Erwin B. Clahassey M.D., a Professional Corporation
NPI 1265426969 · Anatomic Pathology & Clinical Pathology Physician · Ventura, CA
Erwin B. Clahassey M.D., a Professional Corporation is a Anatomic Pathology & Clinical Pathology Physician organization in Ventura, CA (NPI 1265426969).
Provider details
- NPI number
- 1265426969
- Entity type
- Organization
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Erwin Clahassey, President(805) 652-5023
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-08
- Last updated
- 2013-08-02
Frequently asked questions
- What is Erwin B. Clahassey M.D., a Professional Corporation's NPI number?
- Erwin B. Clahassey M.D., a Professional Corporation's National Provider Identifier (NPI) is 1265426969, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Erwin B. Clahassey M.D., a Professional Corporation?
- Erwin B. Clahassey M.D., a Professional Corporation is classified in the NPPES registry as Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Erwin B. Clahassey M.D., a Professional Corporation located?
- Erwin B. Clahassey M.D., a Professional Corporation's practice location on file with NPPES is 147 N Brent St, Ventura, CA 93003-2809.
- What is Erwin B. Clahassey M.D., a Professional Corporation's phone number?
- The practice phone number listed in the NPPES registry for Erwin B. Clahassey M.D., a Professional Corporation is (805) 652-5023.
- Who is the authorized official for Erwin B. Clahassey M.D., a Professional Corporation?
- The authorized official listed on Erwin B. Clahassey M.D., a Professional Corporation's NPPES record is Erwin Clahassey, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Erwin B. Clahassey M.D., a Professional Corporation's NPI active?
- Yes — Erwin B. Clahassey M.D., a Professional Corporation's NPI (1265426969) is active in the NPPES registry as of the last update on 2013-08-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.