John R. Gregory, MD
John R. Gregory is a Surgery Physician provider (Surgery) practicing in Billings, MT, registered in the NPPES registry with NPI 1861504847 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1861504847 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | John R. Gregory |
| Credential | MD |
| Sex | Male |
| Practice address | 801 N 29TH ST, Billings, MT, 59101 |
| Phone | 4062382500 |
| Enumeration date | 2006-08-31 |
| Last updated in NPPES | 2022-02-10 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 208600000X | Surgery Physician | Primary | 4284 | MT |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 000017290 | Other | MT | BCBS PIN |
| 0109446 | Other | MT | MDCD PIN |
Copy-ready billing details
Provider: John Gregory, MD NPI: 1861504847 Taxonomy: 208600000X (Surgery Physician) Address: 801 N 29TH ST, Billings, MT, 59101
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1073516167 | Linda Dupree | Individual | Physician Assistant | Billings, MT |
| 1417951922 | Luis Alvarez | Individual | Clinical Cardiac Electrophysiology Physician | Billings, MT |
| 1811981699 | Dennis Obrien | Individual | Neurology Physician | Billings, MT |
| 1568456044 | Jodee Macdonald Etchart | Individual | Medical Physician Assistant | Billings, MT |
| 1215921838 | Brooke Yates | Individual | Physician Assistant | Billings, MT |
| 1952397929 | Emily Colson | Individual | Family Medicine Physician | Billings, MT |
| 1184612715 | Richard Leblond | Individual | Internal Medicine Physician | Billings, MT |
| 1841289410 | Lawrence Zyskowski | Individual | Rheumatology Physician | Billings, MT |
Verify this record
Cross-check NPI 1861504847 against the authoritative CMS record: view John R. Gregory on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2022-02-10.