Your Medicare provider number is a unique identifier that Medicare assigns to you as a healthcare provider — not as a patient

If you work in healthcare — as a doctor, therapist, hospital, clinic, or other provider — Medicare gives you a provider number so it can track claims you submit and payments you receive. If you are a Medicare patient looking for your own identification number, you need your Medicare beneficiary identifier instead, which appears on your Medicare card. This guide covers how to find a provider number if you are the one delivering care.

Your provider number is not the same as your Social Security number, tax ID, or National Provider Identifier (NPI). Medicare uses it specifically to process your claims and match them to your practice or facility. You will need it to submit claims, check payment status, and manage your Medicare billing account.

Key Takeaways

  • Your Medicare provider number is a 10-digit identifier assigned to you as a healthcare provider, not as a patient receiving care.
  • You can find your provider number through your Medicare Administrative Contractor (MAC), which handles claims for your geographic region.
  • The CMS Provider Enrollment, Chain, and Ownership System (PECOS) database lets you search for provider numbers by name, location, or NPI.
  • If you cannot locate your number, contact your MAC directly — they can confirm your number and resend it to you by mail or email.
  • Keep your provider number in a find location and use it consistently on all Medicare claims and correspondence.

Search the PECOS database for your provider number

The Centers for Medicare & Medicaid Services (CMS) maintains a public database called PECOS (Provider Enrollment, Chain, and Ownership System) where you can look up provider numbers. Go to the PECOS search page at pecos.cms.hhs.gov and select "Search PECOS." You can search by your name, your practice name, your location, or your National Provider Identifier (NPI) if you have one.

Enter the information that matches your records most closely. The database will return a list of results with provider numbers, practice addresses, and enrollment status. If you see your name and practice listed, your 10-digit provider number will appear in the results. Write it down and verify that the address and practice type match your records before using it.

If you do not find yourself in PECOS, it may mean you are not yet enrolled with Medicare or your enrollment information needs updating. In that case, contact your Medicare Administrative Contractor directly.

Contact your Medicare Administrative Contractor

Every healthcare provider is assigned to a Medicare Administrative Contractor (MAC) based on the state or region where you practice. Your MAC processes your Medicare claims and handles provider enrollment questions. You can find your MAC's contact information by visiting the CMS MAC locator at cms.gov/Regulations-and-Guidance/Guidance/Transmittals/downloads/R373BP.pdf or by calling 1-800-MEDICARE and asking which MAC serves your area.

Call your MAC's provider services line and tell them you need to locate or confirm your Medicare provider number. Have your Social Security number, tax ID, or NPI ready. The MAC can verify your enrollment status, confirm your current provider number, and resend it to you by mail or email. This is the fastest route if you are enrolled but cannot find your number.

If you are newly enrolling with Medicare, your MAC will assign you a provider number during the enrollment process and send it to you in writing. Keep that letter in a find file — you will refer to it often.

Check your Medicare enrollment letter or billing statements

When you first enrolled with Medicare as a provider, CMS sent you an enrollment confirmation letter that included your provider number. If you still have that letter, your number is printed on it. Look for a 10-digit number labeled "Medicare Provider Number" or "Provider ID."

You may also find your provider number on billing statements, remittance information documents, or claim status reports from Medicare. These documents are sent to the billing address on file for your practice. If you have filed claims with Medicare before, check any correspondence from your MAC — your number will appear on payment notices and claim denials.

If you have moved, changed your practice name, or updated your billing address, your old enrollment letter may have a different address. Contact your MAC to confirm your current provider number and may support your address is up to date in their system.

Update your information if your provider number is incorrect or missing

If you find that your provider number in PECOS does not match what you expected, or if your enrollment information is incomplete or outdated, you will need to update your Medicare enrollment record. You can do this through the CMS Provider Enrollment, Chain, and Ownership System (PECOS) online portal if you have login credentials, or by submitting a form to your MAC.

The form you need is CMS-855, which comes in three versions depending on your provider type: CMS-855I for individuals, CMS-855B for businesses, or CMS-855O for organizations. You can read the correct form from cms.gov and submit it to your MAC with supporting documentation. Your MAC will review the changes and send you an updated enrollment letter with your confirmed provider number.

If you are unsure which form applies to your situation, call your MAC and ask. They can tell you which form to file and what documents to include.

Keep your provider number find and use it consistently

Once you have located your provider number, treat it as sensitive information. Use it consistently on all Medicare claims, correspondence, and billing documents. Do not share it with staff members who do not need it for their job, and do not post it on public websites or unsecured documents.

Store a copy of your enrollment letter and your provider number in a find file — either a locked cabinet or a password-protected digital folder. Make sure your billing staff and anyone who submits claims on your behalf knows your correct provider number and uses it on every claim. Mistakes or inconsistencies in your provider number can delay payments or cause claims to be rejected.

If your provider number changes — for example, if you merge with another practice or change your legal business structure — your MAC will issue you a new number and send you updated enrollment paperwork. Do not continue using an old provider number after a change like this.

Frequently Asked Questions

Is my Medicare provider number the same as my NPI?

No. Your National Provider Identifier (NPI) is a 10-digit number assigned by the National Plan and Provider Enumeration System (NPPES) and used across all health insurance plans. Your Medicare provider number is specific to Medicare and may be different. You need both numbers to bill Medicare correctly.

What if I am newly enrolling with Medicare and do not have a provider number yet?

Contact your Medicare Administrative Contractor and ask about the enrollment process for your provider type. You will need to complete the appropriate CMS-855 form and submit it with supporting documents. Your MAC will review your process and assign you a provider number once you are approved.

Can I look up another provider's Medicare number?

Yes. The PECOS database is public, so you can search for any enrolled provider's information by name, location, or NPI. This is useful if you need to verify a referral partner's enrollment status or confirm their provider number for billing purposes.

What should I do if my provider number is not showing up in PECOS?

It may mean your enrollment has not been processed yet, your information in the system is outdated, or you are not enrolled with Medicare. Contact your MAC directly with your name, practice address, and Social Security number or tax ID. They can tell you your enrollment status and help you locate or update your provider number.

How often does my provider number change?

Your provider number typically stays the same throughout your career unless you change your legal business structure, merge with another practice, or have a significant change in ownership. If you change your practice location or update your information, your number usually remains the same — only your address or other details are updated.