Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Patrick O'Callahan, MD

Individual provider Preventive Medicine/Occupational Environmental Medicine Physician · NPI 1386733988

Dr. Patrick O'Callahan, MD is a Preventive Medicine/Occupational Environmental Medicine Physician in Stonington, Connecticut. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

107 Wilcox Rd Ste 105
Stonington, CT 06378-2614
Phone: (650) 380-4395
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Preventive Medicine/Occupational Environmental Medicine Physician (primary) Taxonomy 2083P0500X · Licence C53489 (CA)
Family Medicine Physician Taxonomy 207Q00000X · Licence C53489 (CA)

Record details

NPI number1386733988
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 12, 2006
Last updated in NPPESSeptember 9, 2013
Mailing address300 S Harbor Blvd, Suite 600, Anaheim, CA 92805-3733