Quick answers
- Which hospitals does Gary Altwerger work at?
- Medicare's official clinician data lists Gary Altwerger at 5 hospitals: The University of Chicago Medical Center, UChicago Medicine AdventHealth Bolingbrook, UChicago Medicine AdventHealth Hinsdale, UChicago Medicine AdventHealth La Grange and Yale-New Haven Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gary Altwerger see patients?
- Medicare's clinician data lists 2 practice locations, including Hinsdale, IL and Chicago, IL. Call before your visit to confirm the address.
- What is Gary Altwerger's specialty?
- Medicare lists Gynecological Oncology as the primary specialty, and also Obstetrics/Gynecology.
- Does Gary Altwerger accept Medicare assignment?
- Yes. Medicare's clinician data says Gary Altwerger 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.
- Does Gary Altwerger offer telehealth?
- Medicare's clinician data says Gary Altwerger offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Gary Altwerger?
- (630) 286-5500, as listed in official Medicare / NPI Registry data.
- What is Gary Altwerger's NPI number?
- 1407114630. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gary Altwerger works
Medicare's Facility Affiliation Data lists Gary Altwerger at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- The University of Chicago Medical CenterChicago, IL · Acute Care Hospital · CCN 140088
- UChicago Medicine AdventHealth BolingbrookBolingbrook, IL · Acute Care Hospital · CCN 140304
- UChicago Medicine AdventHealth HinsdaleHinsdale, IL · Acute Care Hospital · CCN 140122
- UChicago Medicine AdventHealth La GrangeLa Grange, IL · Acute Care Hospital · CCN 140065
- Yale-New Haven HospitalNew Haven, CT · Acute Care Hospital · CCN 070022
Practice locations
Addresses where Gary Altwerger is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Salt Creek Ln, Suite 100Hinsdale, IL 60521 (630) 286‑5500
- 5841 S Maryland AveChicago, IL 60637 (888) 824‑0200
Group practices
Medicare enrollment lists Gary Altwerger as a member of these groups (CMS data updated 2026-10-02).
- University of Chicago1,712 clinicians in the group
- Ahp Specialty Care NFP31 clinicians in the group
Specialties
- Gynecological Oncologyprimary
- Obstetrics/Gynecologyalso
Other gynecologic oncologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1407114630 |
| 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