Quick answers
- Which hospitals does Stuart A. Greenfield work at?
- Medicare's official clinician data lists Stuart A. Greenfield at 3 hospitals: Northwestern Lake Forest Hospital, Northwestern Medicine Central Dupage Hospital and Northwestern Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Stuart A. Greenfield see patients?
- Medicare's clinician data lists 7 practice locations, including Chicago, IL and Evanston, IL. Call before your visit to confirm the address.
- What is Stuart A. Greenfield's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty, and also Internal Medicine.
- Does Stuart A. Greenfield accept Medicare assignment?
- Yes. Medicare's clinician data says Stuart A. Greenfield 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 Stuart A. Greenfield?
- (312) 642-9858, as listed in official Medicare / NPI Registry data.
- What is Stuart A. Greenfield's NPI number?
- 1457319477. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Stuart A. Greenfield works
Medicare's Facility Affiliation Data lists Stuart A. Greenfield at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northwestern Lake Forest HospitalLake Forest, IL · Acute Care Hospital · CCN 140130
- Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · CCN 140242
- Northwestern Memorial HospitalChicago, IL · Acute Care Hospital · CCN 140281
Practice locations
Addresses where Stuart A. Greenfield is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 7; the Medicare profile lists all.
- 1333 W Belmont AveChicago, IL 60657
- 150 E Huron St, Suite 800Chicago, IL 60611 (312) 642‑9858
- 1630 Sherman AveEvanston, IL 60201
- 4445 W Irving Park RdChicago, IL 60641
- 635 N Dearborn StChicago, IL 60654 (312) 926‑0404
Group practices
Medicare enrollment lists Stuart A. Greenfield as a member of this group (CMS data updated 2026-10-02).
- Northwestern Medical Faculty Foundation4,503 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Illinois →
Other cardiologists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1457319477 |
| 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