NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William F. Cress, MD, Inc

Orthopaedic Surgery Physician in Clearlake, CA · enumerated 2008 · authorized official William Cress, Owner.

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

National Provider Identifier

1891958732

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name William F. Cress, MD, Inc
Practice address 3400 Emerson St, Ste B, Clearlake, CA, 95422
Phone (707) 994-1533
Fax (707) 994-4819
Enumeration date Jul 9, 2008
Last updated in NPPES Apr 17, 2009

Taxonomy & classification

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License G35296 (CA) Primary

Authorized official

Name William Cress
Title Owner
Phone (707) 994-1533

Other identifiers

Identifier Type State Issuer
1891958732 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

What is the NPI number for William F. Cress, MD, Inc?
The NPI for William F. Cress, MD, Inc is 1891958732, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for William F. Cress, MD, Inc?
NPPES lists William Cress (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 2009-04-17.