Mrs. Marissa Sitz RN
Also known as
- Professional nameSitz, Marissa Louise
Source: NPPES public registry.
About this NPIWhat this record shows.
NPI 1538974100 is registered to Mrs. Marissa Sitz RN, a School Registered Nurse practising at 950 W D St in Ontario, California. School Registered Nurse is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy. Mrs. Marissa Sitz RN has been enumerated in the National Provider Identifier (NPI) registry since 2025.
Your brand here.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Mrs. Marissa Sitz RN accepts. To confirm in-network status with your specific health plan, contact Mrs. Marissa Sitz RN directly at (909) 418-6428.
Frequently asked
Yes. NPI 1538974100 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
School Registered Nurse is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (909) 418-6428.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Mrs. Marissa Sitz RN is a Type-1 individual NPI.