Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Erwin B. Clahassey M.D., A Professional Corporation

Anatomic Pathology & Clinical Pathology Physician in Ventura, CA · enumerated 2005 · authorized official Erwin Clahassey, President.

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

National Provider Identifier

1265426969

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Erwin B. Clahassey M.D., A Professional Corporation

Practice address 147 N Brent St, Ventura, CA, 93003

Phone (805) 652-5023

Fax (805) 643-8511

Enumeration date Sep 8, 2005

Last updated in NPPES Aug 2, 2013

Taxonomy & classification

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Erwin Clahassey

Title President

Phone (805) 652-5023

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

Who is the authorized official for Erwin B. Clahassey M.D., A Professional Corporation?

NPPES lists Erwin Clahassey (President) as the authorized official for this organization.

What is the NPI number for Erwin B. Clahassey M.D., A Professional Corporation?

The NPI for Erwin B. Clahassey M.D., A Professional Corporation is 1265426969, a Type 2 (organization) record in the CMS NPPES registry.

Providers at this address

Browse all →

Meeae Kwon Anatomic Pathology & Clinical Pathology Physician · Ventura, CA NPI 1669467114 Dang Bui Anatomic Pathology & Clinical Pathology Physician · Ventura, CA NPI 1649265182 Christina Matts Hospice and Palliative Medicine (Emergency Medicine) Physician · Ventura, CA NPI 1063403590 Community Memorial Health System General Acute Care Hospital · Ventura, CA NPI 1215903018 Carmen Martinez Vascular & Interventional Radiology Physician · Ventura, CA NPI 1679533822 Eric Fields Emergency Medicine Physician · Ventura, CA NPI 1972557502 Bengt-Ola Bengtsson Neonatal-Perinatal Medicine Physician · Ventura, CA NPI 1689627580 John Vanhouten Specialist · Ventura, CA NPI 1811943046

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-08-02.