Brian L. Gretta, M.D.

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

MD13084 Issued in ME

Practice address

1 Parkland Dr
Derry, NH 03038-2746

Phone

(207) 794-3321

NPI assigned

Dec 15, 2005

Sex

Male

Sole proprietor

Yes

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 ME, GA, NH3 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 3

Specialty

Internal MedicineAlso: Emergency Medicine

Education

Other, 1986

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Emergency Medicine Services of NH, LLCGroup PAC ID 3173988474, 66 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Parkland Medical Center Hospital, Derry, NH, CCN 300017
• Liberty Regional Medical Center Hospital, Hinesville, GA, CCN 111335
• Portsmouth Regional Hospital Hospital, Portsmouth, NH, CCN 300029

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://api.platform.athenahealth.com/5664/brand/1/csg/1/fhir/r4
• FHIR API: https://api.platform.athenahealth.com/14272/brand/70/csg/1/fhir/r4
• FHIR API: https://fhir-usa.unify.chbase.com/org/penob-eadbba22
• Direct secure messaging: bgretta@yourcarecommunity.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.

• Emergency Medicine Services of NH, LLC

  • Emergency Medicine Physician
  • Derry, NH
  • NPI 1386341444
  Medicare reassignment Care Compare group NPD
• Emergency Coverage, LLC

  • Family Medicine Physician
  • Newport, TN
  • NPI 1427005008

  Emergency Medicine, GA

  Medicare reassignment NPD
• Emergency Medicine Services of Maine, LLC

  • Emergency Medicine Physician
  • Ellsworth, ME
  • NPI 1578032058
  Medicare reassignment NPD
• Emergency Physicians of Forsyth, PC

  • Emergency Medicine Physician
  • Forsyth, GA
  • NPI 1518488618
  Medicare reassignment NPD
• Houston County Emergency Group, LLC

  • Emergency Medicine Physician
  • Warner Robins, GA
  • NPI 1013338193
  Medicare reassignment NPD
• Penobscot Valley Hospital

  • Critical Access Hospital
  • Lincoln, ME
  • NPI 1093716086
  Medicare reassignment NPD
• Southland Optim Jenkins Emergency Medical Services, LLC

  • Emergency Medicine Physician
  • Millen, GA
  • NPI 1265826242
  Medicare reassignment NPD
• Southland Optim Screven Emergency Medical Services LLC

  • Emergency Medicine Physician
  • Sylvania, GA
  • NPI 1174917157
  Medicare reassignment NPD
• Union County Hospital Authority

  • General Acute Care Hospital
  • Blairsville, GA
  • NPI 1487684122
  Medicare reassignment NPD
• Wayne Emergency Group LLC

  • Emergency Medicine Physician
  • Jesup, GA
  • NPI 1982828943
  Medicare reassignment NPD
• Southland Emergency Medical Services Consolidated, LLC

  • Hospitalist Physician
  • Cochran, GA
  • NPI 1033464391
  Medicare reassignment
• Houston County Emergency Group, LLC

  • Emergency Medicine Physician
  • Perry, GA
  • NPI 1467873547
  NPD

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

• HCA Health Services of New Hampshire Inc

  • General Acute Care Hospital
  • Derry, NH
  • NPI 1174570683
  Care Compare affiliation
• HCA Health Services of New Hampshire Inc

  • General Acute Care Hospital
  • Portsmouth, NH
  • NPI 1518913607
  Care Compare affiliation
• Hospital Authority of Liberty County

  • Critical Access Hospital
  • Hinesville, GA
  • NPI 1326079260
  Care Compare affiliation

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

{
    "created_epoch": "1134604800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785456000000",
    "number": "1659356384",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "63 MERGANSER COVE RD",
            "city": "ORRS ISLAND",
            "state": "ME",
            "postal_code": "040662408",
            "telephone_number": "603-432-1500"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1 PARKLAND DR",
            "city": "DERRY",
            "state": "NH",
            "postal_code": "030382746",
            "telephone_number": "207-794-3321"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "462 E G Miles Pkwy",
            "address_purpose": "LOCATION",
            "city": "Hinesville",
            "state": "GA",
            "postal_code": "313134000",
            "country_code": "US",
            "telephone_number": "912-369-9400",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "GRETTA",
        "first_name": "BRIAN",
        "middle_name": "L.",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2005-12-15",
        "last_updated": "2026-07-31",
        "certification_date": "2026-07-31",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "MA",
            "license": "205530",
            "primary": false
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "ME",
            "license": "MD13084",
            "primary": true
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "GA",
            "license": "62698",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Philip Wayne Grant, MD
• Greater Derry Community Health Services
• Greater Derry Oral Health Collaborative Corporation
• Andrea Michele Gregg, AS
• Lucinda Boyd Gregorio, LICSW
• Dawn Grist, NP
• Marc Michael Grossman, MD
• Derick Grover
• Mohamed A Guenena, MD
• Amina Gusic, PHARMD, RPH

• Emergency Medicine Physician in Derry, NH
• Providers in Derry, NH by specialty
• Emergency Medicine Physician in New Hampshire

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 31, 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.