Quick answers
- Which hospitals does Thomas John work at?
- Medicare's official clinician data lists Thomas John at 2 hospitals: Advocate Christ Hospital & Medical Center and Advocate Trinity Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Thomas John see patients?
- Medicare's clinician data lists 3 practice locations, including Oak Brook, IL, Tinley Park, IL and Hazel Crest, IL. Call before your visit to confirm the address.
- What is Thomas John's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Thomas John accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas John 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 John?
- (630) 573-0360, as listed in official Medicare / NPI Registry data.
- What is Thomas John's NPI number?
- 1457351041. 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 John works
Medicare's Facility Affiliation Data lists Thomas John 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
- Advocate Trinity HospitalChicago, IL · Acute Care Hospital · CCN 140048
Practice locations
Addresses where Thomas John is enrolled with Medicare (CMS data updated 2026-10-02).
- 120 Oakbrook Ctr, Suite 201Oak Brook, IL 60523 (630) 573‑0360
- 16532 S Oak Park Ave, Suite 201Tinley Park, IL 60477 (708) 429‑2223
- 17800 Kedzie AveHazel Crest, IL 60429 (708) 799‑8000
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1977 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1457351041 |
| 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