Guide

Which 363L Taxonomy Code a PMHNP, FNP or AGNP Picks in NPPES and PECOS

Summary

A psychiatric nurse practitioner registering in NPPES picks 363LP0808X, the Psychiatric/Mental Health specialization under the Nurse Practitioner classification in version 26.1 of the NUCC taxonomy code set. The provider chooses the code; no board or payer assigns it. The enrollment application behind PECOS asks for no taxonomy code at all, and every code in the 363L family maps to the same Medicare specialty, so the drift worth watching runs between NPPES and the enrollment record rather than between two codes.

By Gale Editorial · Updated 2026-09-01. Every figure cited to a dated source. How we write.

Which 363L code does a psychiatric nurse practitioner use?

363LP0808X. In version 26.1 of the NUCC Health Care Provider Taxonomy, that string is the Psychiatric/Mental Health specialization under the Nurse Practitioner classification, which is the 363L family 1. Nobody assigns it. NUCC states the codes are self-selected by the provider, and that picking the most appropriate one is a business decision the provider makes from their own education and training 2.

The code is ten characters, and it is built in three levels: Provider Grouping, Classification, and Area of Specialization, the last of which is what separates one nurse practitioner code from another 2. 363L is the classification. Every code in the family shares it.

But almost nobody asks this question while calmly filling out a registry form.

It arrives attached to something that already went wrong: a denial, a credentialing packet returned for correction, a directory entry that files the practice under the wrong heading. NUCC built the code set for ASC X12N health care transactions, including the HIPAA-mandated ones, and for NPI enumeration 2. That is the range of places the ten characters travel.

What an FNP or an AGNP picks instead

The Nurse Practitioner classification carries 18 codes in version 26.1: the undifferentiated 363L00000X plus 17 specializations 1. A family nurse practitioner takes 363LF0000X. An adult-gerontology nurse practitioner has no code of that name to take, because the set holds no Adult-Gerontology specialization, so the choice falls between Adult Health, 363LA2200X, and Gerontology, 363LG0600X 1.

Nine of the 18, as they read in version 26.1:

CodeSpecialization
363L00000Xnone; the undifferentiated Nurse Practitioner code
363LF0000XFamily
363LP0808XPsychiatric/Mental Health
363LA2200XAdult Health
363LG0600XGerontology
363LP2300XPrimary Care
363LA2100XAcute Care
363LP0200XPediatrics
363LW0102XWomen's Health

No official crosswalk runs from a national certification to one of these codes. NUCC's definition of the classification is a broad one, a registered nurse with a graduate degree prepared for advanced practice or one who completed additional training, and its list of nurse practitioner specialists is written as examples, "but are not limited to" the ones named 1.

So a clinician holding PMHNP-BC who selects 363LP0808X is matching the code to their education and training, which is the test NUCC sets, rather than following a mapping table somebody published.

PECOS never asks for a taxonomy code

The application asks for a checkbox. The CMS-855I gives an eligible professional a list of non-physician specialties and instructs the applicant to check only one, with a separate application required for each additional non-physician specialty type; the form collects no taxonomy code anywhere 3. Medicare arrives at a specialty a different way. Non-physician practitioners are assigned a Medicare specialty code when they enroll, based on their profession 4.

That code is 50, Nurse Practitioner, in the Claims Processing Manual's list of non-physician practitioner specialty codes 4. And every one of the 18 363L codes maps to Medicare specialty code 50, provider and supplier type Nurse Practitioner, in the August 2026 Medicare Provider and Supplier Taxonomy Crosswalk, the file CMS reissues several times a year 5.

Choosing Psychiatric/Mental Health over Family, or over the undifferentiated code, moves nothing on the Medicare enrollment record.

The crosswalk speaks for Medicare and for nothing else. What a commercial plan expects to see for taxonomy codes on claims, and what it holds in its own credentialing file, comes from that plan's published policy, and no federal file settles it. Read the policy for the plan in front of you and hold the answer per payer.

