Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Jack F Mason MD Professional Corp

Optometrist in Ukiah, CA · enumerated 2006 · authorized official Jack Mason, President.

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

National Provider Identifier

1609811314

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Registry record

Entity type Organization (Type 2)

Legal business name Jack F Mason MD Professional Corp

Practice address 555 S Dora St, Ukiah, CA, 95482

Phone (707) 462-0581

Fax (707) 463-0814

Enumeration date Jun 17, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers Primary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians Secondary

Authorized official

Name Jack Mason

Title President

Phone (707) 462-0581

Other identifiers

Identifier	Type	State	Issuer
GR0080990	Medicaid	CA	-

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

Where is Jack F Mason MD Professional Corp located?

The practice location on file with NPPES is in Ukiah, CA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2025-09-11. Verify at npiregistry.cms.hhs.gov.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.