Roles & billing
What Is a PTAN and How to Find Yours
By the NPI Portal editorial team Reviewed & updated Jul 10, 2026
There is no public PTAN lookup. If you searched for one, that is the first thing to know: unlike an NPI, a PTAN is not published in any directory, and no website (including this one) can look up someone else’s PTAN. The number is deliberately kept between a provider and their Medicare Administrative Contractor. What you can do is find your own, and this guide covers exactly where it lives.
What a PTAN is
A PTAN (Provider Transaction Access Number) is a Medicare-only number that a Medicare Administrative Contractor (MAC) assigns when a provider enrolls in Medicare. It is sometimes called a Medicare provider number, Medicare billing number, or Medicare legacy number, generic terms for the pre-NPI identifiers that Medicare contractors still use internally.
The PTAN’s job is authentication. When you call your MAC’s provider contact center or interactive voice response (IVR) line, log in to the MAC’s portal, or set up EDI transactions, the PTAN (usually together with your NPI and part of your tax ID) proves you are authorized to access that enrollment’s information.
PTAN vs NPI
The two numbers divide the work cleanly:
- The NPI is public, national, and goes on claims. Anyone can confirm one with an NPI lookup.
- The PTAN is private, Medicare-specific, and generally does not go on claims. Since the NPI became the standard claim identifier, MAC systems use the PTAN behind the scenes to match the NPI on a claim to the right Medicare enrollment.
A related asymmetry: a provider has exactly one NPI (a Type 1 for individuals, as explained in NPI Type 1 vs Type 2), but can hold multiple PTANs, typically one per enrollment, practice location, or MAC jurisdiction. A group that bills Medicare in two jurisdictions will have a PTAN with each MAC, all linked to the same NPI. For how the NPI relates to other identifiers more broadly, see NPI vs Tax ID vs DEA vs CLIA.
Where to find your PTAN
Three reliable sources, in the order most people try them:
- The MAC’s enrollment approval letter. When your enrollment was approved, the MAC mailed a letter containing your PTAN. If you keep credentialing files, it is in there.
- PECOS. Log in at pecos.cms.hhs.gov, open the relevant enrollment, and view the Medicare ID Report. Active PTANs appear in the Medicare ID column.
- Your MAC’s phone line. Call the provider contact center or IVR for your jurisdiction (Noridian, CGS, Palmetto GBA, or whichever MAC serves your region) and authenticate with your NPI and tax identification details.
If a colleague or billing service asks for the practice’s PTAN, it has to come from one of these sources; there is no registry shortcut.
When a PTAN stops working
MACs deactivate a PTAN when a provider has not billed Medicare for four consecutive quarters. If your PTAN no longer authenticates, contact your MAC’s enrollment department: reactivation goes through the enrollment process, not through a lookup.
NPI Portal is an independent tool built on public CMS data. NPI records are public and searchable here; PTANs are not part of any public dataset, which is why no PTAN search exists on this site or any other.