William O Baker

William O Baker is a Case Manager/Care Coordinator provider (Case Manager/Care Coordinator) practicing in Vallejo, CA, registered in the NPPES registry with NPI 1952259632 since 2026.

✓ Active NPI ✓ Valid NPI checksum

NPI	1952259632
Entity type	Individual (Type 1)
Name	William O Baker
Sex	Male
Practice address	PO BOX 5431, Vallejo, CA, 94591
Phone	5106844880
Enumeration date	2026-03-19
Last updated in NPPES	2026-03-19

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
171M00000X	Case Manager/Care Coordinator	Primary	—	—

Copy-ready billing details

Provider: William Baker
NPI: 1952259632
Taxonomy: 171M00000X (Case Manager/Care Coordinator)
Address: PO BOX 5431, Vallejo, CA, 94591

Verify this record

Cross-check NPI 1952259632 against the authoritative CMS record: view William O Baker on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

What specialty is William Baker?

William Baker is registered in NPPES with the primary taxonomy of Case Manager/Care Coordinator. 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.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2026-03-19.