John David Mayfield, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

LL82596 Issued in SC

Practice address

55 Fruit St
Boston, MA 02114-2621

Phone

(617) 726-8323

NPI assigned

Jun 4, 2019

Sex

Male

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in MA, NH2 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 2

Specialty

Diagnostic Radiology

Education

University of Florida College of Medicine, 2019

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Dartmouth-Hitchcock ClinicGroup PAC ID 4183537509, shared by 2 NPIs, 1,445 clinicians

Massachusetts General Physicians Organization IncGroup PAC ID 2466365820, 3,494 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Massachusetts General Hospital Hospital, Boston, MA, CCN 220071
• Mary Hitchcock Memorial Hospital Hospital, Lebanon, NH, CCN 300003
• Newton-Wellesley Hospital Hospital, Newton, MA, CCN 220101
• Martha'S Vineyard Hospital Inc Hospital, Oak Bluffs, MA, CCN 221300
• Wentworth-Douglass Hospital Hospital, Dover, NH, CCN 300018

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mayfield.john.mgh@direct.partners.masshiway.net

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.

• Massachusetts General Physicians Organization Inc

  • Dermatology Physician
  • Boston, MA
  • NPI 1801874573

  Internal Medicine, NH

  Medicare reassignment Care Compare group NPD
• The General Hospital Corporation

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1023049236
  Medicare reassignment NPD
• General Hospital Corp

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1508390014
  NPD

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

• Martha'S Vineyard Hospital, Inc.

  • Critical Access Hospital
  • Oak Bluffs, MA
  • NPI 1134206386
  Care Compare affiliation
• Newton-Wellesley Hospital

  • General Acute Care Hospital
  • Newton, MA
  • NPI 1992737761
  Care Compare affiliation
• The General Hospital Corporation

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1023049236
  Care Compare affiliation
• Mary Hitchcock Memorial Hospital

  • General Acute Care Hospital
  • Lebanon, NH
  • NPI 1023092053
  Care Compare affiliation
• Mary Hitchcock Memorial Hospital

  • General Acute Care Hospital
  • Lebanon, NH
  • NPI 1629788237
  Care Compare affiliation
• Wentworth Douglass Hospital

  • General Acute Care Hospital
  • Dover, NH
  • NPI 1033118104
  Care Compare affiliation
• Wentworth Douglass Hospital

  • Diabetes Educator Registered Nurse
  • Dover, NH
  • NPI 1407385198

  Hospital

  Care Compare affiliation

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

{
    "created_epoch": "1559606400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1781136000000",
    "number": "1669030722",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "701 GROVE RD",
            "city": "GREENVILLE",
            "state": "SC",
            "postal_code": "296054210",
            "telephone_number": "864-455-7882"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "55 FRUIT ST",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021142621",
            "telephone_number": "617-726-8323"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "701 Grove Rd",
            "address_purpose": "LOCATION",
            "city": "Greenville",
            "state": "SC",
            "postal_code": "296054210",
            "country_code": "US",
            "telephone_number": "864-455-7882",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1 Medical Center Dr",
            "address_purpose": "LOCATION",
            "city": "Lebanon",
            "state": "NH",
            "postal_code": "037560001",
            "country_code": "US",
            "telephone_number": "603-650-5000",
            "fax_number": "603-640-1228",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MAYFIELD",
        "first_name": "JOHN",
        "middle_name": "DAVID",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-06-04",
        "last_updated": "2026-06-11",
        "certification_date": "2026-06-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "MA",
            "license": "1017847",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "SC",
            "license": "LL82596",
            "primary": true
        },
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "NH",
            "license": "33181",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Lauren Mayer, MS, RDN, LDN
• Robert Glenn Mayer, MD
• Robert James Mayer, MD
• Selena Mayer, AUD
• Alishya Nicole Mayfield, M.D.
• Catherine Elizabeth Mayhew, PSY.D.
• David Lawrence Mayhew, M.D.
• Kevin Alberto Maymi-Quintana
• Alyssa Emma Maymi, PA-C
• Jennifer L Maynard

• Internal Medicine Physician in Boston, MA
• Providers in Boston, MA by specialty
• Internal Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 11, 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.