Quick answers
- Does Theresa M. Zaker accept Medicare assignment?
- Yes. Medicare's clinician data says Theresa M. Zaker 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 Theresa M. Zaker see?
- In 2024, CMS data shows 13 Original Medicare patients and 15 services for Theresa M. Zaker. This counts Original Medicare only and measures volume, not quality.
- What is Theresa M. Zaker's NPI number?
- 1518164664. 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 Theresa M. Zaker, 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 | 13 |
|---|---|
| Services billed to Medicare | 15 |
| Different services or procedures | 4 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
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 blood pressure75%
- High cholesterol75%
Practice locations
Addresses where Theresa M. Zaker is enrolled with Medicare (CMS data updated October 2, 2026).
- 9602 S Roberts RdHickory Hills, IL 60457 (708) 237‑2020
Group practices
Medicare enrollment lists Theresa M. Zaker as a member of this group (CMS data updated October 2, 2026).
- Family Vision Center, Inc.2 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Other clinicians in Family Vision Center, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Illinois College Of Optometry At Chicago |
| Graduation year | 2007 (19 years since optometry school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518164664 |
| 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