What Is a PTAN? Medicare's Provider Transaction Access Number Explained
A PTAN (Provider Transaction Access Number) is a Medicare-only identifier issued by your Medicare Administrative Contractor (MAC) when your Medicare enrollment is approved. It is also called a Medicare Provider Number, Medicare Billing Number, CMS Certification Number (CCN), or Medicare "legacy" number. Unlike your NPI, a PTAN is not submitted on claims and is not publicly available. It is used exclusively to authenticate your identity when communicating with your MAC.[1]
If you have ever called your MAC about a claims issue, you already know what a PTAN is: it is the first thing the representative asks for. But many providers, especially those new to Medicare billing, have their PTAN on a letter somewhere and are not sure what it is, where it came from, or why it is different from their NPI. This guide covers all of that in plain language.
What a PTAN Is and Its Other Names
The Provider Transaction Access Number is a Medicare-only number issued to providers and suppliers by their MAC upon approval of a Medicare enrollment application. The MAC sends an approval letter that includes the PTAN when enrollment is finalized.[1]
The PTAN goes by several different names depending on which MAC you deal with or which CMS document you are reading. All of the following refer to the same identifier:
- Medicare Provider Number
- Medicare Billing Number
- CMS Certification Number (CCN)
- Medicare "legacy" number
- Medicare ID (the label used in the PECOS interface)
Regardless of which label appears on your paperwork, they all mean the same thing: the number your MAC assigned when it approved your enrollment.
The CMS-855A Medicare enrollment application for institutional providers defines PTAN as "Provider Transaction Access Number also referred to as the Medicare Identification Number." This is the most precise official definition of the term.[3]
PTAN vs. NPI: Key Differences
The PTAN and the NPI are both required for Medicare billing, but they serve entirely different functions and come from entirely different places. Confusing them is one of the most common sources of billing and credentialing errors.
| Feature | NPI | PTAN |
|---|---|---|
| Issuing authority | NPPES (federal, run by CMS) | Your regional MAC |
| Submitted on claims | Yes, required on all HIPAA claims | No, never appears on claims |
| Publicly available | Yes, searchable in the public NPI registry | No, private and not publicly disclosed |
| Program scope | All payers, all programs (HIPAA-wide) | Medicare only |
| How it is obtained | Apply through NPPES before enrolling in Medicare | Assigned automatically by MAC when enrollment is approved |
| Permanence | Permanent; never expires or changes | Can be deactivated; provider may have multiple |
| Primary use | Identify provider on claims and administrative transactions | Authenticate provider identity when contacting MAC |
CMS requires providers to obtain an NPI before enrolling in Medicare. The PTAN cannot exist without a prior NPI. It is issued as part of the Medicare enrollment process, which itself requires a valid NPI. Applying for an NPI is a completely separate process from Medicare enrollment.[2]
All Provider Identifiers Compared
Medicare billing involves several provider identifiers that are easily confused. The table below maps each one by visibility, program scope, and primary use, so billers and credentialing staff can quickly identify which number belongs in which context.
| Identifier | Issued by | On claims | Visibility | Primary use |
|---|---|---|---|---|
| NPI | NPPES / CMS | Yes | Public | Universal provider ID on all HIPAA transactions |
| PTAN | Your MAC | No | Private | Medicare MAC authentication and correspondence |
| TIN / EIN | IRS | No (PECOS only) | Private | Tax identification; links NPI to PECOS enrollment |
| DEA Number | DEA (DOJ) | Sometimes | Private | Prescribing controlled substances |
| State License | State board | No | Public | Practice authority within a state |
| CLIA Number | CMS / State | Sometimes | Semi-public | Laboratory certification identification |
Part A PTAN Structure
Medicare Part A providers and suppliers receive a six-digit PTAN with a specific structure. Understanding the format helps billing staff identify Part A PTANs in their records:[1]
State code
Facility type and sequence within the CCN range
Part B PTANs and supplier PTANs do not follow this same six-digit format. Their structure varies by MAC and provider type. If you are unsure whether a number in your records is a PTAN, cross-reference it with the MAC letter you received when your enrollment was approved, or verify it through PECOS.
How to Find Your PTAN
There are two official ways to locate your PTAN. There is no public PTAN lookup tool. It can only be found through your own records or your PECOS account.[2]
Option 1: Your MAC Approval Letter
When your Medicare enrollment was approved, your MAC sent a notification or approval letter. That letter includes your PTAN. If you still have it, that is the fastest reference. If you do not have the letter, contact your MAC and they can send a replacement after verifying your identity.
Option 2: PECOS (most reliable)
PECOS is the most efficient way to locate your current PTAN, especially if you have multiple enrollments or are unsure which PTAN applies to which location. Follow these steps after logging in at pecos.cms.hhs.gov:[2]
Log in to PECOS using your I&A System credentials.
Select My Associates on the PECOS home page.
Select View Enrollments for the applicable individual or organizational enrollment.
Click View Medicare ID Report.
Your PTAN or PTANs are listed in the Medicare ID column.
Providers with enrollments at multiple practice locations may have separate PTANs for each location. The Medicare ID Report in PECOS will list all active PTANs associated with your account, so you can identify which applies to which location.
