Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

DENNIS A O'BRIEN, MD PC
NPI 1053219386
Psychiatry & Neurology - Psychiatry in Riverdale, GA

Q: What is Dennis A O'brien, MD PC's NPI number?

The NPI number for Dennis A O'brien, MD PC is 1053219386. It was assigned to this organization in the NPPES registry on October 27, 2026.

Q: What is Dennis A O'brien, MD PC's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Active since October 27, 2026

223 MEDICAL CENTER DR, RIVERDALE, GA 30274(770) 434-4567 Get Directions Write a Review

NPPES record added: October 27, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Dennis A O'brien, Md Pc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DENNIS A O'BRIEN, MD PC (NPI 1053219386) is a healthcare organization registered as a psychiatry in Riverdale, Georgia and active in the NPI registry since October 2026. The organization lists Dennis O'brien, Owner, as its authorized official.

NPPES Registry Identity

NPI1053219386

Entity TypeOrganization

Primary Taxonomy2084P0800X

Legal Business NameDENNIS A O'BRIEN, MD PC

Location Address223 MEDICAL CENTER DRRiverdale, GA 30274-2640

Mailing Address2563 Dayview LnAtlanta, GA 30331-9532

Phone(770) 434-4567

Organization SubpartNo

Authorized OfficialDennis O'brienOwner · (770) 329-1478

Enumeration DateOctober 27, 2026

NPPES CertifiedOctober 27, 2026

✔ NPI 1053219386 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians

Taxonomy Code2084P0800X

Definition

A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

223 MEDICAL CENTER DR, Riverdale, GA 30274

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Other Providers at the Same Location NPPES 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. LAUREN ASHLEY MATTOX PMHNP

Registered Nurse