Taxonomy code

A taxonomy code says what kind of provider is billing. The code set is maintained by the National Uniform Claim Committee (NUCC), which has administered it since 2001, and it was built for the X12 health care transactions and for the NPI application. Each code is ten alphanumeric characters arranged in three levels: a provider grouping, a classification and an area of specialization. A provider can hold more than one, with one marked as primary in NPPES.

Payers use the code in two places. At enrollment, it tells the plan which specialty the provider is being credentialed under and often which fee schedule applies. On the claim, some payers require it in the provider loops of the 837P so they can match the rendering provider to that enrollment record. Medicaid programs and managed care plans are the ones most likely to read it line by line, and a code that does not match the enrollment comes back as an identifier or enrollment denial.

The mistake is letting the NPPES record, the payer enrollment and the practice management system disagree. A provider changes specialty, adds a certification or moves from one group to another, and only one of the three records is updated. Set the taxonomy once, copy it to every payer application and to the billing system, and treat any change as a credentialing task rather than a data entry fix.