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

Individual provider Internal Medicine Physician · NPI 1053417485

Dr. Karl Hsu, MD is an Internal Medicine Physician in Lexington, Massachusetts. Licensed in Pennsylvania. Registered with an NPI since 2006.

Licensed in
PA
In the registry since
2006
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

9 Locke Ln
Lexington, MA 02420-2706
Phone: (617) 680-4488
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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 MD425621 (PA)
Geriatric Medicine (Internal Medicine) Physician Taxonomy 207RG0300X · Licence MD425621 (PA)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence MD425621 (PA)

Record details

NPI number1053417485
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 15, 2006
Last updated in NPPESAugust 15, 2012

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