Quick answers
- Which hospitals does Ava Mastny work at?
- Medicare's official clinician data lists Ava Mastny at 1 hospital: Advocate Christ Hospital & Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ava Mastny see patients?
- Medicare's clinician data lists 3 practice locations, including Palos Heights, IL, Barrington, IL and Libertyville, IL. Call before your visit to confirm the address.
- What is Ava Mastny's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Ava Mastny accept Medicare assignment?
- Yes. Medicare's clinician data says Ava Mastny 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 Ava Mastny?
- (708) 587-0000, as listed in official Medicare / NPI Registry data.
- What is Ava Mastny's NPI number?
- 1164868691. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ava Mastny works
Medicare's Facility Affiliation Data lists Ava Mastny at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Advocate Christ Hospital & Medical CenterOak Lawn, IL · Acute Care Hospital · CCN 140208
Practice locations
Addresses where Ava Mastny is enrolled with Medicare (CMS data updated 2026-10-02).
- 12632 S Harlem AvePalos Heights, IL 60463 (708) 587‑0000
- 450 W Hwy 22Barrington, IL 60010 (847) 381‑9600
- 801 S Milwaukee AveLibertyville, IL 60048 (847) 362‑2900
Group practices
Medicare enrollment lists Ava Mastny as a member of these groups (CMS data updated 2026-10-02).
- Best Practices Inpatient Care, Ltd.82 clinicians in the group
- United Elite Hospitalists LLC25 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Palos Heights
Clinicians with the same Medicare primary specialty in Palos Heights, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1164868691 |
| 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