Quick answers
- Where does Jerrie J. Posthumus see patients?
- Medicare's clinician data lists 2 practice locations, including Flossmoor, IL and Oak Lawn, IL. Call before your visit to confirm the address.
- What is Jerrie J. Posthumus's specialty?
- Medicare lists Certified Registered Nurse Anesthetist (CRNA) as the primary specialty.
- Does Jerrie J. Posthumus accept Medicare assignment?
- Yes. Medicare's clinician data says Jerrie J. Posthumus 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 Jerrie J. Posthumus?
- (708) 798-5838, as listed in official Medicare / NPI Registry data.
- What is Jerrie J. Posthumus's NPI number?
- 1164463899. 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 Jerrie J. Posthumus is enrolled with Medicare (CMS data updated 2026-10-02).
- 19624 Governors HwyFlossmoor, IL 60422 (708) 798‑5838
- 9921 Southwest HwyOak Lawn, IL 60453 (708) 425‑2552
Group practices
Medicare enrollment lists Jerrie J. Posthumus as a member of these groups (CMS data updated 2026-10-02).
- Lake Anesthesia Associates8 clinicians in the group
- Amsurg Oak Lawn Il Anesthesia LLC7 clinicians in the group
Specialties
Find other clinicians: Certified Registered Nurse Anesthetist (CRNA), Illinois →
Other nurse anesthetists in Flossmoor
Clinicians with the same Medicare primary specialty in Flossmoor, IL — not a recommendation.
Clinician information
| Credential | CNA |
|---|---|
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1164463899 |
| 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 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