NPI types and taxonomy codes
There are two kinds of NPI: Type 1 (NPI-1) identifies an individual provider, and Type 2 (NPI-2) identifies an organization such as a clinic or hospital. A taxonomy code is a separate 10-character code from the NUCC Health Care Provider Taxonomy set that describes a provider’s classification and specialty.
Type 1 and Type 2 at a glance
| Type 1 (NPI-1) | Type 2 (NPI-2) | |
|---|---|---|
| Who | Individual clinicians, including sole proprietors | Organizations: clinics, group practices, hospitals, pharmacies |
| How many | One per person | One per organization, plus optional subpart NPIs |
| Name shown | Person’s name and credential | Organization’s legal business name |
What is a taxonomy code?
A taxonomy code describes what a provider does. Codes are 10 characters and come from the National Uniform Claim Committee (NUCC) Health Care Provider Taxonomy code set, which NUCC updates on a regular schedule. A registry entry can list several taxonomies, and one is flagged as primary.
How to read a taxonomy row
| Field | Meaning |
|---|---|
| Code | The 10-character NUCC code |
| Description | The classification and specialization in words |
| Primary | The provider’s main taxonomy |
| License state and number | Optional license details the provider chose to report |
Why this matters
Billing systems and directories use the taxonomy to match a provider to a service. If a taxonomy is out of date, claims and directory listings can be affected, so providers should update their NPPES entry when their practice changes.
Frequently asked questions
Can a provider have more than one taxonomy?
Yes. Providers can report several taxonomies and mark one primary.
Is the taxonomy code a license?
No. It is a self-reported classification. It does not prove training or licensure.
Related guides
- What is an NPI number?: The 10-digit identifier every U.S. health care provider uses.
- How to look up an NPI by name: Find a provider’s NPI with a name, state or specialty.
Sources: CMS: National Provider Identifier Standard; CMS NPPES NPI Registry; NUCC Health Care Provider Taxonomy. This guide is general information, not legal or billing advice.