Quick answers
- Which hospitals does John E. Hartweger work at?
- Medicare's official clinician data lists John E. Hartweger at 3 hospitals: Barnes Jewish Hospital, Barnes-Jewish St Peters Hospital and Missouri Baptist Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John E. Hartweger see patients?
- Medicare's clinician data lists 1 practice location in Saint Peters, MO. Call before your visit to confirm the address.
- What is John E. Hartweger's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does John E. Hartweger accept Medicare assignment?
- Yes. Medicare's clinician data says John E. Hartweger 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 John E. Hartweger?
- (800) 501-9855, as listed in official Medicare / NPI Registry data.
- What is John E. Hartweger's NPI number?
- 1366443756. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John E. Hartweger works
Medicare's Facility Affiliation Data lists John E. Hartweger at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Barnes Jewish HospitalSaint Louis, MO · Acute Care Hospital · CCN 260032
- Barnes-Jewish St Peters HospitalSaint Peters, MO · Acute Care Hospital · CCN 260191
- Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · CCN 260108
Practice locations
Addresses where John E. Hartweger is enrolled with Medicare (CMS data updated 2026-10-02).
- 10 Hospital DrSaint Peters, MO 63376 (800) 501‑9855
Group practices
Medicare enrollment lists John E. Hartweger as a member of this group (CMS data updated 2026-10-02).
- Southeastern Physician Services PC593 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Saint Peters
Clinicians with the same Medicare primary specialty in Saint Peters, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Missouri, Kansas City, School Of Medicine |
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1366443756 |
| 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 2026-10-02, retrieved 2026-10-29
- 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