Clinical Molecular Genetics Physician providers in the U.S.
134 NPPES records list clinical molecular genetics physician as their primary taxonomy; Massachusetts and California have the most per resident. 6 of them appear in the Medicare Part D prescriber file: a registry record is not proof of an active practice.
What taxonomy code 207SG0203X means
207SG0203X is the National Uniform Claim Committee code for Medical Genetics, Clinical Molecular Genetics, in the grouping Allopathic & Osteopathic Physicians. 134 NPPES records list it as their primary taxonomy (file of Aug 9, 2026).
A clinical molecular geneticist demonstrates competence in performing and interpreting molecular analyses relevant to the diagnosis and management of human genetic diseases and is a consultant regarding laboratory diagnosis of a broad range of inherited disorders.
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 207SG0203X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.
Westborough has the most, 9
Source: CMS NPPES, primary taxonomy 207SG0203X by practice city, file of Aug 9, 2026.
All 26 states and D.C. with records, by state
| State | Records | Per 100,000 |
|---|---|---|
| Alabama | 1 | 0.0 |
| California | 24 | 0.1 |
| Colorado | 5 | 0.1 |
| Connecticut | 2 | 0.1 |
| Florida | 6 | 0.0 |
| Georgia | 2 | 0.0 |
| Illinois | 2 | 0.0 |
| Indiana | 4 | 0.1 |
| Iowa | 1 | 0.0 |
| Maryland | 3 | 0.0 |
| Massachusetts | 14 | 0.2 |
| Michigan | 2 | 0.0 |
| Minnesota | 1 | 0.0 |
| State | Records | Per 100,000 |
|---|---|---|
| Missouri | 1 | 0.0 |
| New Jersey | 4 | 0.0 |
| New York | 14 | 0.1 |
| North Carolina | 5 | 0.0 |
| Ohio | 5 | 0.0 |
| Oregon | 3 | 0.1 |
| Pennsylvania | 3 | 0.0 |
| South Carolina | 3 | 0.1 |
| Tennessee | 4 | 0.1 |
| Texas | 9 | 0.0 |
| Utah | 4 | 0.1 |
| Washington | 9 | 0.1 |
| Wisconsin | 2 | 0.0 |
In federal data
- NUCC code207SG0203X · Medical Genetics
- Size rank494th of 688 specialties by records (0% of all)
- In its family2nd of 7 Medical Genetics codes, 9.6% of the family
- Part D prescribers6 (4.5% of records)
- Part D claims60 a year per prescriber, on average (393rd of 496)
- Industry payments13 physicians paid $270K in 2024, $21K 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 clinical molecular genetics physician records
- Melissa Kelly, PHD, HCLD/CC(ABB)Harvest, AL1720857998
- Julie Korenberg, M.D.Los Angeles, CA1831126424
- Avinash Dharmadhikari, PHDLos Angeles, CA1669326740
- Joshua Deignan, PHDLos Angeles, CA1568860120
- Henry Lin, M.D.Torrance, CA1457398760
- Perry Chan, PH.D.Calabasas Hills, CA1760454581
- Victoria Howell, C.G.CLa Jolla, CA1972057362
- Chia-Ling Kawakami, PH.D., ABMGG, NYCOQ,Aliso Viejo, CA1043846728
- Bernard Ilagan, MD, MHASan Juan Capistrano, CA1063746485
- Ying ZhangOrange, CA1700506938
- Jennifer Keen-Kim, PH.DSan Carlos, CA1063992386
- Yu Leng Phua, PHD, FACMGSan Carlos, CA1538035233
Registry order, not a ranking. Search by name to find one provider.
Common questions
Why is Clinical Molecular Genetics Physician a thin NUCC code in NPPES?
Only 134 NPIs list Clinical Molecular Genetics Physician as primary taxonomy across 27 states (peak California, 24). That is 494th 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 Clinical Molecular Genetics Physician NPIs in Open Payments look unusual?
CMS Open Payments 2024 lists 13 paid Clinical Molecular Genetics Physician physicians totaling $270K (160 payments; average $21K, 16th 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 Clinical Molecular Genetics Physician NPIs, 6 appear in the Medicare Part D Prescriber PUF (average 60 claims and $806K drug cost per prescriber; 393rd 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.