Quick answers
- Which hospitals does Holly Ryan work at?
- Medicare's official clinician data lists Holly Ryan at 1 hospital: Advocate Lutheran General Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Holly Ryan see patients?
- Medicare's clinician data lists 1 practice location in Ottawa, IL. Call before your visit to confirm the address.
- What is Holly Ryan's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Holly Ryan accept Medicare assignment?
- Yes. Medicare's clinician data says Holly Ryan 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 Holly Ryan?
- (815) 433-3100, as listed in official Medicare / NPI Registry data.
- What is Holly Ryan's NPI number?
- 1821739475. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Holly Ryan works
Medicare's Facility Affiliation Data lists Holly Ryan 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
Practice locations
Addresses where Holly Ryan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1100 E Norris DrOttawa, IL 61350 (815) 433‑3100
Group practices
Medicare enrollment lists Holly Ryan as a member of this group (CMS data updated 2026-10-02).
- OSF Multi-Specialty Group2,114 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Ottawa
Clinicians with the same Medicare primary specialty in Ottawa, IL — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2022 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821739475 |
| 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