 4-8 weeks to a mismatched filing.
Medicare Enrollment Timeline by MAC Jurisdiction
| MAC (Jurisdiction) | States Covered | Typical Processing |
|---|---|---|
| First Coast Service Options (N) | FL, PR, VI | 45–75 days |
| Novitas Solutions (H & L) | PA, NJ, DE, MD, DC + AR, CO, LA, MS, NM, OK, TX | 45–80 days |
| Palmetto GBA (J & M) | NC, SC, VA, WV + AL, GA, TN | 60–90 days |
| CGS Administrators (15) | KY, OH | 55–85 days |
| WPS Government Health Administrators (5 & 8) | IA, KS, MO, NE, MN, ND, SD, WI + MI, IN | 50–80 days |
| NGS (6) | IL, MN, WI (shared) | 50–80 days |
| Noridian Healthcare Solutions (E & F) | AK, AZ, ID, MT, NV, ND, OR, SD, UT, WA, WY + CA, HI, NV, AS, GU, CNMI | 55–90 days |
Common Medicare Enrollment Mistakes
- Wrong CMS-855 form — filing 855I when you also need 855B and 855R for group billing; claims deny until the group enrollment is approved
- Missing I&A completion — the Identity & Authentication step is easy to overlook; failure to complete it stalls the entire application
- Incorrect practice location data — PECOS requires exact addresses matching your state license; discrepancies trigger development requests
- Not reporting changes — moving offices, adding providers, or changing ownership without updating PECOS can trigger revocation
- Missed revalidation — CMS deactivates billing privileges without warning when revalidation is overdue
- Delayed application — every day of delay narrows the 30-day retroactive effective date window
Related Services
- Payor Credentialing Services — full commercial payer enrollment
- Medicaid Enrollment — state Medicaid and MCO enrollment in all 50 states
- CAQH ProView Management — profile setup and attestation
- Re-Credentialing & Revalidation — proactive renewal management
- DME/DMEPOS Enrollment — CMS-855S with accreditation coordination
- New Practice Credentialing — NPI, PECOS, and payer enrollment from entity formation
Frequently Asked Questions
What is Medicare PECOS enrollment?
PECOS (Provider Enrollment, Chain, and Ownership System) is CMS's online portal for Medicare provider enrollment. Every physician, group practice, and healthcare organization that wants to bill Medicare must enroll through PECOS using the appropriate CMS-855 form: CMS-855I for individual providers, CMS-855B for group practices and organizations, and CMS-855R to reassign billing rights from an individual to a group. Enrollment results in a PTAN (Provider Transaction Access Number) that is required to submit Medicare claims.
How long does Medicare enrollment take?
Medicare PECOS enrollment typically takes 45–90 days from submission to approval, depending on your regional MAC (Medicare Administrative Contractor). Some MACs process faster than others — First Coast Service Options and Novitas Solutions tend toward the shorter end, while Palmetto GBA and CGS Administrators can run longer. ProEnrollment submits complete, pre-audited applications and follows up with the MAC weekly to prevent stalls. Deficiency responses are returned within 24 hours.
What is the difference between CMS-855I, CMS-855B, and CMS-855R?
CMS-855I enrolls an individual provider (physician, NP, PA) in Medicare. CMS-855B enrolls a group practice or organization. CMS-855R reassigns an individual's billing rights to a group, allowing the group to bill Medicare for that provider's services. Most providers need both an 855I and an 855R filed together. A new group practice needs an 855B (to establish the group), 855I (for each provider), and 855R (to link each provider to the group).
What is a PTAN and why do I need one?
A PTAN (Provider Transaction Access Number) is the unique identifier Medicare assigns when your enrollment is approved. Your PTAN is required on every Medicare claim — without it, claims cannot be submitted. It is different from your NPI; the NPI is your universal provider identifier, while the PTAN is Medicare-specific. ProEnrollment confirms your PTAN assignment and effective date in writing as part of every Medicare engagement.
What is Medicare revalidation?
Medicare revalidation is CMS's periodic re-enrollment requirement, typically every 5 years (3 years for DMEPOS suppliers). During revalidation, you must re-verify all your enrollment information through PECOS. Failure to complete revalidation by the deadline results in deactivation of your Medicare billing privileges — claims will deny. ProEnrollment tracks revalidation cycles and initiates the process 90 days ahead of your deadline.
Can I backdate my Medicare effective date?
Medicare allows a retroactive effective date up to 30 days before the date CMS receives your application, provided you had a valid opt-out or were not previously enrolled. This means submitting your application as early as possible protects revenue by pulling the effective date back. ProEnrollment files applications immediately after document collection to maximize the retroactive window.
What is a MAC and which one covers my state?
A MAC (Medicare Administrative Contractor) is the regional entity that processes Medicare claims and enrollment applications for a specific geographic jurisdiction. There are currently 7 A/B MACs covering different states. For example, Novitas Solutions covers Jurisdiction H (multiple mid-Atlantic states), while First Coast Service Options covers Jurisdiction N (Florida and other southeastern states). ProEnrollment knows each MAC's processing patterns and contacts.
Do I need Medicare enrollment before Medicare Advantage?
Yes. Active Medicare PECOS enrollment is a prerequisite for Medicare Advantage plan credentialing. If you want to see patients with Humana Medicare Advantage, UnitedHealthcare Medicare Advantage, or Aetna Medicare Advantage, you must first have an approved Medicare PECOS enrollment with a valid PTAN. ProEnrollment sequences these correctly — PECOS first, then Medicare Advantage plans.
Start Your Credentialing Today
Every week without payer enrollment is a week of lost revenue. ProEnrollment's specialists have credentialed 500+ providers with a 99.4% first-time approval rate across all 50 states. Schedule your free credentialing assessment or call (945) 307-6616 to speak with a specialist in 30 seconds.
ProEnrollment LLC
2310 North Henderson Ave, Ste B #1546, Dallas, TX 75206
Phone: (945) 307-6616 · Email: info@proenrollment.com