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

Katelyn Pennisi Williar, PA

Individual provider Medical Physician Assistant · NPI 1891029260

Katelyn Pennisi Williar, PA is a Medical Physician Assistant in Washington, District of Columbia. Licensed in Virginia. Registered with an NPI since 2009.

Licensed in
VA
In the registry since
2009
What do these letters mean?
PA — Physician Assistant
A licensed clinician who examines, diagnoses and treats under a physician's supervision.

See every abbreviation used in this directory →

Practice location Address checks out

5255 Loughboro Rd NW Sibley Memorial Hospital
Washington, DC 20016
Phone: (240) 537-4088
Fax: (240) 537-4588
Show map & directions

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

Specialties & licences

Medical Physician Assistant (primary) Taxonomy 363AM0700X · Licence 0110003165 (VA)

Record details

NPI number1891029260
Entity typeIndividual (Type 1)
GenderFemale
Credentials PA
Sole proprietorNo
NPI enumeratedOctober 1, 2009
Last updated in NPPESMarch 24, 2020
Certification dateMarch 24, 2020

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