Quick answers
- Which hospitals does Mark Leischner work at?
- Medicare's official clinician data lists Mark Leischner at 5 hospitals: Advocate Illinois Masonic Medical Center, Presence Saint Joseph Hospital - Chicago, Presence Saints Mary and Elizabeth Medical Center, Swedish Hospital and Thorek Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Leischner see patients?
- Medicare's clinician data lists 11 practice locations, including Chicago, IL. Call before your visit to confirm the address.
- What is Mark Leischner's specialty?
- Medicare lists Nephrology as the primary specialty, and also Internal Medicine.
- Does Mark Leischner accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Leischner 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 Mark Leischner offer telehealth?
- Medicare's clinician data says Mark Leischner offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark Leischner?
- (312) 733-7335, as listed in official Medicare / NPI Registry data.
- What is Mark Leischner's NPI number?
- 1598708877. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark Leischner works
Medicare's Facility Affiliation Data lists Mark Leischner at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Advocate Illinois Masonic Medical CenterChicago, IL · Acute Care Hospital · CCN 140182
- Presence Saint Joseph Hospital - ChicagoChicago, IL · Acute Care Hospital · CCN 140224
- Presence Saints Mary and Elizabeth Medical CenterChicago, IL · Acute Care Hospital · CCN 140180
- Swedish HospitalChicago, IL · Acute Care Hospital · CCN 140114
- Thorek Memorial HospitalChicago, IL · Acute Care Hospital · CCN 140115
Practice locations
Addresses where Mark Leischner is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 11; the Medicare profile lists all.
- 215 S Aberdeen StChicago, IL 60607 (312) 733‑7335
- 2233 W Division StChicago, IL 60622 (312) 770‑2000
- 2608 W Addison StChicago, IL 60618 (773) 756‑3333
- 2620 W Addison StChicago, IL 60618 (773) 248‑0462
- 2900 N Lake Shore DrChicago, IL 60657 (773) 665‑3000
Group practices
Medicare enrollment lists Mark Leischner as a member of this group (CMS data updated 2026-10-02).
- Associates in Nephrology SC52 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loyola University Of Chicago, Stritch School Of Medicine |
| Graduation year | 2001 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1598708877 |
| 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