Quick answers
- Which hospitals does Mary O'Brien work at?
- Medicare's official clinician data lists Mary O'Brien at 1 hospital: Norton Hospitals, Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mary O'Brien see patients?
- Medicare's clinician data lists 1 practice location in Louisville, KY. Call before your visit to confirm the address.
- What is Mary O'Brien's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Mary O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Mary O'Brien accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mary O'Brien?
- (502) 894-9494, as listed in official Medicare / NPI Registry data.
- What is Mary O'Brien's NPI number?
- 1083118863. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mary O'Brien works
Medicare's Facility Affiliation Data lists Mary O'Brien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Norton Hospitals, IncLouisville, KY · Acute Care Hospital · CCN 180088
Practice locations
Addresses where Mary O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 4123 Dutchmans Ln, Suite 500Louisville, KY 40207 (502) 894‑9494
Group practices
Medicare enrollment lists Mary O'Brien as a member of this group (CMS data updated 2026-10-02).
- Community Medical Associates Inc1,372 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Louisville
Clinicians with the same Medicare primary specialty in Louisville, KY — not a recommendation.
Clinician information
| Graduation year | 2020 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1083118863 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians