Quick answers
- Does Marc R. Cohen accept Medicare assignment?
- Yes. Medicare's clinician data says Marc R. Cohen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Marc R. Cohen see?
- In 2024, CMS data shows 175 Original Medicare patients and 225 services for Marc R. Cohen. This counts Original Medicare only and measures volume, not quality.
- What is Marc R. Cohen's NPI number?
- 1609811876. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Marc R. Cohen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 175 |
|---|---|
| Services billed to Medicare | 225 |
| Different services or procedures | 17 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Emergency department visit with high level of medical decision making (99285)108 services
- Critical care, first 30-74 minutes (99291)50 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)36 services
- Emergency department visit with moderate level of medical decision making (99284)14 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis54%
- Anxiety37%
- Atrial fibrillation37%
- Ischemic heart disease35%
Hospitals where Marc R. Cohen works
Medicare's Facility Affiliation Data lists Marc R. Cohen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Providence Mission HospitalMission Viejo, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050567
Practice locations
Addresses where Marc R. Cohen is enrolled with Medicare (CMS data updated October 2, 2026).
- 27700 Medical Ctr RdMission Viejo, CA 92691 (949) 365‑2202
Group practices
Medicare enrollment lists Marc R. Cohen as a member of this group (CMS data updated October 2, 2026).
- Mission Viejo Emergency Medical Associates18 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Mission Viejo
Clinicians with the same Medicare primary specialty in Mission Viejo, CA — not a recommendation.
Other clinicians in Mission Viejo Emergency Medical Associates
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Stanford University School Of Medicine |
| Graduation year | 1999 (27 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1609811876 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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