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

Dr. Mark J. Marshall, DO

Individual provider Internal Medicine Physician · NPI 1326197963

Dr. Mark J. Marshall, DO practises Internal Medicine in Sharon, Connecticut. Qualified in 2009, 17 years ago. Practices with Nuvance Health Medical Practice PC, a 575-clinician group and accepts Medicare assignment. Licensed in Connecticut and New York.

Years since qualifying
17
Licensed in
CT, NY
In the registry since
2007
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

50 Hospital Hill Rd Sharon Hospital
Sharon, CT 06069-2096 Not confirmed with CMS for 19 years — call before visiting
Phone: (860) 364-4201
Fax: (860) 364-4211
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 000529 (CT)
Internal Medicine Physician Taxonomy 207R00000X · Licence 203678 (NY)

Record details

NPI number1326197963
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJanuary 10, 2007
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2009 (17 years in practice)
Group practice Nuvance Health Medical Practice Pc — 575 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 patients130
Services billed 232 a service is one billed item, such as a visit, a test or a procedure
Average patient age79

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.

Colleagues at Nuvance Health Medical Practice PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 575 clinicians in the practice; 12 are shown here.

Other providers in Sharon