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

MS. Katherine L Sieu, RN, NP

Individual provider Adult Health Nurse Practitioner · NPI 1356591085

MS. Katherine L Sieu, RN, NP is an Adult Health Nurse Practitioner in Walnut Creek, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2008
What do these letters mean?
RN — Registered Nurse
A licensed nurse who completed a nursing degree and passed the NCLEX-RN examination.
NP — Nurse Practitioner
An advanced practice nurse who can diagnose, treat and in most states prescribe.

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Practice location Address checks out

500 Lennon Ln
Walnut Creek, CA 94598-2415
Phone: (925) 939-9610
Fax: (925) 939-9630
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Adult Health Nurse Practitioner (primary) Taxonomy 363LA2200X · Licence 18369 (CA)

Record details

NPI number1356591085
Entity typeIndividual (Type 1)
GenderFemale
Credentials RN , NP
Sole proprietorYes
NPI enumeratedSeptember 30, 2008
Last updated in NPPESAugust 27, 2010

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