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

Mary Katherine Guay, PA-C

Individual provider Physician Assistant · NPI 1790769008

Mary Katherine Guay, PA-C is a Physician Assistant in Baltimore, Maryland. Works from 2 locations. Licensed in California, Indiana, Maryland and Pennsylvania.

Licensed in
CA, IN, MD, PA
In the registry since
2005
Specialties on file
4
What do these letters mean?
PA-C — Physician Assistant, Certified
A physician assistant who holds current national certification.

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Practice location Address checks out

1800 Orleans St
Baltimore, MD 21287-0010
Phone: (410) 502-2037
Fax: (410) 955-0737
Show map & directions

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

Additional practice locations (1)

  • 200 W Arbor Dr, San Diego, CA 92103-9000 — (800) 926-8273

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X · Licence C05161 (MD)
Physician Assistant Taxonomy 363A00000X · Licence 10001429A (IN)
Physician Assistant Taxonomy 363A00000X · Licence MA053807 (PA)
Physician Assistant Taxonomy 363A00000X · Licence 56513 (CA)

Record details

NPI number1790769008
Entity typeIndividual (Type 1)
GenderFemale
Credentials PA-C
Sole proprietorNo
NPI enumeratedNovember 30, 2005
Last updated in NPPESJanuary 24, 2024
Certification dateJanuary 24, 2024

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