NPIMap

Individual provider Active NPI

John M. Schallenkamp, MD

  • Radiation Oncology Physician
  • Billings, MT
National Provider Identifier
1265455018
Registry record updated Jul 15, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Radiation Oncology PhysicianTaxonomy code 2085R0001X
License
DR.0075716 Issued in CO
Practice address
801 N 29TH St
Billings, MT 59101-0905
Phone
(406) 238-2500
NPI assigned
Jul 25, 2006
Last updated
Jul 15, 2025By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 15, 2025

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Radiation Oncology Physician 2085R0001X 10809 MT
Radiation Oncology Physician 2085R0001X DR.0075716 CO Primary

Addresses

Primary practice location

801 N 29TH St
Billings, MT 59101-0905

Mailing address

PO Box 110429
Aurora, CO 80042-0429

Other practice location 1

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

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address jschallenkamp@billingsclinic.cernerdirect.com Direct

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MT, WY, CO3 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 3

Enrollment IDStateProvider typePAC IDDetails
I20050721000886 MT Practitioner - Radiation Oncology 5092774109 Reassigns benefits to 1 organization
I20060110000705 WY Practitioner - Radiation OncologyPractitioner - Hematology/Oncology 5092774109 Reassigns benefits to 3 organizations
I20250804000944 CO Practitioner - Radiation Oncology 5092774109 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Radiation OncologyAlso: Hematology/Oncology
Education
Medical College of Wisconsin, 2000
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices

Practice addresses (Care Compare)

214 E 23Rd St
Cheyenne, WY 82001-3748
Phone (307) 634-2273

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
83.21 of 100Reported as group
Quality
80.49
Promoting interoperability
94
Improvement activities
40
Cost
68.55

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
DR.0075716COMDRadiation Oncology Physician
10809MTMDPhysician Assistant

Practice roles

OrganizationSpecialtyStatusNew patients
Billings Clinic CurrentSince Jul 1, 2005 Accepting new patients
Memorial Hospital of Sheridan County CurrentSince Jun 17, 2014 Accepting new patients
Billings Clinic Current Accepting new patients
University Physicians, Incorporated CurrentSince Jun 5, 2025 Accepting new patients
Memorial Hospital of Laramie County CurrentSince Jul 1, 2025 Accepting new patients
Billings Clinic Express Care, LLC Current Accepting new patients
Billings Clinic Current Accepting new patients
Billings Clinic CurrentSince Oct 7, 2013 Accepting new patients
Billings Clinic CurrentSince Jul 1, 2005 Accepting new patients
Memorial Hospital of Sheridan County CurrentSince Jun 17, 2014 Accepting new patients
University Physicians Incorporated CurrentSince Jun 5, 2025 Accepting new patients
University Physicians Incorporated Current Accepting new patients
Mayo Clinic Past Accepting new patients
Frances Mahon Deaconess Hospital Past Accepting new patients

Locations

12605 E 16th Ave
Aurora, CO 80045
Phone (720) 848-0006

13123 E 16th Ave
Aurora, CO 80045
Phone (720) 777-3846

1665 Aurora Ct
Aurora, CO 80045
Phone (720) 848-0154

1665 Aurora Ct
Fl 3
Aurora, CO 80045
Phone (303) 493-7245

Dept 1061
Denver, CO 80256

2800 10th Ave N
Billings, MT 59101
Phone (406) 248-3290

801 N 29th St
Billings, MT 59101
Phone (406) 238-2210

1202 3rd St W
Roundup, MT 59072
Phone (406) 323-2301

214 E 23rd St
Cheyenne, WY 82001
Phone (307) 324-2221

201 Yellowstone Ave
Cody, WY 82414
Phone (307) 527-7561

707 Sheridan Ave
Cody, WY 82414
Phone (307) 527-7561

1401 W 5th St
Sheridan, WY 82801
Phone (307) 672-1000

Interoperability endpoints

  • Direct secure messaging: jschallenkamp@billingsclinic.cernerdirect.com

Ownership & related parties

All facility ownership & control disclosures 3

Facilities whose Medicare enrollment lists this provider’s PECOS associate ID as an owner or managing party.

FacilityTypeRoleSince
Glendive Medical Center Inc.Glendive, MT, CCN 271332 Hospital Corporate Director Oct 1, 2013
Glendive Medical Center IncGlendive, MT, CCN 27Z332 Hospital Corporate Director Aug 5, 1970
Gabert ClinicGlendive, MT, CCN 273411 Rural health clinic Corporate Director Oct 1, 2013

Owned or controlled facilities with NPI records 3

Facilities whose Medicare enrollment lists this provider as an owner, officer, director or managing party.

Organizations & group practices 14

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

View all 14

Hospital & facility affiliations 25

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

View all 25

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1153785600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1752537600000",
    "number": "1265455018",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 110429",
            "city": "AURORA",
            "state": "CO",
            "postal_code": "800420429"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "801 N 29TH ST",
            "city": "BILLINGS",
            "state": "MT",
            "postal_code": "591010905",
            "telephone_number": "406-238-2500"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1665 Aurora Ct",
            "address_purpose": "LOCATION",
            "city": "Aurora",
            "state": "CO",
            "postal_code": "800452517",
            "country_code": "US",
            "telephone_number": "720-848-0000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SCHALLENKAMP",
        "first_name": "JOHN",
        "middle_name": "M.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-25",
        "last_updated": "2025-07-15",
        "certification_date": "2025-07-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "MT",
            "license": "10809",
            "primary": false
        },
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "CO",
            "license": "DR.0075716",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "jschallenkamp@billingsclinic.cernerdirect.com",
            "affiliation": "N",
            "endpointDescription": "direct email address",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "801 N 29th St",
            "city": "Billings",
            "state": "MT",
            "country_code": "US",
            "postal_code": "591010905",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Billings, MT

Sources for this page

Verify at the official NPI Registry.