Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mrs. Christa Danielle Krellwitz, NP-C

Primary Care Clinic/Center in Upland, CA · enumerated 2016.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1821442393

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Registry record

Entity type Individual (Type 1)

Name Mrs. Christa Danielle Krellwitz

Credential NP-C

Sex Female

Practice address Upland, CA, 91786

Phone (909) 985-1908

Enumeration date Apr 20, 2016

Last updated in NPPES Mar 7, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

261QP2300X Primary Care Clinic/Center Ambulatory Health Care Facilities · License NP95004007 (CA) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Christa Krellwitz practice?

The practice location on file with NPPES is in Upland, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Christa Krellwitz?

The National Provider Identifier (NPI) for Christa Krellwitz is 1821442393, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Joanne Lister Family Nurse Practitioner · Upland, CA NPI 1467407767 Jody Bouma Nurse Practitioner · Upland, CA NPI 1841425279

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.