Allopathic & Osteopathic Physicians / 207RG0100X
Individual · specialization · Medicare specialty 10
207RG0100X Gastroenterology Physician
207RG0100X is the taxonomy code for Gastroenterology, a specialization of Internal Medicine, in the NUCC group “Allopathic & Osteopathic Physicians”. It is a code for individual providers — the kind used on a Type 1 NPI. Medicare maps it to specialty 10, Physician/Gastroenterology, under which 18,108 practitioners are enrolled, and to 1 other specialty listed below.
- 1Taxonomy code 207RG0100X
- 2Level Specialization
- 3Medicare specialty 10 Physician/Gastroenterology
- 4Codes in this group 238
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 207RG0100X sits
- Group: Allopathic & Osteopathic Physicians — code 54 of 238 in the group
- Classification: Internal Medicine 207R00000X
- Specialization: Gastroenterology 207RG0100X
Choose 207RG0100X over the general Internal Medicine code (207R00000X) when the provider's training or certification is specifically in gastroenterology; the general code covers the classification as a whole. A provider may report more than one taxonomy code on an NPI but marks one as primary.
Medicare
CMS's taxonomy crosswalk links 207RG0100X to Medicare specialty 10 (Physician/Gastroenterology) and Medicare specialty 11 (Physician/Internal Medicine). That specialty — not the taxonomy code itself — is what Medicare enrollment records and uses for payment. 18,108 practitioners are enrolled under it nationally, and 25 other taxonomy codes map to the same specialty.
Other codes under the same Medicare specialty: 207QB0505X Diabetology (Internal Medicine) Physician; 207R00000X Internal Medicine Physician; 207RA0000X Adolescent Medicine (Internal Medicine) Physician; 207RA0001X Advanced Heart Failure and Transplant Cardiology Physician; 207RA0201X Allergy & Immunology (Internal Medicine) Physician; 207RA0401X Addiction Medicine (Internal Medicine) Physician; 207RB0002X Obesity Medicine (Internal Medicine) Physician; 207RC0000X Cardiovascular Disease Physician; and 17 more.
Related codes
| Code | Internal Medicine — other specializations |
|---|---|
| 207RC0200X | Critical Care Medicine |
| 207QB0505X | Diabetology |
| 207RE0101X | Endocrinology, Diabetes & Metabolism |
| 207RG0300X | Geriatric Medicine |
| 207RH0000X | Hematology |
| 207RH0003X | Hematology & Oncology |
The nearest 6 of 30 other codes under Internal Medicine; all are on the group page.
History of 207RG0100X
NUCC's earliest recorded change to 207RG0100X is from 2007 (added definition, added source), and has been revised 1 time since.
- 2007-07-01 — added definition, added source
- 2011-07-01 — modified source
Similar codes in other groups
If 207RG0100X is not quite right, these codes in other groups share a word with it — often the same field practised by a different kind of provider:
- 163WG0100X Gastroenterology Registered Nurse (Nursing Service Providers)
Find providers with 207RG0100X
Using 207RG0100X
The code goes in the taxonomy field of the NPI application in NPPES, and on claims where a payer asks for it — box 24J (shaded) or 33b on the CMS-1500 with the ZZ qualifier, or the PRV segment of an 837 electronic claim. Payers match it against the taxonomy on the NPI record and, for Medicare, against the specialty on the enrollment, so all three should agree. To see which code a provider uses, search their NPI in the lookup.
Sources: NUCC Health Care Provider Taxonomy code set, version 26.1 (CSV); CMS Medicare Provider and Supplier Taxonomy Crosswalk, August 2026; CMS Medicare Fee-For-Service Public Provider Enrollment, extract of 2026-09-29. Checked 2026-10-24. Methodology.