Quick answers
- Which hospitals does William T. Leslie work at?
- Medicare's official clinician data lists William T. Leslie at 2 hospitals: Rush Oak Park Hospital and Rush University Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William T. Leslie see patients?
- Medicare's clinician data lists 6 practice locations, including Chicago, IL and Oak Park, IL. Call before your visit to confirm the address.
- What is William T. Leslie's specialty?
- Medicare lists Hematology/Oncology as the primary specialty.
- Does William T. Leslie accept Medicare assignment?
- Yes. Medicare's clinician data says William T. Leslie 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 William T. Leslie offer telehealth?
- Medicare's clinician data says William T. Leslie offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for William T. Leslie?
- (312) 942-5904, as listed in official Medicare / NPI Registry data.
- What is William T. Leslie's NPI number?
- 1538129275. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William T. Leslie works
Medicare's Facility Affiliation Data lists William T. Leslie at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Rush Oak Park HospitalOak Park, IL · Acute Care Hospital · CCN 140063
- Rush University Medical CenterChicago, IL · Acute Care Hospital · CCN 140119
Practice locations
Addresses where William T. Leslie is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1520 W Harrison StChicago, IL 60607 (312) 942‑5904
- 1620 W Harrison StChicago, IL 60612
- 1700 W Van Buren StChicago, IL 60612 (312) 563‑2875
- 520 S Maple AveOak Park, IL 60304 (708) 660‑2240
- 520 S Maple Ave, Fl 3Oak Park, IL 60304 (708) 660‑5900
Group practices
Medicare enrollment lists William T. Leslie as a member of this group (CMS data updated 2026-10-02).
- Rush University Medical Group1,551 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1978 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1538129275 |
| 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