Sean O'Sullivan, MD/PHD
NPI 1609514702 · Psychiatry Physician · Austin, TX
Enrolled with Medicare as Order and Referring Only - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sean O'Sullivan, MD/PHD is a Psychiatry Physician provider in Austin, TX (NPI 1609514702).
Provider details
- NPI number
- 1609514702
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD/PHD
- Sex
- Male
- Sole proprietor
- No
- License
- BP10079054 (TX)
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
4 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 · 7 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Quetiapine Fumarate | 39 |
| Divalproex Sodiumbrand: Divalproex Sodium Er | 19 |
| Venlafaxine Hclbrand: Venlafaxine Hcl Er | 19 |
| Sertraline Hcl | 16 |
| Gabapentin | 15 |
| Clozapine | 14 |
| Aripiprazole | 13 |
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
Registry dates
- Enumerated
- 2022-05-26
- Last updated
- 2022-05-26
- Certified
- 2022-05-26
Frequently asked questions
- What is Sean O'Sullivan's NPI number?
- Sean O'Sullivan's National Provider Identifier (NPI) is 1609514702, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sean O'Sullivan's specialty?
- Sean O'Sullivan is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Sean O'Sullivan located?
- Sean O'Sullivan's practice location on file with NPPES is 3501 Mills Ave Fl 6, Austin, TX 78731-6309.
- What is Sean O'Sullivan's phone number?
- The practice phone number listed in the NPPES registry for Sean O'Sullivan is (512) 324-2000.
- Does Sean O'Sullivan accept Medicare?
- Sean O'Sullivan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sean O'Sullivan's NPI active?
- Yes — Sean O'Sullivan's NPI (1609514702) is active in the NPPES registry as of the last update on 2022-05-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.