Quick answers
- Which hospitals does Leonid I. Groysman work at?
- Medicare's official clinician data lists Leonid I. Groysman at 2 hospitals: Memorialcare Orange Coast Medical Center and Memorialcare Saddleback Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Leonid I. Groysman see patients?
- Medicare's clinician data lists 1 practice location in Costa Mesa, CA. Call before your visit to confirm the address.
- What is Leonid I. Groysman's specialty?
- Medicare lists Neurology as the primary specialty, and also Critical Care (Intensivists).
- Does Leonid I. Groysman accept Medicare assignment?
- Yes. Medicare's clinician data says Leonid I. Groysman 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 Leonid I. Groysman?
- (714) 557-6300, as listed in official Medicare / NPI Registry data.
- What is Leonid I. Groysman's NPI number?
- 1104076785. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Leonid I. Groysman works
Medicare's Facility Affiliation Data lists Leonid I. Groysman at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Memorialcare Orange Coast Medical CenterFountain Valley, CA · Acute Care Hospital · CCN 050678
- Memorialcare Saddleback Medical CenterLaguna Hills, CA · Acute Care Hospital · CCN 050603
Practice locations
Addresses where Leonid I. Groysman is enrolled with Medicare (CMS data updated 2026-10-02).
- 722 Baker StCosta Mesa, CA 92626 (714) 557‑6300
Group practices
Medicare enrollment lists Leonid I. Groysman as a member of this group (CMS data updated 2026-10-02).
- Memorialcare Medical Foundation566 clinicians in the group
Specialties
- Neurologyprimary
- Critical Care (Intensivists)also
Other neurologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104076785 |
| 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