Healthcare Provider Taxonomy Code

Key facts

Maintained by

National Uniform Claim Committee (NUCC)

Format

10 alphanumeric characters, for example 207R00000X (Internal Medicine)

Structure

Grouping, classification and specialization levels

Update cycle

Twice a year, with versions effective January 1 and July 1

Used in

NPPES records and X12 837 claim transactions

What is a Healthcare Provider Taxonomy Code?

The taxonomy code set gives every kind of provider a standard code, from physicians and nurse practitioners to pharmacies, laboratories and ambulance services. Providers choose the codes that describe them when they apply for a National Provider Identifier (NPI), and claims can carry a taxonomy code to tell a payer which type of provider delivered the service.

The code set has two main sections: individuals and groups of individuals, and non-individuals such as hospitals, agencies and suppliers. The NUCC adds, retires and redefines codes in its releases, so older records can carry codes that are no longer current.

How taxonomy codes are structured

Each code reads from general to specific:

In NPPES, a provider can list more than one taxonomy code but must mark one as primary.

• Grouping: a broad category, such as Allopathic & Osteopathic Physicians.
• Classification: a provider type within the grouping, such as Internal Medicine (207R00000X).
• Specialization: a narrower area within the classification, such as Cardiovascular Disease (207RC0000X).

Why taxonomy codes matter

Taxonomy is the one specialty field available for every NPI, including providers who never bill Medicare. Analysts use it to:

• Build target lists by specialty, such as every cardiologist or psychiatric nurse practitioner in a state.
• Separate individual clinicians from organizations, and hospitals from clinics, pharmacies and suppliers.
• Apply specialty-based rules in payer networks, claims editing and credentialing workflows.

Taxonomy codes vs Medicare specialty codes

Medicare uses its own two-character specialty codes, assigned through Medicare enrollment in PECOS, and CMS publishes a crosswalk between the two systems.

Because taxonomy codes are self-selected in NPPES and not verified against training or board certification, they can differ from a provider's Medicare specialty. Some providers pick a broad classification while practicing in a narrow subspecialty, and few update their codes when their practice changes.