Quick answers
- Which hospitals does Leonard S. Marks work at?
- Medicare's official clinician data lists Leonard S. Marks at 4 hospitals: French Hospital Medical Center, Hoag Memorial Hospital Presbyterian, Ronald Reagan UCLA Medical Center and Santa Monica - UCLA Med Ctr & Orthopaedic Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Leonard S. Marks see patients?
- Medicare's clinician data lists 4 practice locations, including Los Angeles, CA. Call before your visit to confirm the address.
- What is Leonard S. Marks's specialty?
- Medicare lists Urology as the primary specialty.
- Does Leonard S. Marks accept Medicare assignment?
- Yes. Medicare's clinician data says Leonard S. Marks 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.
- Does Leonard S. Marks offer telehealth?
- Medicare's clinician data says Leonard S. Marks offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Leonard S. Marks?
- (310) 825-5986, as listed in official Medicare / NPI Registry data.
- What is Leonard S. Marks's NPI number?
- 1811037450. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Leonard S. Marks works
Medicare's Facility Affiliation Data lists Leonard S. Marks at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- French Hospital Medical CenterSan Luis Obispo, CA · Acute Care Hospital · CCN 050232
- Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · CCN 050224
- Ronald Reagan UCLA Medical CenterLos Angeles, CA · Acute Care Hospital · CCN 050262
- Santa Monica - UCLA Med Ctr & Orthopaedic HospitalSanta Monica, CA · Acute Care Hospital · CCN 050112
Practice locations
Addresses where Leonard S. Marks is enrolled with Medicare (CMS data updated 2026-10-02).
- 200 UCLA Medical Plz, Suite 140Los Angeles, CA 90095 (310) 825‑5986
- 200 UCLA Medical Plz, Suite B265Los Angeles, CA 90095 (310) 825‑0128
- 300 Stein Plaza, Fl 3 Suite 331Los Angeles, CA 90095 (310) 794‑8492
- 300 Stein Plz, Fl 3Los Angeles, CA 90095 (310) 794‑7700
Group practices
Medicare enrollment lists Leonard S. Marks as a member of this group (CMS data updated 2026-10-02).
- The Regents of the University of California48 clinicians in the group
Specialties
- Urologyprimary
Other urologists in Los Angeles
Clinicians with the same Medicare primary specialty in Los Angeles, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical Branch At Galveston |
| Graduation year | 1969 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1811037450 |
| 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