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

Nathaniel J Merrell, MD

Individual provider Surgery Physician · NPI 1922162262

Nathaniel J Merrell, MD practises General Surgery in Leominster, Massachusetts. Graduated from University of Rochester School of Medicine and Dentistry in 1987, 39 years ago. Practices with R Leslie Shelton MD PC, a 2-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
39
Trained at
University of Rochester School of Medicine and Dentistry
Licensed in
MA
In the registry since
2006
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 Hospital Rd Ste 2B
Leominster, MA 01453-2253 Not confirmed with CMS for 19 years — call before visiting
Phone: (978) 840-6481
Fax: (978) 840-0506
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 72557 (MA)

Record details

NPI number1922162262
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 21, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyGENERAL SURGERY
Medical schoolUNIVERSITY OF ROCHESTER SCHOOL OF MEDICINE AND DENTISTRY
Graduated 1987 (39 years in practice)
Group practice R Leslie Shelton Md Pc — 2 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.

Hernia repair - groin (open) 12 times · 91st percentile
Mastectomy 16 times · 73rd percentile
Melanoma (skin cancer) excision 16 times · 71st percentile
Colonoscopy 1–10 times
Removal of nail tissue 1–10 times
Removal of tissue 1–10 times
Skin biopsy 1–10 times
Upper gastrointestinal (GI) endoscopy for acid reflux 1–10 times

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 patients226
Services billed 451 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.

Colleagues at R Leslie Shelton MD PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Leominster