Quick answers
- Which hospitals does Mary C. Welles work at?
- Medicare's official clinician data lists Mary C. Welles at 1 hospital: Northwestern Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mary C. Welles see patients?
- Medicare's clinician data lists 4 practice locations, including Chicago, IL. Call before your visit to confirm the address.
- What is Mary C. Welles's specialty?
- Medicare lists Certified Clinical Nurse Specialist (CNS) as the primary specialty.
- Does Mary C. Welles accept Medicare assignment?
- Yes. Medicare's clinician data says Mary C. Welles 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 Mary C. Welles?
- (312) 472-3660, as listed in official Medicare / NPI Registry data.
- What is Mary C. Welles's NPI number?
- 1366768764. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mary C. Welles works
Medicare's Facility Affiliation Data lists Mary C. Welles at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northwestern Memorial HospitalChicago, IL · Acute Care Hospital · CCN 140281
Practice locations
Addresses where Mary C. Welles is enrolled with Medicare (CMS data updated 2026-10-02).
- 250 E Superior, 2304 Nwmff Prent Wmn HospChicago, IL 60611 (312) 472‑3660
- 250 E Superior StChicago, IL 60611
- 675 N Saint Clair StChicago, IL 60611
- 675 N St ClairChicago, IL 60611
Group practices
Medicare enrollment lists Mary C. Welles as a member of this group (CMS data updated 2026-10-02).
- Northwestern Medical Faculty Foundation4,503 clinicians in the group
Specialties
Find other clinicians: Certified Clinical Nurse Specialist (CNS), Illinois →
Other clinical nurse specialists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Clinician information
| Medical school | Rush Medical College Of Rush University |
|---|---|
| Graduation year | 1994 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1366768764 |
| 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