Selwyn E. Mahon, M.D.

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

1119 Issued in VI

Practice address

850 Gov. Carlos Camacho Road
Guam Memorial Hospital Authority
Tamuning, GU 96913

Phone

(671) 647-2350

NPI assigned

Aug 31, 2006

Last updated

Aug 13, 2026By the provider in NPPES

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 MD, VI, MA, RI, DC5 enrollments

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 5

Specialty

Emergency Medicine

Education

Howard University College of Medicine, 1990

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

East Harbor Partners PCGroup PAC ID 7810405966, 12 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• University of MD Shore Medical Ctr at Chestertown Hospital, Chestertown, MD, CCN 210030

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: smahon971301@direct.umm.edu

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.

• East Harbor Partners, P.C.

  • Internal Medicine Physician
  • Cambridge, MA
  • NPI 1720879844

  DC, MD, RI

  Medicare reassignment Care Compare group NPD
• Associated Physicians of Harvard Medical Faculty Physicians at Beth Is

  dba APHMFP-Emergency Medicine

  • Emergency Medical Services (Emergency Medicine) Physician
  • Boston, MA
  • NPI 1952358533
  Medicare reassignment NPD
• Chester River Hospital Center

  dba University of Maryland Shore Medical Center at Chestertown

  • General Acute Care Hospital
  • Chestertown, MD
  • NPI 1679536809
  Medicare reassignment NPD
• Emergency Associates of Woonsocket LLC

  • Emergency Medicine Physician
  • Woonsocket, RI
  • NPI 1912342528
  Medicare reassignment NPD
• Emergency Medicine Associates P.a., P.C.

  • Emergency Medicine Physician
  • Falls Church, VA
  • NPI 1134117393

  MD

  Medicare reassignment NPD
• VI Government Hospital and Health Facilities Corp

  dba Schneider Regional Medical Center

  • General Acute Care Hospital
  • St Thomas, VI
  • NPI 1487699047
  Medicare reassignment
• Associated Physicians of Harvard Medical Faculty Physicians at Beth Is

  dba Associated Physicians of HMFP

  • Multi-Specialty Clinic/Center
  • Boston, MA
  • NPI 1861216038
  NPD
• Chester River Health Center

  dba Chestertown Vascular Services

  • Clinic/Center
  • Chestertown, MD
  • NPI 1114290293
  NPD
• Emergency Medicine Associates P.a., P.C.

  • Internal Medicine Physician
  • Culpeper, VA
  • NPI 1881559102
  NPD
• Emergency Medicine Associates, PA

  • Emergency Medicine Physician
  • Aberdeen, MD
  • NPI 1609627082
  NPD
• Kent Queen Anne Pathology

  • Clinic/Center
  • Chestertown, MD
  • NPI 1871673517
  NPD
• Hospital Physician Services, LLLP

  • General Acute Care Hospital
  • Westminster, MD
  • NPI 1457302713
  NPD (past)

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

• Chester River Hospital Center

  dba University of Maryland Shore Medical Center at Chestertown

  • General Acute Care Hospital
  • Chestertown, MD
  • NPI 1679536809
  Care Compare affiliation

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

{
    "created_epoch": "1156982400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1786579200000",
    "number": "1992816169",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "6603 EVANSTON ST",
            "city": "FORESTVILLE",
            "state": "MD",
            "postal_code": "207474154",
            "telephone_number": "301-633-8820"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "850 GOV. CARLOS CAMACHO ROAD",
            "address_2": "GUAM MEMORIAL HOSPITAL AUTHORITY",
            "city": "TAMUNING",
            "state": "GU",
            "postal_code": "96913",
            "telephone_number": "671-647-2350"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "115 Cass Ave",
            "address_purpose": "LOCATION",
            "city": "Woonsocket",
            "state": "RI",
            "postal_code": "028954705",
            "country_code": "US",
            "telephone_number": "401-469-4100",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MAHON",
        "first_name": "SELWYN",
        "middle_name": "E.",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-08-31",
        "last_updated": "2026-08-13",
        "certification_date": "2026-08-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "VI",
            "license": "1119",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jean M. Macalinao
• Barbara C Mafnas, RN, MSN, IBCLC
• Marilyn Zamora Magbitang
• Edgar M. Magcalas, M.D.
• Rachel Ivy Grace Magistre-Legend, PA-C
• Janice Malilay, DDS
• Jehn Reiko Quililan Mallari
• Jonne Allen D Mallari
• Unknown Mallikarjunappa, MD
• Caressa Elisabeth Maluwelmeng, PA-C

• Emergency Medicine Physician in Tamuning, GU
• Providers in Tamuning, GU by specialty
• Emergency Medicine Physician in Guam

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 13, 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.