PTAN for MAC Authentication
The PTAN's primary operational role is identity verification when contacting your MAC. CMS requires MACs to authenticate callers using three data elements before releasing any claim or enrollment information:[4]
- NPI
- PTAN
- Last five digits of your Tax Identification Number (TIN)
This three-part authentication applies both to live calls with Customer Service Representatives (CSRs) and to automated Interactive Voice Response (IVR) systems. MACs have the discretion to request your provider name as a fourth element when needed to identify a specific claim or beneficiary.
The same three elements are required for MAC portal access and written correspondence. Keep your PTAN secure and available alongside your NPI and TIN so you can complete authentication quickly when you need to reach your MAC.
Multiple PTANs for Multiple Locations
A MAC may issue more than one PTAN when a provider has practice locations in different Medicare reasonable charge localities. However, this is the only circumstance under which an additional PTAN is assigned. If your practice locations all fall within the same reasonable charge locality, a single PTAN covers all of them.[1]
When a provider joins a new group or opens a new location that crosses a locality boundary, the new enrollment application through PECOS will result in a new PTAN being assigned by the MAC. Providers should use the PECOS Medicare ID Report described above to keep track of all active PTANs.
PTAN Deactivation
CMS requires MACs to deactivate PTANs that have not been used to bill Medicare for four consecutive quarters. The deactivation process runs monthly. When a PTAN is deactivated, it is assigned an end date. Claims for services provided before the end date can still be submitted within one year of the service date, but no new claims can be submitted under the deactivated PTAN after that point.[1]
A deactivated PTAN means your Medicare billing number has lapsed from inactivity. It does not mean your PECOS enrollment was revoked for a compliance reason, which is a different and more serious action. If your PTAN is deactivated due to inactivity, you need to re-enroll in Medicare through your MAC to receive a new PTAN. Contact your MAC to confirm the reason for any deactivation before submitting a new enrollment application.
Providers Not Eligible for a PTAN
Not all providers qualify for Medicare enrollment and therefore will not be issued a PTAN. If a provider is ineligible, requests for a "denial only letter" from the MAC are no longer accepted under current CMS policy. In those situations, if a Medicare beneficiary still wishes to seek reimbursement for services rendered by an ineligible provider, the beneficiary must submit the CMS-1490S Patient's Request for Medical Payment form directly to Medicare.[1]
Frequently Asked Questions
PTAN basicsNo. PTANs are private Medicare identifiers that are not publicly disclosed. Unlike NPIs, which are published in the NPPES public registry and searchable here on NPI Profile, PTANs are only accessible to the enrolled provider through PECOS or through their MAC. There is no public PTAN lookup tool, and NPI Profile does not display PTAN information on provider profiles.
In common usage, yes. When someone refers to a "Medicare number," "Medicare Provider Number," or "Medicare Billing Number" in the context of a provider (not a beneficiary), they are almost always referring to a PTAN. These terms are used interchangeably across different MACs and CMS documents. The PTAN is the formal CMS term for this identifier.
By design. The NPI is the only provider identifier required on Medicare claims. CMS and HIPAA replaced the legacy billing number system with the NPI for claims specifically so that one universal identifier could work across all payers and programs. The PTAN was retained for MAC authentication purposes only, where its private nature is actually an advantage. Putting it on claims would expose it publicly, undermining its security value.
Yes. PTANs are issued by a specific MAC and are tied to that MAC's jurisdiction. If your practice relocates to a different MAC's geographic coverage area, you must update your PECOS enrollment record with the new practice address, and the new MAC will issue you a new PTAN. Your NPI does not change in this process; only the PTAN changes because it is MAC-specific.
Contact your MAC to confirm the deactivation reason. If it was deactivated for inactivity (no claims submitted for four consecutive quarters), you will need to submit a new Medicare enrollment application through PECOS. Your MAC will issue a new PTAN upon approval. In the meantime, you can still submit claims for services provided before the deactivation end date, within one year of the service date.
No. NPI Profile publishes data from the NPPES public release and from CMS's public PECOS enrollment datasets. PTANs are private Medicare identifiers that are not included in any public CMS data release, so they do not appear on NPI Profile provider profiles. To find a PTAN, log into PECOS directly or contact your MAC.
Look up a provider's NPI and Medicare enrollment status.NPI Profile shows PECOS enrollment, participation status, and ordering and referring eligibility, all sourced from public CMS data.
PECOS LookupSources
This guide is based on the following official government publications. NPI Profile summarizes official documentation for convenience; the source documents remain the authoritative reference.
- Noridian Medicare (Jurisdiction F Part B). Provider Transaction Access Number (PTAN). med.noridianmedicare.com, last updated October 15, 2025. Covering PTAN definition, the NPI-PTAN relationship, multiple PTANs, deactivation policy, ineligible PTAN requests, and PECOS lookup steps.
- Palmetto GBA (Jurisdiction M and JJ Part B). Provider Transaction Access Number Guidance. palmettogba.com, published July 1, 2025. Covering PTAN aliases (Medicare Provider Number, Medicare Billing Number, CCN, legacy number), authentication requirements, multiple PTANs, deactivation, and the two-method PTAN lookup process.
- Centers for Medicare & Medicaid Services. CMS-855A Medicare Enrollment Application (revised 09/24). Acronyms section: "PTAN: Provider Transaction Access Number also referred to as the Medicare Identification Number."
- Centers for Medicare & Medicaid Services. Medicare Program Integrity Manual, Chapter 30 and Chapter 80, Revision 25 (R25COM.pdf). Section 30.2.1 and 80.2.1: CSR and IVR telephone inquiry authentication using NPI, PTAN, and last five digits of TIN.
