Gregory Sean Hadfield, PA-C

Primary specialty

Medical Physician AssistantTaxonomy code 363AM0700X

License

P-16311 Issued in CA

Practice address

475 N Forbes St Ste B
Lakeport, CA 95453-4725

Phone

(707) 606-6366

NPI assigned

May 24, 2009

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 CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Physician Assistant

Education

Other, 2001

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Eye Associates of Sebastopol Medical GroupGroup PAC ID 1052362696, 7 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Adventist Health Clearlake Hospital, Clearlake, CA, CCN 051317

Merit-based Incentive Payment System (MIPS)

Final score

84.82 of 100Reported as group

Quality

96.29

Improvement activities

40

Cost

54.36

Merit-based Incentive Payment System (MIPS)

Final score

97.16 of 100Reported as group

Quality

91.91

Improvement activities

40

Cost

79.27

Medicare enrollment (NPD)

Not enrolled

HHS exclusion list flag

Flagged The directory lists this NPI on an HHS exclusion list. The OIG exclusions file (LEIE) holds no record for this NPI, and the directory does not say which list the flag comes from. How exclusions are shown Confirm with the OIG exclusions search.

Credentials

Physician Assistant

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: ghadfield@eas.emadirect.md

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.

• Eye Associates of Sebastopol Medical Group Inc

  • Ophthalmology Physician
  • Sebastopol, CA
  • NPI 1295729382
  Medicare reassignment Care Compare group
• Integrated Dermatology of Lakeport, PC

  • Dermatology Physician
  • Lakeport, CA
  • NPI 1295276962
  Medicare reassignment
• San Francisco Emergency Medical Associates

  • Emergency Medicine Physician
  • San Francisco, CA
  • NPI 1134110661
  Medicare reassignment
• Eye Associates of Sebastopol Medical Group

  • Eyewear Supplier
  • Sebastopol, CA
  • NPI 1619012119
  NPD
• Lake Dermatology Medical Assoc Inc

  • Dermatology Physician
  • Lakeport, CA
  • NPI 1437346657
  NPD (past)

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

• Adventist Health Clearlake Hospital Inc.

  • Critical Access Hospital
  • Clearlake, CA
  • NPI 1124018031
  Care Compare affiliation

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

{
    "created_epoch": "1243123200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1788480000000",
    "number": "1285869966",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "475 N FORBES ST STE B",
            "city": "LAKEPORT",
            "state": "CA",
            "postal_code": "954534725",
            "telephone_number": "760-709-1255"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "475 N FORBES ST STE B",
            "city": "LAKEPORT",
            "state": "CA",
            "postal_code": "954534725",
            "telephone_number": "707-606-6366"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HADFIELD",
        "first_name": "GREGORY",
        "middle_name": "SEAN",
        "name_prefix": "Mr.",
        "credential": "PA-C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2009-05-24",
        "last_updated": "2026-09-04",
        "certification_date": "2026-09-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363AM0700X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Medical",
            "state": "CA",
            "license": "P-16311",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jaimee Gronendyke, MHRS
• Linda Gude, PSY.D
• Kimbralee Guerra, REHAB SPECIALIST
• Diane Gunther, RN
• Christian Hackshaw, M.D.
• James M Hagan, DPM
• Jodi Hansen
• Katherine Claire Harris, PUBLIC HEALTH NURSE
• Laura Ann Harris
• Lori Heagerty, LMFT

• Medical Physician Assistant in Lakeport, CA
• Providers in Lakeport, CA by specialty
• Medical Physician Assistant in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 4, 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.