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

Mary Ann Williamson, NP

Individual provider Nurse Practitioner · NPI 1699042457

Mary Ann Williamson, NP is a Nurse Practitioner in Concord, California. Licensed in California. Registered with an NPI since 2011.

Licensed in
CA
In the registry since
2011
What do these letters mean?
NP — Nurse Practitioner
An advanced practice nurse who can diagnose, treat and in most states prescribe.

See every abbreviation used in this directory →

Practice location Address checks out

2185 Pacheco St
Concord, CA 94520-2309
Phone: (925) 676-0505
Fax: (925) 676-2814
Show map & directions

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

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence 2400 (CA)

Record details

NPI number1699042457
Entity typeIndividual (Type 1)
GenderFemale
Credentials NP
Sole proprietorNo
NPI enumeratedNovember 22, 2011
Last updated in NPPESJuly 30, 2015

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