Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Margaret Litwin Sommerville, MD

Individual provider Dermatology Physician · NPI 1861671505

Dr. Margaret Litwin Sommerville, MD practises Dermatology in Chevy Chase, Maryland. Graduated from George Washington University School of Medicine in 1991, 35 years ago. Accepts Medicare assignment. Licensed in Maryland.

Years since qualifying
35
Trained at
George Washington University School of Medicine
Licensed in
MD
In the registry since
2007
Specialties on file
2
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

5530 Wisconsin Ave Ste 830
Chevy Chase, MD 20815-4461 Not confirmed with CMS for 18 years — call before visiting
Phone: (301) 656-7546
Fax: (301) 469-4952
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Dermatology Physician (primary) Taxonomy 207N00000X · Licence D0061245 (MD)
Procedural Dermatology Physician Taxonomy 207NS0135X · Licence D0061245 (MD)

Record details

NPI number1861671505
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 30, 2007
Last updated in NPPESAugust 10, 2008

Medicare enrollment

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

Medicare specialtyDERMATOLOGY
Medical schoolGEORGE WASHINGTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 1991 (35 years in practice)
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.

Removal of skin lesions 280 times · 82nd percentile
Skin biopsy 45 times · 68th percentile
Removal or shaving of skin growth 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 patients97
Services billed 580 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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.

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