Gregory Mark Mathien, M.D.

Primary specialty

Sports Medicine (Orthopaedic Surgery) PhysicianTaxonomy code 207XX0005X

License

21414 Issued in TN

Practice address

1422 Old Weisgarber Rd
Knoxville, TN 37909-1293

Phone

(865) 558-4400

Fax

(865) 558-4471

NPI assigned

Mar 7, 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 10

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

Sports MedicineAlso: Orthopedic Surgery

Education

State University of Ny Upstate Medical University, 1986

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Orthotennessee PCGroup PAC ID 3476453572, 152 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Parkwest Medical Center Hospital, Knoxville, TN, CCN 440173
• Physicians Regional Medical Center Hospital, Powell, TN, CCN 440120

Merit-based Incentive Payment System (MIPS)

Final score

85.88 of 100Reported as group

Quality

81.99

Promoting interoperability

100

Improvement activities

40

Cost

70.94

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: gregory.mathien.p1@direct.orthotn.nextgenshare.com
• FHIR API: https://fhir.nextgen.com/nge/prod/fhir-api-r4/fhir/r4/
• Direct secure messaging: gmathien872735@direct.ghs.myhfn.org

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.

• Orthotennessee, PC

  • Multi-Specialty Clinic/Center
  • Knoxville, TN
  • NPI 1518049592
  Medicare reassignment Care Compare group NPD
• Orthotennessee, PC

  • Durable Medical Equipment & Medical Supplies
  • Sevierville, TN
  • NPI 1013450360

  Orthopaedic Surgery

  NPD
• Orthotennessee, PC

  • Orthopaedic Surgery Physician
  • Morristown, TN
  • NPI 1194816983
  NPD
• Hovis Orthopaedic Clinic PC

  • Orthopaedic Surgery Physician
  • Knoxville, TN
  • NPI 1053392043
  NPD (past)
• Orthotennessee

  • Multi-Specialty Clinic/Center
  • Knoxville, TN
  • NPI 1841508751
  NPD (past)
• Orthotennessee, PC

  • Orthopaedic Surgery Physician
  • Knoxville, TN
  • NPI 1053402040
  NPD (past)
• Orthotennessee, PC

  • Multi-Specialty Clinic/Center
  • Powell, TN
  • NPI 1518043751
  NPD (past)
• Orthotennessee, PC

  • Multi-Specialty Clinic/Center
  • Knoxville, TN
  • NPI 1669554549
  NPD (past)

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

• Metro Knoxville Hma LLC

  • General Acute Care Hospital
  • Powell, TN
  • NPI 1043292899
  Care Compare affiliation
• Parkwest Medical Center

  • General Acute Care Hospital
  • Knoxville, TN
  • NPI 1396739165
  Care Compare affiliation

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

{
    "created_epoch": "1141689600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1768435200000",
    "number": "1730156076",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "8320 E WALKER SPRINGS LN STE 200",
            "city": "KNOXVILLE",
            "state": "TN",
            "postal_code": "379233120",
            "telephone_number": "865-769-4500",
            "fax_number": "865-769-4501"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1422 OLD WEISGARBER RD",
            "city": "KNOXVILLE",
            "state": "TN",
            "postal_code": "379091293",
            "telephone_number": "865-558-4400",
            "fax_number": "865-558-4471"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MATHIEN",
        "first_name": "GREGORY",
        "middle_name": "MARK",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-03-07",
        "last_updated": "2026-01-15",
        "certification_date": "2026-01-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207XX0005X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery, Sports Medicine",
            "state": "TN",
            "license": "21414",
            "primary": true
        },
        {
            "code": "207X00000X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery",
            "state": "TN",
            "license": "MD21414",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "JOHN DEERE HEALTHCARE",
            "identifier": "TN0120",
            "state": "TN"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "TENNCARE",
            "identifier": "100010064",
            "state": "TN"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "UNITED HEALTH CARE",
            "identifier": "1196196",
            "state": "TN"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "JOHN DEERE HEALTHCARE",
            "identifier": "TN0152",
            "state": "TN"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "3059706",
            "state": "TN"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "AETNA",
            "identifier": "4397728",
            "state": "TN"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "200030088",
            "state": "TN"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BLUE CROSS BLUE SHIELD",
            "identifier": "3071385",
            "state": "TN"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "TRICARE",
            "identifier": "098041241",
            "state": "TN"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "P00910368",
            "state": "TN"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Christina Mathew, PHARMD
• David Varkey Mathews, M.D.
• Kellie L Mathewson, NP
• Leslie A. Mathewson, APN (PMHNP)
• Jennifer Lynn Mathiak
• Amanda Mathieu
• Bradley Lamar Mathis
• Rachel H Mathis, M.D.
• Sarah R Mathis, RD
• Brandi K Matson, LPC

• Sports Medicine (Orthopaedic Surgery) Physician in Knoxville, TN
• Providers in Knoxville, TN by specialty
• Sports Medicine (Orthopaedic Surgery) Physician in Tennessee

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 15, 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.