Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Marsha Lou Chellsen, PHN, NP

Registered Nurse in Stockton, CA · enumerated 2009.

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

National Provider Identifier

1437382272

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Registry record

Entity type Individual (Type 1)

Name Mrs. Marsha Lou Chellsen

Credential PHN, NP

Sex Female

Practice address 1601 E Hazelton Ave, Stockton, CA, 95205

Phone (209) 468-3868

Fax (209) 468-2072

Enumeration date Aug 27, 2009

Last updated in NPPES Aug 27, 2009

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 384433 (CA) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP credential

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

What specialty is Marsha Chellsen?

Marsha Chellsen is registered in NPPES with the primary taxonomy of Registered Nurse. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-08-27.