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DR. DENNIS ARTHUR O'BRIEN M.D.
NPI 1043250079
Psychiatry & Neurology - Psychiatry in Riverdale, GA

Active since June 07, 2006PECOS Enrolled
223 MEDICAL CENTER DR, RIVERDALE, GA 30274(770) 991-8500 Get Directions Write a Review

NPPES record last updated: June 8, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Dennis Arthur O'brien M.d. NPPES

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

DR. DENNIS ARTHUR O'BRIEN M.D. (NPI 1043250079) is an individual psychiatry provider in Riverdale, Georgia, licensed in California (C161834) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1043250079
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameDR. DENNIS ARTHUR O'BRIENCredential: M.D.
Location Address223 MEDICAL CENTER DRRiverdale, GA 30274-2640
Mailing Address5325 Broder BlvdDublin, CA 94568-3309
Phone(770) 991-8500
Sole ProprietorYes
Enumeration DateJune 7, 2006
Last NPPES UpdateJune 8, 2026
NPPES CertifiedJune 8, 2026
✔ NPI 1043250079 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
Licenses✔ Licensed in CA · C161834✔ Licensed in GA · 025893
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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Other Identifiers 1

Medicaid000483348AGA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Dennis Arthur O'brien M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

5

Medicare enrollment records show Dennis O'brien reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Uhs Of Anchor L.P.
3.9 mi
Psychiatric Hospital
5454 YORKTOWN DRIVE
Atlanta, GA 30349
  • Reassigned Medicare billing, Georgia enrollment
  • 30 clinicians in this Medicare group
NPI 1023095429 (770) 991-6044
Department Of Behavioral Health And Developmental Disabilities
10 mi
Psychiatric Hospital
3073 PANTHERSVILLE RD
Decatur, GA 30034
  • Reassigned Medicare billing, Georgia enrollment
  • 168 clinicians in this Medicare group
NPI 1124254941 (404) 212-5454
Shailesh Patel MD LLC
15 mi
Psychiatry
300 PRIME PT STE 201
Peachtree City, GA 30269
  • Reassigned Medicare billing, Georgia enrollment
  • 6 clinicians in this Medicare group
NPI 1669765467 (770) 474-8888
Breakthrough Recovery Outreach, LLC
22 mi
Substance Abuse Rehabilitation Facility
3648 CHAMBLEE TUCKER RD, SUITE F
Atlanta, GA 30341
  • Reassigned Medicare billing, Georgia enrollment
  • 5 clinicians in this Medicare group
NPI 1982909503 (770) 493-7750
County Of Alameda
2,109 mi
Community/Behavioral Health
1453 FIRST ST
Livermore, CA 94550
  • Reassigned Medicare billing, California enrollment
  • 50 clinicians in this Medicare group
NPI 1639458854 (510) 567-8100

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
82 services17 patients
Psychiatric diagnostic evaluation with medical services 90792
A psychiatric diagnostic evaluation with medical services is a comprehensive assessment. It includes a detailed examination of your mental health and physical wellbeing, as well as your personal and family history. This evaluation aids in creating an effective treatment plan.
19 services15 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 30274 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$172.43 typical visit price
range $56.84 – $172.43
Typical copayment $43.10 (range $14.21 – $43.10)
Most-billed visit code 99205
Established Patient
$70.85 typical visit price
range $18.22 – $140.40
Typical copayment $17.71 (range $4.55 – $35.10)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 5

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

MRS. LAUREN ASHLEY MATTOX PMHNP
Registered Nurse
223 MEDICAL CENTER DR
RIVERDALE, GA 30274
Clayton County (770) 991-8500
CARRIE B SAVAGE LPC
Counselor (Professional)
223 MEDICAL CENTER DR
RIVERDALE, GA 30274
Clayton County (770) 766-7006
ENIOLA OLADOKUN-MEROYI PMHNP-BC
Nurse Practitioner (Psychiatric/Mental Health)
223 MEDICAL CENTER DR
RIVERDALE, GA 30274
Clayton County (770) 873-0000
TYRONJALA SHONTEL GAINEY-GRANT PMHNP
Nurse Practitioner (Psychiatric/Mental Health)
223 MEDICAL CENTER DR
RIVERDALE, GA 30274
Clayton County (770) 991-8500
MISS ERIN NICOLE HOWSE
Psychiatric Hospital
223 MEDICAL CENTER DR
RIVERDALE, GA 30274
Clayton County (770) 991-8500

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Dennis O'brien's NPI number?

The NPI number for Dennis O'brien is 1043250079. It was assigned to this individual provider in the NPPES registry on June 7, 2006.

Where is Dennis O'brien located?

Dennis O'brien practices at 223 Medical Center Dr, Riverdale, GA 30274. The listed phone number is (770) 991-8500.

What is Dennis O'brien's specialty?

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

Is Dennis O'brien enrolled in Medicare?

Yes. Dennis O'brien is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Dennis O'brien's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Dennis O'brien reassigns Medicare benefits to 5 organizations: Uhs Of Anchor L.P. (Atlanta, GA), Department Of Behavioral Health And Developmental Disabilities (Decatur, GA), Shailesh Patel MD LLC (Peachtree City, GA), Breakthrough Recovery Outreach, LLC (Atlanta, GA) and County Of Alameda (Livermore, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Dennis O'brien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Dennis O'brien accept?

Health plans from Oscar Health list Dennis O'brien as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Dennis O'brien was last updated on June 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.