Hematology & Oncology Physician providers in the U.S.
14,141 NPPES records list hematology & oncology physician as their primary taxonomy, about 4.2 per 100,000 residents; District of Columbia and Rhode Island have the most per resident. 10,784 of them appear in the Medicare Part D prescriber file: a registry record is not proof of an active practice.
What taxonomy code 207RH0003X means
207RH0003X is the National Uniform Claim Committee code for Internal Medicine, Hematology & Oncology, in the grouping Allopathic & Osteopathic Physicians. 14,141 NPPES records list it as their primary taxonomy (file of Aug 9, 2026).
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
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 207RH0003X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.
New York has the most, 336
Source: CMS NPPES, primary taxonomy 207RH0003X by practice city, file of Aug 9, 2026.
All 51 by state
| State | Records | Per 100,000 |
|---|---|---|
| Alabama | 191 | 3.7 |
| Alaska | 21 | 2.9 |
| Arizona | 285 | 3.8 |
| Arkansas | 103 | 3.4 |
| California | 1,583 | 4.1 |
| Colorado | 212 | 3.6 |
| Connecticut | 198 | 5.5 |
| Delaware | 31 | 3.0 |
| District of Columbia | 81 | 11.9 |
| Florida | 818 | 3.6 |
| Georgia | 396 | 3.6 |
| Hawaii | 49 | 3.4 |
| Idaho | 38 | 1.9 |
| Illinois | 666 | 5.3 |
| Indiana | 245 | 3.6 |
| Iowa | 90 | 2.8 |
| Kansas | 113 | 3.8 |
| Kentucky | 152 | 3.4 |
| Louisiana | 188 | 4.1 |
| Maine | 77 | 5.5 |
| Maryland | 317 | 5.1 |
| Massachusetts | 461 | 6.6 |
| Michigan | 340 | 3.4 |
| Minnesota | 274 | 4.8 |
| Mississippi | 64 | 2.2 |
| Missouri | 237 | 3.8 |
| State | Records | Per 100,000 |
|---|---|---|
| Montana | 44 | 3.9 |
| Nebraska | 80 | 4.0 |
| Nevada | 88 | 2.8 |
| New Hampshire | 76 | 5.4 |
| New Jersey | 399 | 4.3 |
| New Mexico | 64 | 3.0 |
| New York | 1,163 | 5.9 |
| North Carolina | 431 | 4.0 |
| North Dakota | 39 | 5.0 |
| Ohio | 513 | 4.4 |
| Oklahoma | 128 | 3.2 |
| Oregon | 138 | 3.3 |
| Pennsylvania | 784 | 6.0 |
| Rhode Island | 88 | 8.0 |
| South Carolina | 181 | 3.4 |
| South Dakota | 31 | 3.4 |
| Tennessee | 273 | 3.8 |
| Texas | 922 | 3.0 |
| Utah | 99 | 2.9 |
| Vermont | 22 | 3.4 |
| Virginia | 346 | 4.0 |
| Washington | 476 | 6.1 |
| West Virginia | 78 | 4.4 |
| Wisconsin | 295 | 5.0 |
| Wyoming | 12 | 2.1 |
In federal data
- NUCC code207RH0003X · Internal Medicine
- Size rank76th of 688 specialties by records (0.19% of all)
- In its family5th of 31 Internal Medicine codes, 4.6% of the family
- Part D prescribers10,784 (76.3% of records)
- Part D claims877 a year per prescriber, on average (93rd of 496)
- Industry payments8,560 physicians paid $64.0M in 2024, $7K each on average
- Concentration9 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 hematology & oncology physician records
- Susan Delgalvis, M.D.Anchorage, AK1184605313
- Mary Klix, MDAnchorage, AK1669447595
- Steven Liu, M.D.Anchorage, AK1164462834
- Max Rabinowitz, MDAnchorage, AK1295770972
- Mary Stewart, MDAnchorage, AK1245268002
- Matthew Olnes, MDAnchorage, AK1396760021
- Shannon Smiley, M.D.Anchorage, AK1891715942
- Theodore Kim, D.O.Anchorage, AK1952325359
- Ellen Chirichella, MDAnchorage, AK1952528499
- Kendal Webb, M.D.Anchorage, AK1154615250
- Anusiyanthan Mariampillai, M.DAnchorage, AK1518221977
- Natalie Wallace, MD, MPHAnchorage, AK1386059061
- Charles Buess, MDAnchorage, AK1124548284
- Jonathon Rostas, DOAnchorage, AK1063914257
- James Sprott, MDAnchorage, AK1104818913
- Colleen Kersgard, MDPalmer, AK1194875831
Registry order, not a ranking. Search by name to find one provider.
Common questions
Where does the large Hematology & Oncology Physician headcount concentrate?
14,141 Hematology & Oncology Physician NPIs span 54 states; California alone holds 1,583. Top metros include New York, NY; Seattle, WA; Houston, TX; Boston, MA. Nationally this is 76th of 688 NUCC codes.
How large is Hematology & Oncology Physician's Open Payments footprint?
CMS Open Payments 2024 lists 8,560 Hematology & Oncology Physician physicians totaling $64.0M (319,957 payments; average $7K, 57th of 470). Presence in Open Payments is not a quality judgment.
How heavy is Hematology & Oncology Physician Part D prescribing at scale?
Among Hematology & Oncology Physician NPIs, 10,784 appear in the Medicare Part D Prescriber PUF (average 877 claims and $2.2M drug cost per prescriber; 93rd 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.