Dennis O'Brien, M.D.
NPI 1043250079 · Psychiatry Physician · Dublin, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dennis O'Brien, M.D. is a Psychiatry Physician provider in Dublin, CA (NPI 1043250079).
Provider details
- NPI number
- 1043250079
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 025893 (GA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
101 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 82 | $64 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 19 | $166 |
Typical Medicare-allowed amounts for these services range $64–$166 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Trazodone Hcl | 40 | 34 |
| Gabapentin | 35 | 25 |
| Quetiapine Fumarate | 34 | 26 |
| Aripiprazole | 31 | 27 |
| Hydroxyzine Pamoate | 27 | 18 |
| Amlodipine Besylate | 26 | 19 |
| Divalproex Sodium | 26 | 22 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$178 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 910 N Hairston RdStone Mountain, GA 30083-2802Phone: (404) 377-5556Fax: (404) 292-9903
Registry dates
- Enumerated
- 2006-06-07
- Last updated
- 2019-11-15
Frequently asked questions
- What is Dennis O'Brien's NPI number?
- Dennis O'Brien's National Provider Identifier (NPI) is 1043250079, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dennis O'Brien's specialty?
- Dennis O'Brien is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Dennis O'Brien located?
- Dennis O'Brien's practice location on file with NPPES is 5325 Broder Blvd, Dublin, CA 94568.
- What is Dennis O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Dennis O'Brien is (925) 551-6500.
- Does Dennis O'Brien accept Medicare?
- Dennis O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dennis O'Brien's NPI active?
- Yes — Dennis O'Brien's NPI (1043250079) is active in the NPPES registry as of the last update on 2019-11-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.