Chemical Pathology Physician providers in the U.S.
30 NPPES records list chemical pathology physician as their primary taxonomy; Rhode Island and California have the most per resident. 2 of them appear in the Medicare Part D prescriber file: a registry record is not proof of an active practice.
What taxonomy code 207ZP0104X means
207ZP0104X is the National Uniform Claim Committee code for Pathology, Chemical Pathology, in the grouping Allopathic & Osteopathic Physicians. 30 NPPES records list it as their primary taxonomy (file of Aug 9, 2026).
A chemical pathologist has expertise in the biochemistry of the human body as it applies to the understanding of the cause and progress of disease. This physician functions as a clinical consultant in the diagnosis and treatment of human disease. Chemical pathology entails the application of biochemical data to the detection, confirmation or monitoring of disease.
Source: NUCC Health Care Provider Taxonomy code set, definition as NUCC publishes it (nucc.org); counts from CMS NPPES.
Most per resident: the 8 highest
Source: CMS NPPES, primary taxonomy 207ZP0104X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.
San Diego has the most, 3
Source: CMS NPPES, primary taxonomy 207ZP0104X by practice city, file of Aug 9, 2026.
All 16 states and D.C. with records, by state
| State | Records | Per 100,000 |
|---|---|---|
| Arizona | 1 | 0.0 |
| California | 5 | 0.0 |
| Illinois | 1 | 0.0 |
| Kentucky | 2 | 0.0 |
| Maryland | 1 | 0.0 |
| Massachusetts | 2 | 0.0 |
| Michigan | 4 | 0.0 |
| New York | 2 | 0.0 |
| State | Records | Per 100,000 |
|---|---|---|
| North Carolina | 2 | 0.0 |
| Ohio | 2 | 0.0 |
| Oklahoma | 1 | 0.0 |
| Pennsylvania | 2 | 0.0 |
| Rhode Island | 1 | 0.1 |
| Texas | 1 | 0.0 |
| Virginia | 2 | 0.0 |
| Washington | 1 | 0.0 |
In federal data
- NUCC code207ZP0104X · Pathology
- Size rank610th of 688 specialties by records (0% of all)
- In its family15th of 16 Pathology codes, 0.1% of the family
- Part D prescribers2 (6.7% of records)
- Part D claims22 a year per prescriber, on average (466th of 496)
- Industry payments3 physicians paid $11K in 2024, $4K each on average
- Concentration5 states hold half of all records
Source: CMS NPPES; Medicare Part D Prescriber PUF; CMS Open Payments 2024. Presence in these files is not a quality judgment.
A sample of chemical pathology physician records
- Shem Altman, M.D.Scottsdale, AZ1023232014
- Thomas Drake, MDLos Angeles, CA1992734529
- David Bailey, M.D.San Diego, CA1942231576
- Amadeo Pesce, PHDSan Diego, CA1972807683
- David Herold, M.D., PH.D.San Diego, CA1760414189
- Christine Nicoll, M.D.San Francisco, CA1396753430
- Frederick Smith, M.D.Chicago, IL1447250519
- Ronald Elin, M.D., PHDLouisville, KY1801873617
- Stanley Levinson, PH.D., DABCCLouisville, KY1811652472
- Gary Horowitz, M.D.Boston, MA1558308213
- David KembleBoston, MA1396503041
- Bose Kalampanayil, PHDSilver Spring, MD1205319159
Registry order, not a ranking. Search by name to find one provider.
Common questions
Why is Chemical Pathology Physician a thin NUCC code in NPPES?
Only 30 NPIs list Chemical Pathology Physician as primary taxonomy across 16 states (peak California, 5). That is 610th of 688 NUCC codes by headcount. Thin codes are still searchable by NPI; do not treat the low count as a quality signal.
Do the few Chemical Pathology Physician NPIs in Open Payments look unusual?
CMS Open Payments 2024 lists 3 paid Chemical Pathology Physician physicians totaling $11K (11 payments; average $4K, 117th of 470 by average). Presence is not a quality judgment; thin specialties often have sparse payment rows.
How much Part D prescribing does this specialty do?
Among Chemical Pathology Physician NPIs, 2 appear in the Medicare Part D Prescriber PUF (average 22 claims and $471 drug cost per prescriber; 466th of 496 specialties by average claims). Non-prescribing clinicians in the same NUCC code are still in NPPES.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy (nucc.org); Medicare Part D Prescriber PUF; CMS Open Payments 2024. Counts are self-designated primary taxonomy, not board certification.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.