Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Brian L. Gretta, MD

Individual provider Emergency Medicine Physician · NPI 1659356384

Dr. Brian L. Gretta, MD practises Internal Medicine in Derry, New Hampshire. Qualified in 1986, 40 years ago. Practices with Emergency Medicine Services of Nh, LLC, a 64-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Georgia, Massachusetts and Maine.

Years since qualifying
40
Licensed in
GA, MA, ME
In the registry since
2005
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1 Parkland Dr
Derry, NH 03038-2746
Phone: (207) 794-3321
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 462 E G Miles Pkwy, Hinesville, GA 31313-4000 — (912) 369-9400

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence MD13084 (ME)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 205530 (MA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 62698 (GA)

Record details

NPI number1659356384
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedDecember 15, 2005
Last updated in NPPESJuly 31, 2026
Certification dateJuly 31, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 1986 (40 years in practice)
Group practice Emergency Medicine Services Of Nh, Llc — 64 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients103
Services billed 127 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Liberty Regional Medical Center Hospital · Hinesville, GA
  • Parkland Medical Center Hospital · Derry, NH
  • Portsmouth Regional Hospital Hospital · Portsmouth, NH

Colleagues at Emergency Medicine Services of Nh, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 64 clinicians in the practice; 12 are shown here.

Other providers in Derry