Patrick O'Callahan, M.D.
NPI 1386733988 · Preventive Medicine/Occupational Environmental Medicine Physician · Stonington, CT
Patrick O'Callahan, M.D. is a Preventive Medicine/Occupational Environmental Medicine Physician provider in Stonington, CT (NPI 1386733988).
Provider details
- NPI number
- 1386733988
- Entity type
- Individual
- Primary specialty
- Preventive Medicine/Occupational Environmental Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- C53489 (CA)
Specialties & taxonomies
- Preventive Medicine/Occupational Environmental Medicine PhysicianPrimary2083P0500XLicense C53489 (CA)
Allopathic & Osteopathic Physicians
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
- 2006-10-12
- Last updated
- 2013-09-09
Frequently asked questions
- What is Patrick O'Callahan's NPI number?
- Patrick O'Callahan's National Provider Identifier (NPI) is 1386733988, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Patrick O'Callahan's specialty?
- Patrick O'Callahan is listed in the NPPES registry with a primary specialty of Preventive Medicine/Occupational Environmental Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Patrick O'Callahan located?
- Patrick O'Callahan's practice location on file with NPPES is 107 Wilcox Rd, Stonington, CT 06378-2614.
- What is Patrick O'Callahan's phone number?
- The practice phone number listed in the NPPES registry for Patrick O'Callahan is (650) 380-4395.
- Is Patrick O'Callahan's NPI active?
- Yes — Patrick O'Callahan's NPI (1386733988) is active in the NPPES registry as of the last update on 2013-09-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.