Clinical Medical Laboratory: NPI taxonomy code 291U00000X
Taxonomy code 291U00000X is Clinical Medical Laboratory, in the Laboratories group.
18,964 active NPIs list it as their primary specialty (0.2% of all).
| Code | 291U00000X |
|---|---|
| Group | Laboratories |
| Classification | Clinical Medical Laboratory |
| Used for | organizations (the code is in NUCC's Non-Individual section) |
| Active NPIs, primary specialty | 18,964 (699 individuals, 18,265 organizations) |
What NUCC says: (1) A clinical laboratory is a facility for the biological, microbiological, serological, chemical, immunohematological, hematological, biophysical, cytological, pathological, or other examination of materials derived from the human body for the purpose of providing information for the diagnosis,… (excerpt of the NUCC 26.1 definition)
Find Clinical Medical Laboratory providers
Search the registry for providers listing Clinical Medical Laboratory. Pick a state to narrow it down.
Where they are
| State | Active NPIs | Share |
|---|---|---|
| Texas | 2,204 | 11.6% |
| California | 2,000 | 10.5% |
| Florida | 1,455 | 7.7% |
| Puerto Rico | 1,425 | 7.5% |
| Illinois | 1,181 | 6.2% |
| Georgia | 662 | 3.5% |
| North Carolina | 596 | 3.1% |
| Ohio | 510 | 2.7% |
| Colorado | 505 | 2.7% |
| New York | 473 | 2.5% |
Top states by practice location, from the NPPES file of September 13, 2026.
Specialty definitions are from the NUCC Health Care Provider Taxonomy (version 26.1). Which code to use on a claim depends on your NPPES record and your payer. See taxonomy codes explained.