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

Leonard Rosoff Jr., MD

Individual provider Internal Medicine Physician · NPI 1730533001

Leonard Rosoff Jr., MD is an Internal Medicine Physician in Mercer Island, Washington. Practices as a sole proprietor. Licensed in Washington.

Licensed in
WA
In the registry since
2016
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

5407 W Mercer Way
Mercer Island, WA 98040-4635
Phone: (206) 232-3940
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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 14970 (WA)

Record details

NPI number1730533001
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedApril 22, 2016
Last updated in NPPESApril 22, 2016

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