Enrolling in Medicare means enrolling directly with CMS through PECOS, not applying to a commercial insurer, and the process runs on a different track from Aetna, Humana or any other payer's credentialing. CMS sets a tiered contractor timeliness standard rather than one flat number. For a complete online PECOS application that does not require a site visit, contractors must process 95 percent within 15 calendar days and 100 percent within 50 calendar days. The equivalent paper CMS-855 application is slower: 80 percent within 60 days, 90 percent within 120 days. An application that triggers a mandatory site visit is slower still: 80 percent within 80 days, 90 percent within 90 days, 95 percent within 120 days.
Once enrolled, most providers and suppliers must revalidate every 5 years; durable medical equipment, prosthetics, orthotics and supplies (DMEPOS) suppliers revalidate every 3 years. CMS posts each provider's specific due date on its public Medicare Revalidation List roughly 7 months in advance, and your Medicare Administrative Contractor sends a notice by mail or email about 3 to 4 months before that date. CMS does not grant extensions, so missing the window risks a payment hold or deactivation of billing privileges.
How long does Medicare enrollment through PECOS take?
CMS sets a tiered contractor timeliness standard, not one flat number, and it differs by submission method and whether a site visit is required. For a complete online PECOS application with no site visit, CMS's own transmittal requires contractors to process 95 percent within 15 calendar days and 100 percent within 50 calendar days of receipt.
The equivalent paper CMS-855 application runs on a slower standard: 80 percent processed within 60 days, 90 percent within 120 days. Applications that trigger a mandatory site visit are slower again: 80 percent within 80 days, 90 percent within 90 days, 95 percent within 120 days. Submitting online, with a complete file, is the single biggest lever you control over your own timeline.
What is PECOS, and do I have to use it?
PECOS is CMS's own online system for Medicare provider and supplier enrollment, and it is the method CMS itself holds to the fastest contractor timeliness standard. It lets you review what CMS already has on file, upload supporting documents, and sign and submit electronically, which is also why its standard is faster than paper.
| Application type | CMS contractor timeliness standard |
|---|---|
| Online PECOS, no site visit | 95% within 15 days, 100% within 50 days |
| Paper CMS-855, no site visit | 80% within 60 days, 90% within 120 days |
| Any application requiring a site visit | 80% within 80 days, 90% within 90 days, 95% within 120 days |
| Revalidation, most providers and suppliers | Every 5 years |
| Revalidation, DMEPOS suppliers | Every 3 years |
Medicare enrollment is separate from commercial credentialing. A clean PECOS enrollment does not automatically credential you with Aetna, Humana or any other commercial payer, and vice versa; each process runs independently and needs to be tracked on its own timeline. See how long credentialing actually takes for how Medicare's timeline compares to commercial payers.
How do I actually enroll through PECOS?
Get or confirm your NPI
A National Provider Identifier is required before you can enroll; most clinicians need only a Type 1 individual NPI.
Complete the online PECOS application
Enter practice location, licence, and reassignment of benefits information as applicable; CMS's own system lets you review what is already on file.
Sign and submit electronically
PECOS supports electronic signature, which avoids the mailing delay a paper CMS-855 form adds and is held to the faster 15-to-50-day standard.
Site visit, if required
Some provider and supplier types trigger a mandatory site visit before approval; this moves your application onto the slower 80-to-120-day standard.
Approval and effective date
Once approved, your Medicare Administrative Contractor confirms your enrollment and billing effective date.
How does Medicare revalidation work?
Most providers and suppliers revalidate every 5 years; DMEPOS suppliers revalidate every 3 years. CMS posts specific due dates on its public Medicare Revalidation List about 7 months ahead, and your Medicare Administrative Contractor separately sends a notice by mail or email roughly 3 to 4 months before the due date.
CMS does not grant extensions on revalidation. Missing the due date can result in a hold on Medicare reimbursement or deactivation of your billing privileges, so check the public due-date list directly rather than waiting solely on the mailed notice to arrive.
Use PECOS, not paper
CMS's own contractor standard targets 95% of online applications within 15 days, versus 80% within 60 days for paper; electronic signature removes a mailing step entirely.
A site visit resets your clock
If your provider or supplier type requires one, the applicable standard jumps to 80 to 120 days regardless of submission method.
Track Medicare and commercial separately
PECOS enrollment and commercial payer credentialing are independent processes on independent clocks.
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Juney Ham is the founder and CEO of Telesure, the marketplace that matches clinicians with independent licensing and credentialing specialists. Previously co-founder of Upside and CMO at Hired. Every regulatory figure on this page is taken from the issuing state board, compact commission or CMS and was verified on 7 October 2026. Fees and compact status change; confirm with the relevant board before relying on them.
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