Quick answers
- Does Guisou Mahmoud accept Medicare assignment?
- Yes. Medicare's clinician data says Guisou Mahmoud 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 Guisou Mahmoud see?
- In 2024, CMS data shows 133 Original Medicare patients and 192 services for Guisou Mahmoud. This counts Original Medicare only and measures volume, not quality.
- What is Guisou Mahmoud's NPI number?
- 1164435996. 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 Guisou Mahmoud, 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 | 133 |
|---|---|
| Services billed to Medicare | 192 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)54 services
- Emergency department visit with high level of medical decision making (99285)54 services
- Emergency department visit with moderate level of medical decision making (99284)36 services
- Critical care, first 30-74 minutes (99291)29 services
- Emergency department visit with low level of medical decision making (99283)12 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 cholesterol71%
- High blood pressure69%
- Arthritis56%
- Anxiety29%
- Ischemic heart disease26%
- Depression26%
Hospitals where Guisou Mahmoud works
Medicare's Facility Affiliation Data lists Guisou Mahmoud 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 Guisou Mahmoud is enrolled with Medicare (CMS data updated October 2, 2026).
- 31872 Coast HwyLaguna Beach, CA 92651 (949) 499‑7193
Group practices
Medicare enrollment lists Guisou Mahmoud as a member of this group (CMS data updated October 2, 2026).
- Mission Viejo Emergency Medical Associates, Inc.30 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Mission Viejo Emergency Medical Associates, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1998 (28 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1164435996 |
| 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