Christopher M Callahan, MD

Primary specialty

Geriatric Medicine (Internal Medicine) PhysicianTaxonomy code 207RG0300X

License

01036319A Issued in IN

Practice address

1633 N Capitol Ave
Ste 322
Indianapolis, IN 46202-1476

Phone

(317) 962-2929

Fax

(317) 962-2070

NPI assigned

Jun 10, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other identifiers 2

Electronic endpoints 2

Medicare fee-for-service enrollment

Enrolled in IN

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: ccallahan14098@direct.eskenazihealth.edu

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

• Eskenazi Medical Group Inc

  • Adult Medicine Physician
  • Indianapolis, IN
  • NPI 1730451063

  Internal Medicine

  Medicare reassignment NPD
• Indiana University Health Care Associates, Inc

  • General Practice Physician
  • Indianapolis, IN
  • NPI 1902032832
  Medicare reassignment NPD
• The Health and Hospital Corporation of Marion County

  • Nurse Practitioner
  • Indianapolis, IN
  • NPI 1104027879
  Medicare reassignment NPD
• Indiana University Health Care Associates, Inc.

  • Registered Dietitian
  • Indianapolis, IN
  • NPI 1679949002
  NPD
• The Health and Hospital Corporation of Marion County

  • Federally Qualified Health Center (FQHC)
  • Indianapolis, IN
  • NPI 1083953442
  NPD
• The Health and Hospital Corporation of Marion County

  • Mental Health Clinic/Center (Including Community Mental Health Center)
  • Indianapolis, IN
  • NPI 1871311779
  NPD
• Indiana University Health, Inc

  • Cardiovascular Disease Physician
  • Indianapolis, IN
  • NPI 1376586719

  Geriatric Medicine

  NPD (past)
• University Medical Diagnostic Associates, Inc.

  • Internal Medicine Physician
  • Indianapolis, IN
  • NPI 1861441537
  NPD (past)

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

{
    "created_epoch": "1149897600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757894400000",
    "number": "1104867043",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "250 N SHADELAND AVE",
            "city": "INDIANAPOLIS",
            "state": "IN",
            "postal_code": "462194959"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1633 N CAPITOL AVE",
            "address_2": "STE 322",
            "city": "INDIANAPOLIS",
            "state": "IN",
            "postal_code": "462021476",
            "telephone_number": "317-962-2929",
            "fax_number": "317-962-2070"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "720 Eskenazi Ave",
            "address_purpose": "LOCATION",
            "city": "Indianapolis",
            "state": "IN",
            "postal_code": "462025187",
            "country_code": "US",
            "telephone_number": "317-880-7666",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "CALLAHAN",
        "first_name": "CHRISTOPHER",
        "middle_name": "M",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-10",
        "last_updated": "2025-09-15",
        "certification_date": "2025-09-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0300X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Geriatric Medicine",
            "state": "IN",
            "license": "01036319A",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IN",
            "license": "01036319A",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "ANTHEM",
            "identifier": "000000086850",
            "state": "IN"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "100068500",
            "state": "IN"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "ccallah1@direct.iuhealth.org",
            "affiliation": "N",
            "address_1": "1633 N Capitol Ave",
            "address_2": "Ste 322",
            "city": "Indianapolis",
            "state": "IN",
            "country_code": "US",
            "postal_code": "462021476",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "ccallahan14098@direct.eskenazihealth.edu",
            "affiliation": "N",
            "address_1": "720 Eskenazi Ave",
            "city": "Indianapolis",
            "state": "IN",
            "country_code": "US",
            "postal_code": "462025187",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Paul M Calkins, MD
• Nicole Marie Call, FNP
• Zoe Call, P.A.
• John Thomas Callaghan, MD, PHD
• Casey Joanne Callahan
• Cierra Dienne Callahan
• Kyle M Callahan
• Lauren Amanda Callahan
• Michael Callahan, MD
• Nickolaus Anthony Callas

• Geriatric Medicine (Internal Medicine) Physician in Indianapolis, IN
• Providers in Indianapolis, IN by specialty
• Geriatric Medicine (Internal Medicine) Physician in Indiana

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 15, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.