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

Mrs. Mary Ann Guillermo Barker, LVN

Individual provider Licensed Vocational Nurse · NPI 1831812346

Mrs. Mary Ann Guillermo Barker, LVN is a Licensed Vocational Nurse in Grass Valley, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2022
What do these letters mean?
LVN — Licensed Vocational Nurse
The same role as an LPN; the title used in California and Texas.

See every abbreviation used in this directory →

Practice location Address checks out

500 Crown Point Cir
Grass Valley, CA 95945-9561
Phone: (530) 265-1437
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Licensed Vocational Nurse (primary) Taxonomy 164X00000X · Licence VN147889 (CA)

Record details

NPI number1831812346
Entity typeIndividual (Type 1)
GenderFemale
Credentials LVN
Sole proprietorYes
NPI enumeratedSeptember 20, 2022
Last updated in NPPESSeptember 20, 2022
Certification dateSeptember 20, 2022

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