Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Mr. Gregory M McCarthy, MD

Individual provider Geriatric Medicine (Internal Medicine) Physician · NPI 1942393525

Mr. Gregory M McCarthy, MD practises Gastroenterology in Manchester, New Hampshire. Qualified in 1980, 46 years ago. Practices with Elliot Professional Services, a 424-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Colorado and New Hampshire.

Years since qualifying
46
Licensed in
CO, NH
In the registry since
2006
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

100 Hitchcock Way
Manchester, NH 03104-4125
Phone: (603) 695-2500
Fax: (603) 369-6365
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 2030 Mountain View Ave, Longmont, CO 80501-3178 — (720) 652-8650

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 7256 (NH)
Geriatric Medicine (Internal Medicine) Physician Taxonomy 207RG0300X · Licence CDR.0000643 (CO)
Gastroenterology Physician Taxonomy 207RG0100X · Licence CDR.0000643 (CO)

Record details

NPI number1942393525
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 2, 2006
Last updated in NPPESAugust 19, 2022
Certification dateAugust 17, 2022

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolOTHER
Graduated 1980 (46 years in practice)
Group practice Elliot Professional Services — 424 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 127 times · 85th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 115 times · 80th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients309
Services billed 394 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Also affiliated with 1 inpatient rehabilitation facility, which CMS identifies by certification number only.

Colleagues at Elliot Professional Services

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 424 clinicians in the practice; 12 are shown here.

Other providers in Manchester