Matthew O'Brien, MD
NPI 1376002600 · Psychiatry Physician · Atascadero, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew O'Brien, MD is a Psychiatry Physician provider in Atascadero, CA (NPI 1376002600).
Provider details
- NPI number
- 1376002600
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 180914 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Clozapine | 22 |
| Trazodone Hcl | 13 |
| Clonidine | 12 |
| Glycopyrrolate | 12 |
| Paroxetine Hcl | 12 |
| Clonazepam | 11 |
| Paliperidone Palmitatebrand: Invega Sustenna | 11 |
| Risperidonebrand: Risperidone Odt | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 8019 S. Compton AveLos Angeles, CA 90001Phone: (323) 586-7333
Registry dates
- Enumerated
- 2019-03-16
- Last updated
- 2023-09-28
- Certified
- 2023-09-28
Frequently asked questions
- What is Matthew O'Brien's NPI number?
- Matthew O'Brien's National Provider Identifier (NPI) is 1376002600, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew O'Brien's specialty?
- Matthew O'Brien is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew O'Brien located?
- Matthew O'Brien's practice location on file with NPPES is 10333 El Camino Real, Atascadero, CA 93422-5808.
- What is Matthew O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Matthew O'Brien is (805) 468-2000.
- Does Matthew O'Brien accept Medicare?
- Matthew 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 Matthew O'Brien's NPI active?
- Yes — Matthew O'Brien's NPI (1376002600) is active in the NPPES registry as of the last update on 2023-09-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.