Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Patrick Mannion Jr., D.D.S.

General Practice Dentistry in Ukiah, CA · enumerated 2006 · practices at William Vainer Inc..

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

National Provider Identifier

1972572162

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Registry record

Entity type Individual (Type 1)

Name Dr. William Patrick Mannion Jr.

Credential D.D.S.

Sex Male

Practice address 1091 S Dora St, Ukiah, CA, 95482

Phone (707) 462-1540

Fax (707) 462-7601

Enumeration date Mar 17, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 40850 (CA) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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 is the NPI number for William Mannion?

The National Provider Identifier (NPI) for William Mannion is 1972572162, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Mannion practice?

The practice location on file with NPPES is in Ukiah, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

L Powell General Practice Dentistry · Ukiah, CA NPI 1396720686 William Vainer Inc. General Practice Dentistry · Ukiah, CA NPI 1881314623

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.