Where NPPES and the Medicare record drift apart

Not in the taxonomy field. CMS states plainly that updates to a provider's NPI record in NPPES do not automatically update that provider's Medicare enrollment information 6. Those are two records with two separate update duties. The CMS-855I is explicit that the identity fields have to agree across both: name, SSN, legal business name, TIN and NPI must match exactly in PECOS and NPPES 3.

The clocks differ too. A covered health care provider must report any change to the information given for the NPI within 30 days of the change 6. On the enrollment side, 42 CFR 424.516(d) gives physicians and non-physician practitioners 30 days for a change of ownership, an adverse legal action, or a change, addition or deletion of a practice location, and 90 days for all other enrollment changes 7.

Whether a taxonomy edit counts as one of those other enrollment changes is not something these documents answer. Taxonomy is not a field on the 855I, so there is nothing in the enrollment record for the edit to land in 3. A practitioner who wants that settled for their own record can put the question to their MAC's provider enrollment guidance, which is the office that maintains the record.

An individual is eligible for exactly one Type 1 NPI, and an incorporated practitioner may hold that Type 1 for themselves alongside a Type 2 for the corporation or LLC 6. Two NPIs, when they exist, are two registry records, each carrying its own taxonomy selection.

What the code does not decide

Scope of practice, and which services get paid. NUCC draws the boundary directly: scope of licensure is outside the purview of the code set, and the codes define an area of specialty rather than the services rendered 2. Whether a state requires a collaborative agreement or protocol is settled by that state's nurse practice act. The registry entry has no part in that question.

The same boundary covers the billing questions that feel adjacent to it. Which of the Medicare wellness and care-management codes an NP can bill is a coverage and enrollment question, and the specialization string does not reach it.

Neither does the NPI itself. CMS is blunt about what the number is not: holding an NPI does not ensure a provider is licensed or credentialed, does not enroll a provider in a health plan, and does not guarantee payment 6.

Payer instructions live somewhere else again. Whether a given plan wants modifier SA on a claim, and on which claims, comes out of that plan's own published policy, and it is a separate question from which ten characters sit in NPPES.

Setting the record, and keeping it straight

Pick the code from the current code set, enter it in NPPES, and treat the Medicare enrollment record as a separate file maintained on its own clock. The code set is used in the NPI application for enumeration, so the decision has to be made before the registry record can be right 2. Everything downstream reads that record.

1. Read the code out of the current NUCC file rather than out of a summary. Version 26.1 is the version quoted on this page, downloaded 2026-09-01, and NUCC reissues the code set twice a year 1. 2. Match the code to the education and training behind the credential, because that is the test NUCC sets and no certification-to-code mapping carries authority over it 2. 3. Leave PECOS out of the taxonomy decision. The CMS-855I has no field for it, and the specialty it does record is assigned from the profession 3. 4. Calendar the two reporting duties separately: 30 days for a change to NPI information 6, and 30 or 90 days on the enrollment side depending on what changed 7. 5. Check the date on the crosswalk before quoting the Medicare mapping to anyone. The file behind this page is the August 2026 issue 5.

Correcting a taxonomy entry in NPPES is a change to NPI information, and it carries the 30-day duty like any other 6. Whether anything has to move on the enrollment side is a question for that record, and NPPES will not answer it, because CMS has already said the two do not update each other 6.

Common questions

363LP0808X, the Psychiatric/Mental Health specialization under the Nurse Practitioner classification in version 26.1 of the NUCC Health Care Provider Taxonomy. The provider selects it. NUCC treats the choice as a business decision made from the clinician's own education and training, and reissues the code set twice a year, so confirm the string against the current file before entering it in NPPES.

No. The CMS-855I collects no taxonomy code anywhere. It asks an eligible professional to check exactly one non-physician specialty box, and it requires a separate application for each additional non-physician specialty type. Medicare assigns non-physician practitioners a specialty code at enrollment based on profession, and for a nurse practitioner that code is 50.

No. CMS states that updates to an NPI record in NPPES do not automatically update the provider's Medicare enrollment information. A change to NPI information carries a 30-day reporting duty. On the enrollment side the clock is 30 days for ownership, adverse legal actions and practice locations, and 90 days for other enrollment changes.

