Quick answers
- Which hospitals does Charlotte A. O'Brien work at?
- Medicare's official clinician data lists Charlotte A. O'Brien at 2 hospitals: Advocate Lutheran General Hospital and AMITA Health Resurrection Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Charlotte A. O'Brien see patients?
- Medicare's clinician data lists 1 practice location in Chicago, IL. Call before your visit to confirm the address.
- What is Charlotte A. O'Brien's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Charlotte A. O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Charlotte A. 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 Charlotte A. O'Brien?
- (773) 285-9304, as listed in official Medicare / NPI Registry data.
- What is Charlotte A. O'Brien's NPI number?
- 1902123938. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Charlotte A. O'Brien works
Medicare's Facility Affiliation Data lists Charlotte A. O'Brien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Advocate Lutheran General HospitalPark Ridge, IL · Acute Care Hospital · CCN 140223
- AMITA Health Resurrection Medical CenterChicago, IL · Acute Care Hospital · CCN 140117
Practice locations
Addresses where Charlotte A. O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 4318 S State StChicago, IL 60609 (773) 285‑9304
Group practices
Medicare enrollment lists Charlotte A. O'Brien as a member of this group (CMS data updated 2026-10-02).
- Oak Street Health Physicians Group PC229 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2008 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1902123938 |
| 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