Clinical Medical Laboratory
18,676 active US providers register Clinical Medical Laboratory as their primary taxonomy. That is 0.2% of every provider in the registry, and the 85th largest of 584 specialties with a page here.
- Taxonomy code
- 291U00000X
- Grouping
- Laboratories
- Classification
- Clinical Medical Laboratory
- Active providers
- 18,676
- States covered
- 51 of 51
What the code means
(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, prevention, or treatment of any disease or impairment of, human beings. These examinations also include procedures to determine, measure, or otherwise describe the presence or absence of various substances or organisms in the body. Facilities only collecting or preparing specimens (or both) or only serving as a mailing service and not performing testing are not considered clinical laboratories. (2) Any facility that examines materials from the human body for purposes of providing information for the diagnosis, prevention, or treatment of any disease or impairment of, or the assessment of, the health of human beings. Typical divisions of a clinical laboratory include hematology, cytology, bacteriology, histology, biochemistry, medical toxicology, and serology.
Definition quoted verbatim from the NUCC Health Care Provider Taxonomy code set, version 25.1. Not paraphrased.
Where they are
Counted by practice location, not by mailing address or by licence state. A provider practising across a state line is counted where they practise.
| State | Providers | Share |
|---|---|---|
| Texas | 2,125 | |
| California | 1,967 | |
| Florida | 1,442 | |
| Illinois | 1,155 | |
| Georgia | 640 | |
| North Carolina | 590 | |
| Ohio | 505 | |
| Colorado | 500 | |
| Michigan | 467 | |
| New York | 467 | |
| Pennsylvania | 438 | |
| Maryland | 436 | |
| Arizona | 423 | |
| Washington | 404 | |
| Virginia | 393 |
Showing the 15 largest of 51 states with at least one.
Who registers under this code
692 of these are people and 17,984 are organisations, so 96% of the code is businesses rather than clinicians. Half of them had registered by 2015, and 5,741 registered in the last five years, 31% of the current population.
That is close to the pace of the registry as a whole.
Where the practices are
By practice-location city. City counts are noisier than state counts, because a large employer files one address for many providers.
- HOUSTON, TX467
- CHICAGO, IL306
- DALLAS, TX214
- LOS ANGELES, CA127
- PHOENIX, AZ127
- SAN ANTONIO, TX123
- SAN DIEGO, CA114
- MIAMI, FL101
- LAS VEGAS, NV100
- IRVINE, CA99
What else they list
Providers whose primary code is Clinical Medical Laboratory most often carry these secondary taxonomies as well. This is the closest thing the registry has to a map of which specialties overlap in practice, and it is not published anywhere else.
| Also listed | Providers | Share |
|---|---|---|
| Anatomic Pathology & Clinical Pathology Physician | 94 | 0.5% |
| Durable Medical Equipment & Medical Supplies | 83 | 0.4% |
| Health Service Clinic/Center | 66 | 0.4% |
| Phlebotomy Technician | 66 | 0.4% |
| Home Health Agency | 65 | 0.3% |
| Clinic/Center | 61 | 0.3% |
| In Home Supportive Care Agency | 56 | 0.3% |
| Clinical Pathology/Laboratory Medicine Physician | 47 | 0.3% |
Looking up a specific provider
These counts come from the monthly NPPES file. To check one provider, use their NPI: the lookup reads the live registry and shows whether the identifier is still active, which the monthly file cannot tell you about the last few weeks.
Counts from npidata_pfile_20050523-20260712.csv, built 2026-08-09. Primary taxonomy only, deactivated identifiers excluded.