Margaret O'Brien
NPI 1134700495 · Psychiatry Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret O'Brien is a Psychiatry Physician provider in Chicago, IL (NPI 1134700495).
Provider details
- NPI number
- 1134700495
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
- License
- 036168037 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Trazodone Hcl | 32 | 13 |
| Duloxetine Hcl | 19 | — |
| Sertraline Hcl | 18 | — |
| Lorazepam | 17 | — |
| Escitalopram Oxalate | 16 | — |
| Gabapentin | 14 | — |
| Bupropion Hclbrand: Bupropion Xl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-04-19
- Last updated
- 2025-09-04
- Certified
- 2025-09-04
Frequently asked questions
- What is Margaret O'Brien's NPI number?
- Margaret O'Brien's National Provider Identifier (NPI) is 1134700495, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret O'Brien's specialty?
- Margaret O'Brien is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret O'Brien located?
- Margaret O'Brien's practice location on file with NPPES is 5841 S Maryland Ave # 3077, Chicago, IL 60637-1443.
- What is Margaret O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Margaret O'Brien is (773) 834-0373.
- Does Margaret O'Brien accept Medicare?
- Margaret 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 Margaret O'Brien's NPI active?
- Yes — Margaret O'Brien's NPI (1134700495) is active in the NPPES registry as of the last update on 2025-09-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.