Matthew Thomas Middendorf, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

MD39270 Issued in SC

Practice address

Farenholt Ave. BLDG. 50
Agana Heights, GU 96910

Phone

(671) 344-9340

NPI assigned

Nov 11, 2009

Last updated

Oct 1, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 7

Addresses

Medicare fee-for-service enrollment

Enrolled in GU

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

Pulmonary DiseaseAlso: Critical Care (Intensivists)

Education

Mercer University School of Medicine, 2013

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Guam Healthcare Development IncorporatedGroup PAC ID 9234351776, 211 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Guam Regional Medical City Hospital, Dededo, GU, CCN 650003

Merit-based Incentive Payment System (MIPS)

Final score

79.22 of 100Reported as group

Quality

78.84

Improvement activities

40

Cost

61.61

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

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.

• Guam Healthcare Development Incorporated

  dba GRMC Specialty Care Center

  • Clinic/Center
  • Dededo, GU
  • NPI 1326447939
  Medicare reassignment Care Compare group NPD

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

• Guam Healthcare Development Incorporated

  dba Guam Regional Medical City

  • General Acute Care Hospital
  • Dededo, GU
  • NPI 1194159525
  Care Compare affiliation

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

{
    "created_epoch": "1257897600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1759276800000",
    "number": "1629305784",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "MIL",
            "address_1": "PSC 455 BOX 208",
            "city": "FPO",
            "state": "AP",
            "postal_code": "965400003",
            "telephone_number": "706-296-3552"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "FARENHOLT AVE. BLDG. 50",
            "city": "AGANA HEIGHTS",
            "state": "GU",
            "postal_code": "96910",
            "telephone_number": "671-344-9340"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "320 E 50th St",
            "address_purpose": "LOCATION",
            "city": "Savannah",
            "state": "GA",
            "postal_code": "314052238",
            "country_code": "US",
            "telephone_number": "706-296-3552",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MIDDENDORF",
        "first_name": "MATTHEW",
        "middle_name": "THOMAS",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2009-11-11",
        "last_updated": "2025-10-01",
        "certification_date": "2025-10-01",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "SC",
            "license": "MD39270",
            "primary": true
        },
        {
            "code": "207RC0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Critical Care Medicine",
            "state": "GU",
            "license": "M-2396",
            "primary": false
        },
        {
            "code": "207RC0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Critical Care Medicine",
            "state": "GU",
            "license": "MD-P-2025-007",
            "primary": false
        },
        {
            "code": "207RC0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Critical Care Medicine",
            "state": "SC",
            "license": "MD39270",
            "primary": false
        },
        {
            "code": "207RP1001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Pulmonary Disease",
            "state": "GU",
            "license": "M-2396",
            "primary": false
        },
        {
            "code": "207RP1001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Pulmonary Disease",
            "state": "GU",
            "license": "MD-P-2025-007",
            "primary": false
        },
        {
            "code": "207RP1001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Pulmonary Disease",
            "state": "SC",
            "license": "MD39270",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Conor Flynn McCarthy, MD
• Charles Wynter McCready III, IDC
• Thomas Patrick McDonald, MD
• Myra M McGowan, PT, DPT
• Joshua Medlin, CRNA
• Frederic Baker Mills IV, MD, MS
• Brenda Sue Morgan, APRN
• Rachelle Bumagat Natividad, RN
• Jaclyn Victoria Nebzydoski
• NH Guam (Dod Naval Hospital Guam Pharmacy)

• Internal Medicine Physician in Agana Heights, GU
• Providers in Agana Heights, GU by specialty
• Internal Medicine Physician in Guam

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 1, 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.
• 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.