ROBERT DAVID PFEFFER M.D.
NPI 1679563639
Radiology - Radiation Oncology in Sidney, MT
About Robert David Pfeffer M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ROBERT DAVID PFEFFER M.D. (NPI 1679563639) is an individual radiation oncology provider in Sidney, Montana, licensed in Washington (MD00026712) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, is affiliated with Memorial Hospital, and is a graduate of University Of Washington School Of Medicine (1986).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 8
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Robert David Pfeffer M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
9Medicare enrollment records show Robert Pfeffer reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Sidney, MT 59270
- Reassigned Medicare billing, Montana enrollment
- 211 clinicians in this Medicare group
Havre, MT 59501
- Reassigned Medicare billing, Montana enrollment
- 81 clinicians in this Medicare group
Great Falls, MT 59405
- Reassigned Medicare billing, Montana enrollment
- 637 clinicians in this Medicare group
Bozeman, MT 59715
- Reassigned Medicare billing, Montana enrollment
- 402 clinicians in this Medicare group
Spokane Valley, WA 99037
- Reassigned Medicare billing, Washington enrollment
- 4,383 clinicians in this Medicare group
Wenatchee, WA 98801
- Reassigned Medicare billing, Washington enrollment
- 651 clinicians in this Medicare group
Camden, IN 46917
- Reassigned Medicare billing, Indiana enrollment
- 63 clinicians in this Medicare group
Logansport, IN 46947
- Reassigned Medicare billing, Indiana enrollment
- Medicare enrollment name: Memorial Hospital
- 90 clinicians in this Medicare group
Huntington, IN 46750
- Reassigned Medicare billing, Indiana enrollment
- 1,752 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Memorial Hospital
Acute Care Hospitals · Logansport, INSt Peters Health
Acute Care Hospitals · Helena, MTSidney Health Center
Critical Access Hospitals · Sidney, MTPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 59270 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Robert Pfeffer's NPI number?
The NPI number for Robert Pfeffer is 1679563639. It was assigned to this individual provider in the NPPES registry on October 21, 2005.
Where is Robert Pfeffer located?
Robert Pfeffer practices at 216 14th Ave SW, Sidney, MT 59270. The listed phone number is (406) 488-2100.
What is Robert Pfeffer's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.
Is Robert Pfeffer enrolled in Medicare?
Yes. Robert Pfeffer is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Robert Pfeffer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Robert Pfeffer reassigns Medicare benefits to 9 organizations: Sidney Health Center (Sidney, MT), Northern Montana Hospital (Havre, MT), Benefis Hospitals, Inc. (Great Falls, MT), Bozeman Health Deaconess Hospital (Bozeman, MT), Multicare Health System (Spokane Valley, WA) and 4 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Robert Pfeffer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Robert Pfeffer accept?
Health plans from Blue Cross and Blue Shield of Montana, CareSource, Mountain Health CO-OP, Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Robert Pfeffer as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Robert Pfeffer affiliated with any hospitals?
According to CMS data, Robert Pfeffer is affiliated with Memorial Hospital, St Peters Health and Sidney Health Center.
When was this NPI record last updated?
The NPPES record for Robert Pfeffer was last updated on April 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Robert David Pfeffer, M.D. · NPI 1679563639
Radiation Oncology physician in Sidney, Montana. Individual provider, active in the CMS NPPES registry since October 21, 2005.
## Identity
- **NPI:** 1679563639 (Entity type: Individual)
- **Enumerated:** October 21, 2005
- **Primary specialty:** Radiology - Radiation Oncology · taxonomy 2085R0001X
- **State license:** MD00026712 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 216 14TH AVE SW, Sidney, MT 59270-3519
- **Phone:** (406) 488-2100
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 9 organizations under Medicare reassignment (form CMS-855R): Sidney Health Center (NPI 1285719161, Sidney, MT); Northern Montana Hospital (NPI 1538131172, Havre, MT); Benefis Hospitals, Inc. (NPI 1881650737, Great Falls, MT); Bozeman Health Deaconess Hospital (NPI 1437529112, Bozeman, MT); Multicare Health System (NPI 1336902345, Spokane Valley, WA); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Washington School Of Medicine, class of 1986
## Record status
- **NPPES last updated:** April 9, 2026
- **Other identifiers:** Other 3255PF; Other KZ561; Other 000010150380; and 5 more
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Source: [NPI Profile](https://npiprofile.com/npi/1679563639) · Data from the CMS NPPES public registry.