Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mary M. Flynn, MD

Individual provider Gastroenterology Physician · NPI 1992094221

Mary M. Flynn, MD practises Gastroenterology in Worcester, Massachusetts. Graduated from Boston University School of Medicine in 2011, 15 years ago. Practices with Umass Memorial Medical Group Inc, a 2,467-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Georgia, Massachusetts and Virginia.

Years since qualifying
15
Trained at
Boston University School of Medicine
Licensed in
GA, MA, VA
In the registry since
2011
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

55 Lake Ave N
Worcester, MA 01655-0002
Phone: (508) 334-2846
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 157 Union St, Marlborough, MA 01752-1228 — (508) 334-3068
  • 21 Eastern Ave, Worcester, MA 01605-3094 — (508) 856-2500
  • 119 Belmont St, Worcester, MA 01605-2903 — (508) 334-2846

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 292385 (MA)
Gastroenterology Physician Taxonomy 207RG0100X · Licence 080306 (GA)
Hospitalist Physician Taxonomy 208M00000X · Licence 0101256088 (VA)

Record details

NPI number1992094221
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 7, 2011
Last updated in NPPESJuly 7, 2022
Certification dateJuly 7, 2022

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolBOSTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 2011 (15 years in practice)
Group practice Umass Memorial Medical Group Inc — 2467 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 86 times · 76th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 50 times · 63rd 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 patients223
Services billed 381 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.

Colleagues at Umass Memorial Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2467 clinicians in the practice; 12 are shown here.

Other providers in Worcester