Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Deirdre Joan Day, M.S.W.

Social Worker in Auburn, CA · enumerated 2012.

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

National Provider Identifier

1285983403

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Registry record

Entity type Individual (Type 1)

Name Ms. Deirdre Joan Day

Credential M.S.W.

Sex Female

Practice address 11716 Enterprise Dr, Auburn, CA, 95603

Phone (530) 886-2870

Enumeration date Sep 4, 2012

Last updated in NPPES Sep 4, 2012

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers · License 104100000X (ZZ) Primary

Other identifiers

Identifier	Type	State	Issuer
51231723	Other	CA	EMPLOYEE NUMBER 51231723
101YM0800X	Other	CA	TAXONOMY CODE

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

Is NPI 1285983403 active?

Yes, as of the latest NPPES snapshot, NPI 1285983403 is active (record last updated 2012-09-04).

How do I verify Deirdre Day's NPI record?

Cross-check NPI 1285983403 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-09-04.