Quick answers
- Which hospitals does Mary Koumas work at?
- Medicare's official clinician data lists Mary Koumas at 2 hospitals: Memorialcare Saddleback Medical Center and Providence Mission Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mary Koumas see patients?
- Medicare's clinician data lists 1 practice location in Lake Forest, CA. Call before your visit to confirm the address.
- What is Mary Koumas's specialty?
- Medicare lists Family Practice as the primary specialty, and also Osteopathic Manipulative Medicine.
- Does Mary Koumas accept Medicare assignment?
- Yes. Medicare's clinician data says Mary Koumas 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 Mary Koumas offer telehealth?
- Medicare's clinician data says Mary Koumas offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mary Koumas?
- (949) 770-1950, as listed in official Medicare / NPI Registry data.
- What is Mary Koumas's NPI number?
- 1306838909. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mary Koumas works
Medicare's Facility Affiliation Data lists Mary Koumas at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Memorialcare Saddleback Medical CenterLaguna Hills, CA · Acute Care Hospital · CCN 050603
- Providence Mission HospitalMission Viejo, CA · Acute Care Hospital · CCN 050567
Practice locations
Addresses where Mary Koumas is enrolled with Medicare (CMS data updated 2026-10-02).
- 24401 Muirlands Blvd, Suite ALake Forest, CA 92630 (949) 770‑1950
Group practices
Medicare enrollment lists Mary Koumas as a member of this group (CMS data updated 2026-10-02).
- Lake Forest Medical Group, Inc.2 clinicians in the group
Specialties
Other family doctors in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | At Still University Of Health Sciences, College Of Osteo Med, Kirksville |
| Graduation year | 1978 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1306838909 |
| 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