Quick answers
- Does Mary M. Westerholm accept Medicare assignment?
- Yes. Medicare's clinician data says Mary M. Westerholm accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Mary M. Westerholm's NPI number?
- 1790951093. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Mary M. Westerholm is enrolled with Medicare (CMS data updated October 2, 2026).
- 1019 School StLisle, IL 60532 (630) 315‑8800
- 1800 N Main StWheaton, IL 60187 (630) 933‑4800
- 3860 W Ogden AveChicago, IL 60623 (872) 588‑3000
Group practices
Medicare enrollment lists Mary M. Westerholm as a member of these groups (CMS data updated October 2, 2026).
- Central Dupage Physician Group1,080 clinicians in the group
- Lawndale Christian Health Center123 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Lisle
Clinicians with the same Medicare primary specialty in Lisle, IL — not a recommendation.
Other clinicians in Central Dupage Physician Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loyola University Of Chicago, Stritch School Of Medicine |
| Graduation year | 2004 (22 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1790951093 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- 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