Dr Brian L Gretta, MD - Medicare Internal Medicine in Derry, NH

  1. Home
  2. Emergency Medicine
  3. NH
  4. Derry
Dr Brian L Gretta, MD is a medicare enrolled "Emergency Medicine" physician in Derry, New Hampshire. He graduated from medical school in 1986 and has 40 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Emergency Medicine Services Of Nh, Llc and his current practice location is 1 Parkland Dr, Derry, New Hampshire. You can reach out to his office (for appointments etc.) via phone at (207) 794-3321.

Dr Brian L Gretta is licensed to practice in Maine (license number MD13084) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1659356384.

Contact Information

Dr Brian L Gretta, MD
1 Parkland Dr,
Derry, NH 03038-2746
(207) 794-3321
Not Available

Map and Direction




Physician's Profile

Full NameDr Brian L Gretta
GenderMale
SpecialityInternal Medicine
Experience40 Years
Location1 Parkland Dr, Derry, New Hampshire
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Brian L Gretta graduated from medical school in 1986
  NPI Data:
  • NPI Number: 1659356384
  • Provider Enumeration Date: 12/15/2005
  • Last Update Date: 07/31/2026
  Medicare PECOS Information:
  • PECOS PAC ID: 1456384478
  • Enrollment ID: I20241009001697

Medical Identifiers

Medical identifiers for Dr Brian L Gretta such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1659356384NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine 62698 (Georgia)Secondary
207P00000XEmergency Medicine 205530 (Massachusetts)Secondary
207P00000XEmergency Medicine MD13084 (Maine)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Parkland Medical CenterDerry, NHHospital
Liberty Regional Medical CenterHinesville, GAHospital
Portsmouth Regional HospitalPortsmouth, NHHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Emergency Medicine Services Of Nh, Llc317398847466

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Brian L Gretta allows following entities to bill medicare on his behalf.
Entity NameEmergency Medicine Services of NH, LLC
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1386341444
PECOS PAC ID: 3173988474
Enrollment ID: O20230419002879

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Brian L Gretta is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Brian L Gretta, MD
63 Merganser Cove Rd,
Orrs Island, ME 04066-2408

Ph: (603) 432-1500		Dr Brian L Gretta, MD
1 Parkland Dr,
Derry, NH 03038-2746

Ph: (207) 794-3321

Reviews and Comments


Emergency Medicine Doctors in Derry, NH

Dr. Maria Michelle Diaz, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1 Parkland Dr, Derry, NH 03038
Phone: 603-421-2220    Fax: 603-421-2223
Thomas H Scott, DO
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1 Parkland Dr, Derry, NH 03038
Phone: 603-421-2220    Fax: 603-421-2223
Henry W Wagner, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1 Parkland Dr, Derry, NH 03038
Phone: 603-421-2220    Fax: 603-421-2223
Amy Jill Margolis, DO
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 1 Parkland Dr, Derry, NH 03038
Phone: 603-421-2220    Fax: 603-421-2223
Da H Le, MD
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 1 Parkland Dr, Derry, NH 03038
Phone: 603-421-2220    Fax: 603-421-2223
Dr. Marc Michael Grossman, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1 Parkland Dr, Parkland Medical Center, Derry, NH 03038
Phone: 305-415-1258    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.