NPI Not Active in NPPES: Causes and Fixes Before PECOS

Published October 5, 2026

A Medicare enrollment starts from your NPI. If the NPI is not active in NPPES, or the NPPES record does not match what you put on the enrollment, the application will not go through cleanly. Here is what "not active" means and what to check.

What "not active" means

The National Provider System assigns each provider one NPI and keeps the information about it current. It can deactivate an NPI when an organization dissolves, when an individual provider dies, or in other circumstances that justify it, and it can reactivate a deactivated NPI when it gets the right information. (Source: 45 CFR part 162, subpart D, the National Provider Identifier (162.406 to 162.410), 45 CFR 162.408(b) to (d).) A deactivated NPI is never given to anyone else. (Source: 45 CFR part 162, subpart D, the National Provider Identifier (162.406 to 162.410), 45 CFR 162.408(e).)

In the public NPI Registry, each record carries a status field in its basic information. Active records show the status "A". The registry's data comes from NPPES daily. (Source: NPPES NPI Registry: API help (version 2.1).)

Not the same as Medicare deactivation

NPPES deactivating an NPI is one thing. Medicare deactivating your billing privileges is another, under a different rule, for reasons such as no Medicare claims for 6 consecutive calendar months, not reporting a change, or not answering a revalidation request within 90 days. (Source: 42 CFR 424.540, deactivation of Medicare billing privileges, (a).) To reactivate Medicare billing privileges, you recertify that your enrollment information is correct and furnish anything missing, and CMS can require a complete new CMS-855. (Source: 42 CFR 424.540, deactivation of Medicare billing privileges, (b).) If your NPI is fine but Medicare says you are deactivated, this is the rule to read.

How to check the registry

1. Go to the NPI Registry search and enter your NPI number. You can also search by type, taxonomy, name or location. (Source: NPPES NPI Registry: search.)
2. Check the type. The registry calls Type 1 NPIs "Individual Providers" (NPI-1) and Type 2 NPIs "Organizational Providers" (NPI-2). (Source: NPPES NPI Registry: API help (version 2.1).) An individual practitioner enrolling on the CMS-855I uses their own individual NPI.
3. Check the name, exactly as spelled.
4. Check the taxonomy codes and which one is primary. Each record lists its taxonomies with the code, a primary flag, and the license and state. (Source: NPPES NPI Registry: API help (version 2.1).)
5. Remember the registry only reflects NPPES. The NPI Registry itself says issuing an NPI does not ensure or validate that the provider is licensed or credentialed. (Source: NPPES NPI Registry: API help (version 2.1).)

The mismatches that hold up PECOS

The CMS-855I is direct about this:

The Name and Social Security Number (SSN) that you furnish in section 2A and, if applicable, the Legal Business Name (LBN) and Tax Identification Number (TIN) you furnish in section 4A must be the same Name, SSN, LBN and TIN you used to obtain your NPI. Once this information is entered into PECOS from this application, your Name, SSN, LBN, TIN and NPI must match exactly in both PECOS and NPPES. (Source: CMS-855I (05/23), Medicare enrollment application for physicians and non-physician practitioners, page 2.)

• Name: a married name in PECOS and a former name in NPPES, a missing middle name, or a different spelling.
• Legal business name and TIN: enrolling a professional corporation or LLC, or a sole proprietorship with an EIN, means the name and TIN in section 4A, the IRS confirmation (such as a CP-575) and NPPES all have to agree. (Source: CMS-855I (05/23), Medicare enrollment application for physicians and non-physician practitioners, section 12.)
• Type: an organization NPI where your individual NPI belongs, or the reverse.
• Taxonomy: the specialty on your enrollment and the taxonomy on NPPES describe the same practice. The CMS-855I's exact-match list does not include taxonomy, so treat a difference as something to review and correct in whichever record is wrong, not as a rule we can cite.

How to fix it

1. Fix NPPES first. Covered providers must report changes to their NPPES data within 30 days of the change. (Source: 45 CFR part 162, subpart D, the National Provider Identifier (162.406 to 162.410), 45 CFR 162.410(a)(4).)
2. If the NPI was deactivated, ask NPPES to reactivate it rather than applying for a new one. (Source: 45 CFR part 162, subpart D, the National Provider Identifier (162.406 to 162.410), 45 CFR 162.408(d).)
3. Check the registry again: it refreshes from NPPES daily. (Source: NPPES NPI Registry: API help (version 2.1).)
4. Then submit or correct the PECOS application so it matches NPPES exactly.