NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William W Winternitz Jr MD Inc

Specialist in Poway, CA · enumerated 2007 · authorized official William Winternitz, Owner.

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

National Provider Identifier

1588843486

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name William W Winternitz Jr MD Inc
Practice address 12630 Monte Vista Rd, Ste 105, Poway, CA, 92064
Phone (858) 487-6440
Fax (858) 487-7281
Enumeration date Oct 26, 2007
Last updated in NPPES Aug 20, 2020

Taxonomy & classification

174400000X Specialist Other Service Providers · License G51348 (CA) Primary

Authorized official

Name William Winternitz
Title Owner
Phone (858) 487-6440

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 W Winternitz Jr MD Inc?
The NPI for William W Winternitz Jr MD Inc is 1588843486, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for William W Winternitz Jr MD Inc?
NPPES lists William Winternitz (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 2020-08-20.