Zachary Callahan, M.D.

Primary specialty

Surgery PhysicianTaxonomy code 208600000X

License

66510 Issued in TN

Practice address

410 42ND Ave N Ste 400
Nashville, TN 37209-3658

Phone

(615) 329-7887

Fax

(615) 340-4537

NPI assigned

Apr 13, 2015

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in TN

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

Specialty

General Surgery

Education

University of Cincinnati College of Medicine, 2015

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Tennessee Oncology PLLCGroup PAC ID 4688586134, 355 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Ascension Saint Thomas Hospital Hospital, Nashville, TN, CCN 440082
• Tristar Centennial Medical Center Hospital, Nashville, TN, CCN 440161

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: zachary.callahan@ahp.eclinicaldirectplus.com

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.

• Tennessee Oncology PLLC

  • Hematology & Oncology Physician
  • Nashville, TN
  • NPI 1811955917

  Surgery

  Medicare reassignment Care Compare group NPD
• Advanced Diagnostic Imaging PC

  • Durable Medical Equipment & Medical Supplies
  • Lewisburg, TN
  • NPI 1922846559
  NPD
• Advanced Diagnostic Imaging, PC

  • Internal Medicine Physician
  • Goodlettsville, TN
  • NPI 1093741464
  NPD

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

• HCA Health Services of Tennessee, Inc.

  • General Acute Care Hospital
  • Nashville, TN
  • NPI 1023055126
  Care Compare affiliation
• Saint Thomas West Hospital

  • General Acute Care Hospital
  • Nashville, TN
  • NPI 1629025648
  Care Compare affiliation

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

{
    "created_epoch": "1428883200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767571200000",
    "number": "1679969067",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "410 42ND AVE N STE 400",
            "city": "NASHVILLE",
            "state": "TN",
            "postal_code": "372093658",
            "telephone_number": "615-329-7887",
            "fax_number": "615-340-4537"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "410 42ND AVE N STE 400",
            "city": "NASHVILLE",
            "state": "TN",
            "postal_code": "372093658",
            "telephone_number": "615-329-7887",
            "fax_number": "615-340-4537"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CALLAHAN",
        "first_name": "ZACHARY",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2015-04-13",
        "last_updated": "2026-01-05",
        "certification_date": "2026-01-05",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "TN",
            "license": "66510",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Clay Weldon Callahan, DPT
• Jordan Callahan, CPM-TN
• Laurie Callahan
• Marguerite Esther Callahan, APN
• Stephen Todd Callahan, MD, MPH
• Mark Leipham Callanen, DPT
• Carol Lynn Callaway-Lane, RN,MSN,CS,ACNP
• Carrie Catherine Callaway, LCSW
• Christine Callaway, COTA
• Huston Callaway, D.C.

• Surgery Physician in Nashville, TN
• Providers in Nashville, TN by specialty
• Surgery Physician in Tennessee

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 5, 2026; 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.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.