Allergy & Immunology (Internal Medicine) Physician providers in the U.S.
594 NPPES records list allergy & immunology (internal medicine) physician as their primary taxonomy, about 0.2 per 100,000 residents; District of Columbia and Maryland have the most per resident. 429 of them appear in the Medicare Part D prescriber file: a registry record is not proof of an active practice.
What taxonomy code 207RA0201X means
207RA0201X is the National Uniform Claim Committee code for Internal Medicine, Allergy & Immunology, in the grouping Allopathic & Osteopathic Physicians. 594 NPPES records list it as their primary taxonomy (file of Aug 9, 2026).
An internist doctor of osteopathy that specializes in the treatment of allergy and immunologic disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine can obtain a Certificate of Special Qualifications in the field of Allergy & Immunology.
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 207RA0201X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.
Saint Louis has the most, 20
Source: CMS NPPES, primary taxonomy 207RA0201X by practice city, file of Aug 9, 2026.
All 47 states and D.C. with records, by state
| State | Records | Per 100,000 |
|---|---|---|
| Alabama | 4 | 0.1 |
| Arizona | 8 | 0.1 |
| Arkansas | 6 | 0.2 |
| California | 81 | 0.2 |
| Colorado | 12 | 0.2 |
| Connecticut | 8 | 0.2 |
| Delaware | 1 | 0.1 |
| District of Columbia | 5 | 0.7 |
| Florida | 25 | 0.1 |
| Georgia | 11 | 0.1 |
| Hawaii | 2 | 0.1 |
| Illinois | 22 | 0.2 |
| Indiana | 7 | 0.1 |
| Iowa | 6 | 0.2 |
| Kansas | 8 | 0.3 |
| Kentucky | 7 | 0.2 |
| Louisiana | 7 | 0.2 |
| Maine | 2 | 0.1 |
| Maryland | 30 | 0.5 |
| Massachusetts | 25 | 0.4 |
| Michigan | 16 | 0.2 |
| Minnesota | 9 | 0.2 |
| Mississippi | 5 | 0.2 |
| Missouri | 28 | 0.5 |
| State | Records | Per 100,000 |
|---|---|---|
| Montana | 1 | 0.1 |
| Nebraska | 1 | 0.1 |
| Nevada | 2 | 0.1 |
| New Hampshire | 2 | 0.1 |
| New Jersey | 16 | 0.2 |
| New Mexico | 3 | 0.1 |
| New York | 61 | 0.3 |
| North Carolina | 7 | 0.1 |
| North Dakota | 2 | 0.3 |
| Ohio | 11 | 0.1 |
| Oklahoma | 3 | 0.1 |
| Oregon | 4 | 0.1 |
| Pennsylvania | 21 | 0.2 |
| South Carolina | 4 | 0.1 |
| South Dakota | 5 | 0.5 |
| Tennessee | 5 | 0.1 |
| Texas | 50 | 0.2 |
| Utah | 3 | 0.1 |
| Virginia | 16 | 0.2 |
| Washington | 12 | 0.2 |
| West Virginia | 1 | 0.1 |
| Wisconsin | 22 | 0.4 |
| Wyoming | 1 | 0.2 |
In federal data
- NUCC code207RA0201X · Internal Medicine
- Size rank317th of 688 specialties by records (0.01% of all)
- In its family20th of 31 Internal Medicine codes, 0.2% of the family
- Part D prescribers429 (72.2% of records)
- Part D claims789 a year per prescriber, on average (113th of 496)
- Industry payments321 physicians paid $2.4M in 2024, $7K each on average
- Concentration7 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 allergy & immunology (internal medicine) physician records
- Miranda Curtiss, M.D., PH.D.Birmingham, AL1154688224
- Elizabeth George, M.D.Birmingham, AL1396291068
- Bindu Bennuri, MDNorthport, AL1063511202
- Robert Greer, D.O.Mobile, AL1912386194
- Karl Sitz, M.D.Little Rock, AR1518959691
- Blake Scheer, M.D.Little Rock, AR1871585950
- Stacy Griffin, M.D.Little Rock, AR1407892805
- Kim Ngan Jackson, MDLittle Rock, AR1902292329
- Ashley Stoner, M.D.Little Rock, AR1497118814
- Charles Sisco, M.D.Fayetteville, AR1124021639
- Catherine Freeman, M.D.Phoenix, AZ1770935538
- Kiranjit Khalsa, MDPhoenix, AZ1720321250
- Ariel Leung, MDChandler, AZ1366061129
- Alex Wonnaparhown, MDScottsdale, AZ1154856052
- Gilbert Ortega, M.D.Peoria, AZ1003349242
- Jacob Pinnas, M. D.Tucson, AZ1427389303
Registry order, not a ranking. Search by name to find one provider.
Common questions
How should I read Allergy & Immunology (Internal Medicine) Physician's mid-pack national roster?
594 CMS-registered Allergy & Immunology (Internal Medicine) Physician providers sit across 48 states; California leads with 81. Leading metros: Saint Louis, MO; Houston, TX; New York, NY; Boston, MA. Rank 317th of 688 NUCC specialties by headcount.
How does Allergy & Immunology (Internal Medicine) Physician show up in Open Payments mid-pack?
CMS Open Payments 2024 lists 321 Allergy & Immunology (Internal Medicine) Physician physicians receiving $2.4M across 10,299 payments (average $7K; 58th of 470 specialties). Not a quality score.
How much Part D prescribing does this specialty do?
Among Allergy & Immunology (Internal Medicine) Physician NPIs, 429 appear in the Medicare Part D Prescriber PUF (average 789 claims and $504K drug cost per prescriber; 113th 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.