JOHN C SILLERY M.D.
NPI 1699752709
Radiology - Diagnostic Radiology in Billings, MT
About John C Sillery M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN C SILLERY M.D. (NPI 1699752709) is an individual diagnostic radiology provider in Billings, Montana, licensed in Montana (11712) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, is affiliated with Billings Clinic, and maintains a secondary practice location in Glendive.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
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
John C Sillery 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
20Medicare enrollment records show John Sillery reassigns Medicare billing to 20 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Billings, MT 59101
- Reassigned Medicare billing, Montana and Wyoming enrollments
- Also billed through NPI 1346288347 (Wyoming)
- 1,264 clinicians in this Medicare group
Columbus, MT 59019
- Reassigned Medicare billing, Montana enrollment
- 86 clinicians in this Medicare group
Hardin, MT 59034
- Reassigned Medicare billing, Montana enrollment
- 53 clinicians in this Medicare group
Roundup, MT 59072
- Reassigned Medicare billing, Montana enrollment
- Also billed through NPI 1386751196 (Montana)
- 39 clinicians in this Medicare group
Red Lodge, MT 59068
- Reassigned Medicare billing, Montana enrollment
- Also billed through NPI 1184785099 (Montana)
- 61 clinicians in this Medicare group
Lovell, WY 82431
- Reassigned Medicare billing, Wyoming enrollment
- Also billed through NPI 1750485793 (Wyoming)
- 50 clinicians in this Medicare group
Big Timber, MT 59011
- Reassigned Medicare billing, Montana enrollment
- Also billed through NPI 1003939190 (Montana)
- 28 clinicians in this Medicare group
Powell, WY 82435
- Reassigned Medicare billing, Wyoming enrollment
- Also billed through NPI 1497753115 (Wyoming)
- 61 clinicians in this Medicare group
Harlowton, MT 59036
- Reassigned Medicare billing, Montana enrollment
- 24 clinicians in this Medicare group
Colstrip, MT 59323
- Reassigned Medicare billing, Montana enrollment
- 19 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 39
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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Billings Clinic
Acute Care Hospitals · Billings, MTLivingston Healthcare
Critical Access Hospitals · Livingston, MTSheridan Memorial Hosptial
Critical Access Hospitals · Plentywood, MTGlendive Medical Center
Critical Access Hospitals · Glendive, MTDaniels Memorial Hospital
Critical Access Hospitals · Scobey, MTPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 59101 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.
BILLINGS, MT 59101
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 John Sillery's NPI number?
The NPI number for John Sillery is 1699752709. It was assigned to this individual provider in the NPPES registry on December 29, 2005.
Where is John Sillery located?
John Sillery practices at 2800 10th Ave N, Billings, MT 59101. The listed phone number is (406) 238-2500.
What is John Sillery's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is John Sillery enrolled in Medicare?
Yes. John Sillery 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 John Sillery's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Sillery reassigns Medicare benefits to 20 organizations: Billings Clinic (Billings, MT), Stillwater Hospital Association, Inc. (Columbus, MT), Big Horn Hospital Association (Hardin, MT), Roundup Memorial Hospital Association (Roundup, MT), Memorial Hospital Association (Red Lodge, MT) and 15 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 John Sillery's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Sillery accept?
Health plans from Blue Cross Blue Shield of Wyoming, Blue Cross and Blue Shield of Montana and Mountain Health CO-OP list John Sillery 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 John Sillery affiliated with any hospitals?
According to CMS data, John Sillery is affiliated with Billings Clinic, Livingston Healthcare, Sheridan Memorial Hosptial, Glendive Medical Center and Daniels Memorial Hospital.
When was this NPI record last updated?
The NPPES record for John Sillery was last updated on January 3, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.
# John C Sillery, M.D. · NPI 1699752709
Diagnostic Radiology physician in Billings, Montana. Individual provider, active in the CMS NPPES registry since December 29, 2005.
## Identity
- **NPI:** 1699752709 (Entity type: Individual)
- **Enumerated:** December 29, 2005
- **Primary specialty:** Radiology - Diagnostic Radiology · taxonomy 2085R0202X
- **State license:** 11712 (Montana)
- **Sole proprietor:** No
## Practice location
- **Address:** 2800 10TH AVE N, Billings, MT 59101-0703
- **Phone:** (406) 238-2500
## 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:** 20 organizations under Medicare reassignment (form CMS-855R): Billings Clinic (NPI 1326104845, Billings, MT); Stillwater Hospital Association, Inc. (NPI 1053488387, Columbus, MT); Big Horn Hospital Association (NPI 1891713533, Hardin, MT); Roundup Memorial Hospital Association (NPI 1902908262, Roundup, MT); Memorial Hospital Association (NPI 1336119338, Red Lodge, MT); and 15 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2004
## Record status
- **NPPES last updated:** January 3, 2022
- **Other identifiers:** Medicaid 430077700 (MN)
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Source: [NPI Profile](https://npiprofile.com/npi/1699752709) · Data from the CMS NPPES public registry.