Is a PTAN the same as an NPI?

No. The NPI is the national identifier issued through NPPES, and it is the number that goes on Medicare claims. The PTAN is a Medicare-only number your MAC assigns when it approves an enrollment, and CMS told MACs to have providers use it to identify themselves on inquiries such as calls to the MAC's interactive voice response system.

What Is a PTAN in Medical Billing?

Provider Transaction Access Number (PTAN)

Short answer

A Provider Transaction Access Number (PTAN) is the Medicare identification number that a Medicare Administrative Contractor assigns to an enrolled practitioner, group or supplier, separate from the National Provider Identifier that goes on claims.

Last reviewed October 30, 2026 by the Remitwright billing team. Editorial policy

Also written asPTANPTANsProvider Transaction Access Number

Medicare enrollment leaves you with two identifiers that are easy to confuse. The NPI comes from NPPES, belongs to you everywhere, and has to exist before Medicare will enroll you. The PTAN comes later, from your MAC, once the enrollment is approved. Both enrollment applications describe the PTAN, which people also call a Medicare billing number or Medicare identification number, as a generic term for any number other than the NPI that a practitioner or supplier uses to bill Medicare^1,2.

In day-to-day work the NPI does the billing and the PTAN does the identifying. When CMS added the NPI to enrollment approval letters, it told contractors to list every PTAN issued, including PTANs assigned to group members, to tell suppliers to put the NPI on all claims, and to have them use the PTAN as their identifier when making inquiries through the MAC’s interactive voice response system³.

A provider can hold more than one PTAN. The CMS-855I has PTAN fields for the practitioner, for the group receiving a reassignment and for each practice location¹. That is where mistakes start: quoting the wrong PTAN on a change request or a revalidation points the MAC at the wrong enrollment. Keep a table of each NPI and PTAN pair by group and location. The number is also personal. By signing the CMS-855I, a practitioner certifies that their PTAN may be used only by them, or by the enrolled provider or supplier to whom they have reassigned benefits, when billing for their own services¹.

Example

Provider Transaction Access Number (PTAN) in practice

A nurse practitioner joins a group and reassigns her benefits to it. The MAC's approval letter lists her NPI and the PTAN assigned for her work at the group, and the biller records the pair in the practice's enrollment file so the team can use them when checking claim status through the MAC's phone system. Hypothetical example.

Provider Transaction Access Number (PTAN)

Provider Transaction Access Number (PTAN) in practice

A provider transaction access number (PTAN) is part of payer enrollment, one of the services a dedicated biller runs for you.

Questions about a provider transaction access number (PTAN)