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

Dr. Dennis Arthur O'Brien, MD

Individual provider Psychiatry Physician · NPI 1043250079

Dr. Dennis Arthur O'Brien, MD is a Psychiatry Physician in Riverdale, Georgia. Practices as a sole proprietor. Licensed in California and Georgia.

Licensed in
CA, GA
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

223 Medical Center Dr
Riverdale, GA 30274-2640
Phone: (770) 991-8500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence C161834 (CA)
Psychiatry Physician Taxonomy 2084P0800X · Licence 025893 (GA)

Record details

NPI number1043250079
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 7, 2006
Last updated in NPPESJune 8, 2026
Certification dateJune 8, 2026

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