Quick answers
- Which hospitals does William L. Hollabaugh work at?
- Medicare's official clinician data lists William L. Hollabaugh at 2 hospitals: Barnes Jewish Hospital and Missouri Baptist Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William L. Hollabaugh see patients?
- Medicare's clinician data lists 2 practice locations, including Chesterfield, MO and O Fallon, MO. Call before your visit to confirm the address.
- What is William L. Hollabaugh's specialty?
- Medicare lists Sports Medicine as the primary specialty, and also Pediatric Medicine.
- Does William L. Hollabaugh accept Medicare assignment?
- Yes. Medicare's clinician data says William L. Hollabaugh 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 William L. Hollabaugh?
- (314) 514-3500, as listed in official Medicare / NPI Registry data.
- What is William L. Hollabaugh's NPI number?
- 1659868040. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William L. Hollabaugh works
Medicare's Facility Affiliation Data lists William L. Hollabaugh 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
- Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · CCN 260108
Practice locations
Addresses where William L. Hollabaugh is enrolled with Medicare (CMS data updated 2026-10-02).
- 13001 N Outer 40 Rd, Suite 1cChesterfield, MO 63017 (314) 514‑3500
- 20 Progress Point Pkwy, Suite 114O Fallon, MO 63368 (314) 514‑3500
Group practices
Medicare enrollment lists William L. Hollabaugh as a member of this group (CMS data updated 2026-10-02).
- Washington University3,029 clinicians in the group
Specialties
- Sports Medicineprimary
- Pediatric Medicinealso
Other sports medicine doctors in Missouri
Clinicians with the same Medicare primary specialty in Missouri — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659868040 |
| 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