NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William S Cook Jr M D P A

Psychiatry Physician in Jackson, MS · enumerated 2008 · authorized official William Cook, Owner.

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

National Provider Identifier

1669625000

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name William S Cook Jr M D P A
Practice address 2906 N State St, Jackson, MS, 39216
Phone (601) 366-3660
Enumeration date Oct 29, 2008
Last updated in NPPES Oct 29, 2008

Taxonomy & classification

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 10170 (MS) Primary

Authorized official

Name William Cook
Title Owner
Phone (601) 366-3660

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 is the NPI number for William S Cook Jr M D P A?
The NPI for William S Cook Jr M D P A is 1669625000, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for William S Cook Jr M D P A?
NPPES lists William Cook (Owner) as the authorized official for this organization.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-10-29.