Quick answers
- Does Tania M. Messmer accept Medicare assignment?
- Yes. Medicare's clinician data says Tania M. Messmer 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 Tania M. Messmer's NPI number?
- 1528000114. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Tania M. Messmer works
Medicare's Facility Affiliation Data lists Tania M. Messmer at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Advocate Christ Hospital & Medical CenterOak Lawn, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140208
Practice locations
Addresses where Tania M. Messmer is enrolled with Medicare (CMS data updated October 2, 2026).
- 1880 W Winchester Rd, Suite 201Libertyville, IL 60048
- 4440 W 95th StOak Lawn, IL 60453 (708) 684‑8000
Group practices
Medicare enrollment lists Tania M. Messmer as a member of this group (CMS data updated October 2, 2026).
- Gi Partners of Illinois PLLC39 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Libertyville
Clinicians with the same Medicare primary specialty in Libertyville, IL — not a recommendation.
Other clinicians in Gi Partners of Illinois PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2005 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1528000114 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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