Quick answers
- Does Mary L. Schlegel accept Medicare assignment?
- Yes. Medicare's clinician data says Mary L. Schlegel 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.
- How many Medicare patients does Mary L. Schlegel see?
- In 2024, CMS data shows 221 Original Medicare patients and 293 services for Mary L. Schlegel. This counts Original Medicare only and measures volume, not quality.
- What is Mary L. Schlegel's NPI number?
- 1417989336. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Mary L. Schlegel, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 221 |
|---|---|
| Services billed to Medicare | 293 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Comprehensive hearing and speech recognition test (92557)201 services
- Test to assess middle ear function (92567)38 services
- Test for hearing various pitches using earphone (92552)28 services
- Test for ability to detect and repeat spoken words with speech recognition (92556)17 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol74%
- High blood pressure66%
- Arthritis47%
- Diabetes25%
- Ischemic heart disease25%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)20%
Practice locations
Addresses where Mary L. Schlegel is enrolled with Medicare (CMS data updated October 2, 2026).
- 808 Rickert DrNaperville, IL 60540 (630) 355‑8000
Group practices
Medicare enrollment lists Mary L. Schlegel as a member of this group (CMS data updated October 2, 2026).
- Dupage Medical Group Ltd1,322 clinicians in the group
Specialties
- Qualified Audiologistprimary
Other audiologists in Naperville
Clinicians with the same Medicare primary specialty in Naperville, IL — not a recommendation.
Other clinicians in Dupage Medical Group Ltd
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | AU |
|---|---|
| Graduation year | 2006 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417989336 |
| 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
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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