Credentialing and enrollment are two different steps
Credentialing is a payer’s (or hospital’s) review of a clinician’s qualifications: education, training, licenses, board status, malpractice history and work history. Enrollment is getting the clinician set up to bill that payer under the right practice, tax ID and location, and, for commercial plans, signing or joining the participation contract. A clinician can be credentialed and still not be able to bill if enrollment is incomplete — which is why claims are denied for “provider not enrolled” even when the paperwork seemed done.
What each payer type requires
| Payer | Where enrollment happens | What to watch |
|---|---|---|
| Medicare | PECOS (online) or CMS-855 forms, processed by your Medicare Administrative Contractor | Reassignment of benefits to the group, effective dates, revalidation roughly every five years |
| Medicaid | Each state’s Medicaid program, plus each Medicaid managed care plan | Separate rules and timelines by state and by plan |
| Commercial plans | Plan applications, usually using the clinician’s CAQH ProView profile | Network status, contract terms, fee schedule and effective date |
Why timing matters so much
Credentialing with a commercial plan commonly takes several months, and claims for services before the effective date may be paid out of network or not at all. Medicare allows limited retroactive billing from the effective date it assigns, but only for services after that date. The practical answer is to start enrollment as soon as a new clinician signs, track every application weekly, and hold or route claims correctly until each payer is active. We keep a live tracker per clinician and payer so the billing team always knows what can be billed and where.
Keeping enrollments current
- CAQH ProView re-attestation is due regularly; a lapsed attestation can stall applications and recredentialing.
- Medicare revalidation dates are published by CMS; missing one can deactivate billing privileges.
- Changes — a new location, tax ID, ownership or a clinician leaving — must be reported to payers, or claims are denied or misdirected.
- License and certificate expirations (state license, DEA, board certification, malpractice) are tracked with reminders.
How credentialing connects to billing
Enrollment errors show up later as denials that look like billing problems. When credentialing sits inside a revenue cycle management engagement, those denials are traced back to the enrollment record and fixed there. For multi-location organizations, see how this works for medical groups; for new or small practices, see independent practices.