Robert David Pfeffer, M.D.
Robert David Pfeffer is a Radiation Oncology Physician provider (Radiology) practicing in Sidney, MT, registered in the NPPES registry with NPI 1679563639 since 2005. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1679563639 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Robert David Pfeffer |
| Credential | M.D. |
| Sex | Male |
| Practice address | 216 14TH AVE SW, Sidney, MT, 59270 |
| Phone | 4064882100 |
| Enumeration date | 2005-10-21 |
| Last updated in NPPES | 2026-04-09 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 2085R0001X | Radiation Oncology Physician | Primary | MD00026712 | WA |
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 |
|---|---|---|---|
| 3255PF | Other | — | ASURIS NW HEALTH |
| KZ561 | Other | — | BLUE CROSS OF IDAHO |
| 000010150380 | Other | — | BLUE SHIELD OF IDAHO |
| 7670662 | Other | — | AETNA |
| 807071800 | Medicaid | ID | — |
| 0142238 | Other | WA | LABOR & INDUSTRIES |
| 8417248 | Medicaid | WA | — |
| P00202524 | Other | — | RAILROAD MEDICARE |
Copy-ready billing details
Provider: Robert Pfeffer, M.D. NPI: 1679563639 Taxonomy: 2085R0001X (Radiation Oncology Physician) Address: 216 14TH AVE SW, Sidney, MT, 59270
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1134111750 | James Scott | Individual | Orthopaedic Surgery Physician | Sidney, MT |
| 1184618928 | Susan Swayne | Individual | Pediatrics Physician | Sidney, MT |
| 1790771699 | Sidney Health Center | Organization | Institutional Pharmacy | Sidney, MT |
| 1295721934 | Lynn Beyerle | Individual | Pharmacist | Sidney, MT |
| 1114904976 | Shannon Shepherd | Individual | Advanced Practice Midwife | Sidney, MT |
| 1265493142 | Sidney Health Center | Organization | In Home Supportive Care Agency | Sidney, MT |
| 1932160413 | Sidney Health Center | Organization | Community Based Hospice Care Agency | Sidney, MT |
| 1336102227 | Peter Deveaux | Individual | Surgery Physician | Sidney, MT |
Verify this record
Cross-check NPI 1679563639 against the authoritative CMS record: view Robert David Pfeffer 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 2026-04-09.