Quick answers
- Which hospitals does Mark A. Nessim work at?
- Medicare's official clinician data lists Mark A. Nessim at 1 hospital: Presence Mercy Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark A. Nessim see patients?
- Medicare's clinician data lists 4 practice locations, including Dekalb, IL, Oswego, IL and Aurora, IL. Call before your visit to confirm the address.
- What is Mark A. Nessim's specialty?
- Medicare lists Anesthesiology as the primary specialty.
- Does Mark A. Nessim accept Medicare assignment?
- Yes. Medicare's clinician data says Mark A. Nessim 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 Mark A. Nessim?
- (630) 449-0085, as listed in official Medicare / NPI Registry data.
- What is Mark A. Nessim's NPI number?
- 1780840488. 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 A. Nessim works
Medicare's Facility Affiliation Data lists Mark A. Nessim 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
Practice locations
Addresses where Mark A. Nessim is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Kish Hospital DrDekalb, IL 60115
- 100 5th StOswego, IL 60543 (630) 449‑0085
- 1325 N Highland AveAurora, IL 60506 (630) 859‑2222
- 825 S Milwaukee AveLibertyville, IL 60048 (224) 504‑2200
Group practices
Medicare enrollment lists Mark A. Nessim as a member of this group (CMS data updated 2026-10-02).
- Anesthesia Associates, Ltd31 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Dekalb
Clinicians with the same Medicare primary specialty in Dekalb, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1780840488 |
| 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