Quick answers
- Which hospitals does Jon H. Ritter work at?
- Medicare's official clinician data lists Jon H. Ritter at 3 hospitals: Barnes Jewish Hospital, Barnes-Jewish West County Hospital and Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jon H. Ritter see patients?
- Medicare's clinician data lists 1 practice location in Saint Louis, MO. Call before your visit to confirm the address.
- What is Jon H. Ritter's specialty?
- Medicare lists Pathology as the primary specialty.
- Does Jon H. Ritter accept Medicare assignment?
- Yes. Medicare's clinician data says Jon H. Ritter 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 Jon H. Ritter?
- (314) 362-5641, as listed in official Medicare / NPI Registry data.
- What is Jon H. Ritter's NPI number?
- 1366460784. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jon H. Ritter works
Medicare's Facility Affiliation Data lists Jon H. Ritter 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 West County HospitalCreve Coeur, MO · Acute Care Hospital · CCN 260162
- Memorial HospitalBelleville, IL · Acute Care Hospital · CCN 140185
Practice locations
Addresses where Jon H. Ritter is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Barnes Jewish Hospital Plz, Fl 3Saint Louis, MO 63110 (314) 362‑5641
Group practices
Medicare enrollment lists Jon H. Ritter as a member of this group (CMS data updated 2026-10-02).
- Washington University3,029 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Minnesota Homeopathic Medicine - Nlg |
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1366460784 |
| 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