Quick answers
- Which hospitals does Leslie S. Massad work at?
- Medicare's official clinician data lists Leslie S. Massad at 1 hospital: Barnes Jewish Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Leslie S. Massad see patients?
- Medicare's clinician data lists 1 practice location in Saint Louis, MO. Call before your visit to confirm the address.
- What is Leslie S. Massad's specialty?
- Medicare lists Gynecological Oncology as the primary specialty, and also Obstetrics/Gynecology.
- Does Leslie S. Massad accept Medicare assignment?
- Yes. Medicare's clinician data says Leslie S. Massad 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 Leslie S. Massad?
- (314) 747-8274, as listed in official Medicare / NPI Registry data.
- What is Leslie S. Massad's NPI number?
- 1366423360. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Leslie S. Massad works
Medicare's Facility Affiliation Data lists Leslie S. Massad 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
Practice locations
Addresses where Leslie S. Massad is enrolled with Medicare (CMS data updated 2026-10-02).
- 660 S Euclid AveSaint Louis, MO 63110 (314) 747‑8274
Group practices
Medicare enrollment lists Leslie S. Massad as a member of this group (CMS data updated 2026-10-02).
- Washington University3,029 clinicians in the group
Specialties
- Gynecological Oncologyprimary
- Obstetrics/Gynecologyalso
Other gynecologic oncologists in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Duke University School Of Medicine |
| Graduation year | 1984 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1366423360 |
| 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