Version 26.1 of the code set holds no Adult-Gerontology specialization, so there is no exact match to select. The available neighbours are Adult Health, 363LA2200X, and Gerontology, 363LG0600X, and the undifferentiated 363L00000X remains available. NUCC's test is the clinician's own education and training, since no published certification-to-code mapping carries authority.

No. All 18 of the 363L codes crosswalk to the same Medicare specialty code, 50, provider and supplier type Nurse Practitioner, in the August 2026 CMS crosswalk file. Psychiatric/Mental Health, Family and Acute Care all land in the same place. CMS reissues that file several times a year, so check its date before relying on the mapping.

None of the federal sources here publishes a denial rate or names an edit that fires on a taxonomy mismatch, so treat any figure you see as unsourced. What is documented is the mechanism: NPPES and the Medicare enrollment record do not update each other, and a commercial plan's expectations for taxonomy on a claim come from that plan's own published policy.

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References

  1. 1.National Uniform Claim Committee (NUCC) (2026). Health Care Provider Taxonomy code set, version 26.1 (nucc_taxonomy_261.csv). National Uniform Claim Committee. link ✓The 18 codes in the 363L Nurse Practitioner classification in version 26.1, the exact strings for 363LP0808X, 363L00000X, 363LF0000X, 363LA2200X, 363LG0600X, 363LP2300X, 363LA2100X, 363LP0200X and 363LW0102X, the absence of an Adult-Gerontology specialization, and the classification definition with its 'but are not limited to' list of specialists.
  2. 2.National Uniform Claim Committee (NUCC) (2026). Health Care Provider Taxonomy. nucc.org. link ✓That taxonomy codes are self-selected by the provider as a business decision based on education and training, the ten-character code and its three levels, use in ASC X12N and HIPAA-mandated transactions and in NPI enumeration, that the code set is used in the NPI application for enumeration, and that scope of licensure and services rendered are outside the code set's purview.
  3. 3.Centers for Medicare & Medicaid Services (2026). Form CMS-855I — Medicare Enrollment Application: Physicians and Non-Physician Practitioners. Centers for Medicare & Medicaid Services (CMS). link ✓That the application asks the applicant to check only one non-physician specialty and to file a separate application for each additional non-physician specialty type, that it collects no taxonomy code, and that name, SSN, legal business name, TIN and NPI must match exactly in PECOS and NPPES.
  4. 4.Centers for Medicare & Medicaid Services (2024). Medicare Claims Processing Manual, Chapter 26 — Completing and Processing Form CMS-1500 Data Set. Centers for Medicare & Medicaid Services (Pub. 100-04). link ✓That non-physician practitioners are assigned a Medicare specialty code at enrollment based on their profession rather than self-designating it, and that specialty code 50 is Nurse Practitioner in the manual's list.
  5. 5.Centers for Medicare & Medicaid Services (2026). Medicare Provider and Supplier Taxonomy Crosswalk (August 2026). CMS Data — Provider Characteristics / Medicare Provider Supplier Enrollment. link ✓That every 363L code maps to Medicare specialty code 50, provider and supplier type Nurse Practitioner, as of the August 2026 crosswalk file, and that CMS reissues the file periodically so its date has to be checked.
  6. 6.Centers for Medicare & Medicaid Services (2024). The National Provider Identifier (NPI) Fact Sheet. CMS (December 2024). link ✓That NPPES updates do not automatically update a Medicare enrollment record, the 30-day duty to report changes to NPI information, one Type 1 NPI per individual alongside a Type 2 for an incorporated practice, and that holding an NPI does not license, credential, enroll or guarantee payment.
  7. 7.Office of the Federal Register / Centers for Medicare & Medicaid Services (2026). § 424.516 Additional provider and supplier requirements for enrolling and maintaining active enrollment status in the Medicare program.. Electronic Code of Federal Regulations (42 CFR Part 424, Subpart P). link ✓The reporting clock in paragraph (d) for physicians and non-physician practitioners: 30 days for a change of ownership, an adverse legal action, or a change, addition or deletion of a practice location, and 90 days for all other enrollment changes.

https://www.gale.care/for-providers/pq-np-taxonomy-code-363l-claim-mismatch · 7 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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