What is Marissa Sitz's NPI number?

Marissa Sitz's National Provider Identifier (NPI) is 1538974100, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Marissa Sitz's specialty?

Marissa Sitz is listed in the NPPES registry with a primary specialty of School Registered Nurse (Nursing Service Providers).

Where is Marissa Sitz located?

Marissa Sitz's practice location on file with NPPES is 950 W D St, Ontario, CA 91762-3026.

What is Marissa Sitz's phone number?

The practice phone number listed in the NPPES registry for Marissa Sitz is (909) 418-6428.

Is Marissa Sitz's NPI active?

Yes — Marissa Sitz's NPI (1538974100) is active in the NPPES registry as of the last update on 2025-02-11.

IndividualActive

Marissa Sitz, RN

NPI 1538974100 · School Registered Nurse · Ontario, CA

Marissa Sitz, RN is a School Registered Nurse provider in Ontario, CA (NPI 1538974100).

Provider details

NPI number: 1538974100
Entity type: Individual
Primary specialty: School Registered NurseNursing Service Providers
Credential: RN
Sex: Female
Sole proprietor: No
License: 396664 (CA)

Specialties & taxonomies

School Registered NursePrimary163WS0200XLicense 396664 (CA)
Nursing Service Providers

Profile Score

Established profile(55/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
1 yr in NPPES registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

950 W D St

Ontario, CA 91762-3026

Phone: (909) 418-6428

Street-level locationGet directions

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Mailing address