Quick answers
- Which hospitals does Thomas J. Mark work at?
- Medicare's official clinician data lists Thomas J. Mark at 5 hospitals: Presence Mercy Medical Center, Presence Saints Mary and Elizabeth Medical Center, Riverside Medical Center, Saint Joseph Medical Center and Silver Cross Hospital and Medical Centers. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Thomas J. Mark see patients?
- Medicare's clinician data lists 2 practice locations, including Des Plaines, IL and Joliet, IL. Call before your visit to confirm the address.
- What is Thomas J. Mark's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Thomas J. Mark accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas J. Mark 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 Thomas J. Mark?
- (847) 297-1800, as listed in official Medicare / NPI Registry data.
- What is Thomas J. Mark's NPI number?
- 1255577649. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Thomas J. Mark works
Medicare's Facility Affiliation Data lists Thomas J. Mark at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Presence Mercy Medical CenterAurora, IL · Acute Care Hospital · CCN 140174
- Presence Saints Mary and Elizabeth Medical CenterChicago, IL · Acute Care Hospital · CCN 140180
- Riverside Medical CenterKankakee, IL · Acute Care Hospital · CCN 140186
- Saint Joseph Medical CenterJoliet, IL · Acute Care Hospital · CCN 140007
- Silver Cross Hospital and Medical CentersNew Lenox, IL · Acute Care Hospital · CCN 140213
Practice locations
Addresses where Thomas J. Mark is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 N River RdDes Plaines, IL 60016 (847) 297‑1800
- 201 N Hammes AveJoliet, IL 60435 (224) 273‑6350
Group practices
Medicare enrollment lists Thomas J. Mark as a member of this group (CMS data updated 2026-10-02).
- Prime Healthcare Illinois Medical Group LLC322 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Des Plaines
Clinicians with the same Medicare primary specialty in Des Plaines, IL — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2008 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1255577649 |
| 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