Ronald O'Halloran, M.D.
NPI 1841357647 · Anatomic Pathology Physician · Ventura, CA
Ronald O'Halloran, M.D. is a Anatomic Pathology Physician provider in Ventura, CA (NPI 1841357647).
Provider details
- NPI number
- 1841357647
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G38167 (CA)
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
19 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
- 2007-01-02
- Last updated
- 2007-07-08
Frequently asked questions
- What is Ronald O'Halloran's NPI number?
- Ronald O'Halloran's National Provider Identifier (NPI) is 1841357647, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ronald O'Halloran's specialty?
- Ronald O'Halloran is listed in the NPPES registry with a primary specialty of Anatomic Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Ronald O'Halloran located?
- Ronald O'Halloran's practice location on file with NPPES is 3291 Loma Vista Rd, Ventura, CA 93003-3099.
- What is Ronald O'Halloran's phone number?
- The practice phone number listed in the NPPES registry for Ronald O'Halloran is (805) 652-6556.
- Is Ronald O'Halloran's NPI active?
- Yes — Ronald O'Halloran's NPI (1841357647) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.