NPPES file of Aug 9, 2026

Dennis Arthur O'Brien, M.D.

Psychiatry Physician · Riverdale, GA

Dennis Arthur O'Brien, M.D. is a psychiatry physician with a practice address in Riverdale, Georgia, and NPI 1043250079, issued on Jun 7, 2006. Check the license (Georgia 025893, as entered in NPPES) on the Georgia Composite Medical Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1043250079
Name
Dennis Arthur O'Brien
Credential
M.D.
Primary taxonomy
Psychiatry Physician 2084P0800X
License numbers
025893 GA
C161834 CA
Self-reported in NPPES; status is on the state search
Practice location
223 Medical Center Dr, Riverdale, GA 30274
Phone
(770) 991-8500
Enumerated
Jun 7, 2006
Record last updated
Jun 8, 2026
Medicaid ID
000483348A GA
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 223 Medical Center Dr

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Tyronjala Gainey-Grant, PMHNPPsychiatric/Mental Health Nurse Practitioner1659615342
  2. Lauren Mattox, PMHNPRegistered Nurse1043019508
  3. Eniola Oladokun-Meroyi, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1255067047
  4. Carrie Savage, LPCProfessional Counselor1043720774

Verify Dennis Arthur O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersGeorgia Composite Medical Board
    Search for license 025893    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Georgia license search

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26% fewer Medicare Part D claims than the average psychiatry physician in 2024

737 Medicare Part D claims for 134 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.

  1. Dennis O'Brien737
  2. Specialty average1,000

Most prescribed

  1. Trazodone Hcl40 claims
  2. Gabapentin35 claims
  3. Quetiapine Fumarate34 claims
  4. Aripiprazole31 claims
  5. Hydroxyzine Pamoate27 claims
  6. Amlodipine Besylate26 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $178.17

4 payments; by number, the most common kind was food and beverage; the largest payer was E.R. Squibb & Sons, L.L.C. The 13,693 providers of this specialty with any payment received $4,954.93 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Dennis O'Brien$178.17
  2. Specialty average$4,954.93

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Psychiatry Physician providers in Georgia

There are 1,291 psychiatry physician records in Georgia.

All 1,291 in Georgia → Every provider in Riverdale →

Other psychiatry physician records in Georgia

  1. Sujith Abbagoni, MDAugusta, GA1376334235
  2. Justin Abbott, MDAtlanta, GA1336080886
  3. Jennifer Abi Gerges, MDAugusta, GA1396581716
  4. Norman Abrams, MDAtlanta, GA1013073071
  5. Taryn Abrams, MDDunwoody, GA1689917965
  6. Sefiatu Abu, PMHNP-BCFayetteville, GA1982391629
  7. Roohi Abubaker, MDMarietta, GA1306013974
  8. Candace Adair, M.D.Atlanta, GA1972748937
  9. Adewumi Adebomojo, M.D.Decatur, GA1558591248
  10. Olasupo Adedapo-Jimoh, MDSmyrna, GA1487017349

Common questions

What is Dennis Arthur O'Brien, M.D.'s NPI number?

Dennis Arthur O'Brien, M.D.'s National Provider Identifier (NPI) is 1043250079, issued on Jun 7, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Dennis Arthur O'Brien, M.D. located?

The NPPES record lists a practice address at 223 Medical Center Dr, Riverdale, GA, 30274. Phone: (770) 991-8500. Providers update this record themselves, so call before visiting.

How can I verify Dennis Arthur O'Brien, M.D.'s license?

NPPES lists Georgia license number 025893, as entered by the provider. Search the Georgia Composite Medical Board at https://medicalboard.georgia.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Dennis Arthur O'Brien, M.D. prescribe under Medicare Part D?

In 2024, Dennis Arthur O'Brien, M.D. had 737 Medicare Part D claims for 134 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.