A fast, free, no-login way to look up any U.S. healthcare provider in the federal NPPES registry.

Lookups

NPI Lookup
NPI Registry
By Specialty
By State

Resources

Guides
For Providers / API
Data Sources
About

Legal

Privacy
Terms
Correct a record

Data is sourced from the public NPPES (National Plan and Provider Enumeration System) registry published by CMS. NPI Central is not affiliated with, or endorsed by, CMSor any healthcare provider. Information is provided “as is” for general reference and is not medical advice.

FCRA notice: NPI Central is not a consumer reporting agency. This information may not be used to determine eligibility for employment, credentialing, insurance, or any other purpose covered by the Fair Credit Reporting Act.

© 2026 NPI Central. All rights reserved.

John Schallenkamp, MD — NPI 1265455018, Billings, MT | NPI Central

Home/
NPI Lookup/
MT/
NPI 1265455018

IndividualActive

John Schallenkamp, MD

NPI 1265455018 · Radiation Oncology Physician · Billings, MT

Provider details

NPI number: 1265455018
Entity type: Individual
Primary specialty: Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Male
Sole proprietor: No
License: 10809 (MT)

Specialties & taxonomies

Radiation Oncology PhysicianPrimary2085R0001XLicense DR.0075716 (CO)
Allopathic & Osteopathic Physicians
Radiation Oncology Physician2085R0001XLicense 10809 (MT)
Allopathic & Osteopathic Physicians

Practice location

801 N 29th St

Billings, MT 59101-0905

Phone: (406) 238-2500

Approximate (ZIP-level) locationGet directions

More MT providers

Mailing address

Po Box 110429

Aurora, CO 80042-0429

Additional practice locations (1)

1665 Aurora Ct
Aurora, CO 80045-2517
Phone: (720) 848-0000

Registry dates

Enumerated: 2006-07-25
Last updated: 2025-07-15
Certified: 2025-07-15

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.