Quick answers
- Does Thomas R. Whalen accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas R. Whalen 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 Thomas R. Whalen's NPI number?
- 1356364541. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Thomas R. Whalen works
Medicare's Facility Affiliation Data lists Thomas R. Whalen 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.
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260020
Practice locations
Addresses where Thomas R. Whalen is enrolled with Medicare (CMS data updated October 2, 2026).
- 615 S New Ballas RdSaint Louis, MO 63141 (636) 251‑6000
- 615 S New Ballas RdSt Louis, MO 63141
- 615 S New Ballas Rd, Mercy Jfk ClinicSt Louis, MO 63141 (314) 251‑6382
- 621 S New Ballas RdSt Louis, MO 63141 (314) 251‑6092
Group practices
Medicare enrollment lists Thomas R. Whalen as a member of these groups (CMS data updated October 2, 2026).
- Mercy Hospitals East Communities98 clinicians in the group
- Mercy Womens Services LLC13 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Other clinicians in Mercy Hospitals East Communities
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Missouri, Columbia School Of Medicine |
| Graduation year | 1992 (34 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1356364541 |
| 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