Quick answers
- Which hospitals does John B. Costello work at?
- Medicare's official clinician data lists John B. Costello at 2 hospitals: Mercy Hospital St Louis and Missouri Baptist Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John B. Costello see patients?
- Medicare's clinician data lists 2 practice locations, including St Louis, MO and Saint Louis, MO. Call before your visit to confirm the address.
- What is John B. Costello's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Rheumatology.
- Does John B. Costello accept Medicare assignment?
- Yes. Medicare's clinician data says John B. Costello 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 B. Costello?
- (314) 995-9988, as listed in official Medicare / NPI Registry data.
- What is John B. Costello's NPI number?
- 1417062563. 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 B. Costello works
Medicare's Facility Affiliation Data lists John B. Costello at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · CCN 260020
- Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · CCN 260108
Practice locations
Addresses where John B. Costello is enrolled with Medicare (CMS data updated 2026-10-02).
- 2821 N Ballas Rd, Suite 165St Louis, MO 63131 (314) 995‑9988
- 9594 Manchester RdSaint Louis, MO 63119 (314) 274‑6314
Group practices
Medicare enrollment lists John B. Costello as a member of this group (CMS data updated 2026-10-02).
- Arnold Physical Therapy and Sports Medicine LLC83 clinicians in the group
Specialties
- Internal Medicineprimary
- Rheumatologyalso
Other internal medicine doctors in St Louis
Clinicians with the same Medicare primary specialty in St Louis, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Saint Louis University School Of Medicine |
| Graduation year | 1977 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417062563 |
| 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