A taxonomy code is a 10-character alphanumeric code that identifies your provider specialty. It appears on superbills and insurance claims, and some payers will reject submissions that are missing it.
What Is a Taxonomy Code?
Taxonomy codes are maintained by the National Uniform Claim Committee (NUCC) and are used in HIPAA-standard electronic transactions. The code tells an insurer not just that you are a healthcare provider, but what kind of provider you are — an LPC, an LCSW, a psychologist, etc.
On a superbill or CMS-1500 claim form, the taxonomy code goes in Box 24J (rendering provider's taxonomy) or is associated with your NPI in the NPPES registry.
Mental Health Taxonomy Codes
- 101YA0400X — Licensed Professional Counselor (LPC) — Mental Health
- 1041C0700X — Licensed Clinical Social Worker (LCSW)
- 106H00000X — Marriage and Family Therapist (MFT)
- 103T00000X — Psychologist
- 103GC0700X — Clinical Neuropsychologist
- 101YM0800X — Licensed Professional Counselor — Mental Health (alternate)
- 163W00000X — Registered Nurse (if billing as a psychiatric RN)
- 2084P0800X — Psychiatry and Neurology — Psychiatry
The full NUCC taxonomy list is available at nucc.org/taxonomy. Search by specialty description to find the most accurate code for your license.
How to Register Your Taxonomy Code with Your NPI
- Go to nppes.cms.hhs.gov and log in
- Navigate to your NPI record and click "Edit"
- Find the "Provider Taxonomy" section
- Add your taxonomy code (you can add multiple if you hold multiple licenses)
- Mark one taxonomy as your primary taxonomy code
- Save and submit — changes appear in the public NPI registry within 1–2 business days
Why Some Insurers Reject Superbills Without a Taxonomy Code
Insurers use taxonomy codes to:
- Verify that you are licensed to provide the service you billed
- Apply the correct fee schedule and reimbursement rate for your provider type
- Route the claim to the correct review team (behavioral health vs. medical)
If your taxonomy code is missing from a superbill, some payers will process the claim anyway; others will return it as incomplete. Adding your taxonomy code takes 30 seconds in Superbilled and eliminates a common rejection reason.
Taxonomy Code vs. NPI
These are two different identifiers that work together:
- NPI — A unique 10-digit number assigned to you as an individual provider. It does not encode your specialty.
- Taxonomy code — A separate code that specifies your specialty. It is associated with your NPI in the NPPES database.
Both should appear on every superbill. Superbilled includes a taxonomy code field for exactly this reason.