Quick answers
- Where does James D. Keller see patients?
- Medicare's clinician data lists 1 practice location in St Charles, IL. Call before your visit to confirm the address.
- What is James D. Keller's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does James D. Keller accept Medicare assignment?
- Yes. Medicare's clinician data says James D. Keller 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 James D. Keller?
- (630) 897-6044, as listed in official Medicare / NPI Registry data.
- What is James D. Keller's NPI number?
- 1639107360. 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 James D. Keller is enrolled with Medicare (CMS data updated 2026-10-02).
- 3310 W Main St, Suite 200St Charles, IL 60175 (630) 897‑6044
Group practices
Medicare enrollment lists James D. Keller as a member of this group (CMS data updated 2026-10-02).
- Advocate Health and Hospitals Corporation3,118 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Michigan College Of Medicine And Surgery |
| Graduation year | 1984 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639107360 |
| 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