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

Mrs. Marissa Louise Sitz, RN

Individual provider School Registered Nurse · NPI 1538974100

Mrs. Marissa Louise Sitz, RN is a School Registered Nurse in Ontario, California. Licensed in California. Registered with an NPI since 2025.

Licensed in
CA
In the registry since
2025
What do these letters mean?
RN — Registered Nurse
A licensed nurse who completed a nursing degree and passed the NCLEX-RN examination.

See every abbreviation used in this directory →

Practice location Address checks out

950 W D St
Ontario, CA 91762-3026
Phone: (909) 418-6428
Show map & directions

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

Specialties & licences

School Registered Nurse (primary) Taxonomy 163WS0200X · Licence 396664 (CA)

Record details

NPI number1538974100
Entity typeIndividual (Type 1)
GenderFemale
Credentials RN
Sole proprietorNo
NPI enumeratedFebruary 11, 2025
Last updated in NPPESFebruary 11, 2025
Certification dateFebruary 11, 2025

Other providers in Ontario