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

Dr. Zachary Weeder Simpson, MD

Individual provider Geriatric Medicine (Internal Medicine) Physician · NPI 1073514121

Dr. Zachary Weeder Simpson, MD is a Geriatric Medicine (Internal Medicine) Physician in Williamsport, Pennsylvania. Licensed in Pennsylvania. Registered with an NPI since 2005.

Licensed in
PA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1100 Grampian Blvd
Williamsport, PA 17701-1909
Phone: (570) 320-7691
Fax: (570) 320-7898
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Geriatric Medicine (Internal Medicine) Physician (primary) Taxonomy 207RG0300X · Licence MD065196L (PA)

Record details

NPI number1073514121
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 10, 2005
Last updated in NPPESNovember 9, 2015

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