GUISOU MAHMOUD
NPI 1164435996
Emergency Medicine in Emeryville, CA
About Guisou Mahmoud NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GUISOU MAHMOUD (NPI 1164435996) is an individual emergency medicine provider in Emeryville, California, licensed in California (A79774) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1998).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Guisou Mahmoud is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Guisou Mahmoud reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Mission Viejo, CA 92691
- Reassigned Medicare billing, California enrollment
- 86 clinicians in this Medicare group
Laguna Beach, CA 92651
- Reassigned Medicare billing, California enrollment
- 110 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94608 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
EMERYVILLE, CA 94608
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Guisou Mahmoud's NPI number?
The NPI number for Guisou Mahmoud is 1164435996. It was assigned to this individual provider in the NPPES registry on August 14, 2006.
Where is Guisou Mahmoud located?
Guisou Mahmoud practices at 2100 Powell St Suite 900, Emeryville, CA 94608. The listed phone number is (510) 350-2600.
What is Guisou Mahmoud's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Guisou Mahmoud enrolled in Medicare?
Yes. Guisou Mahmoud is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Guisou Mahmoud's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Guisou Mahmoud reassigns Medicare benefits to 2 organizations: Mission Viejo Emergency Medical Associates (Mission Viejo, CA) and Mission Viejo Emergency Medical Associates, Inc. (Laguna Beach, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Guisou Mahmoud's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Guisou Mahmoud was last updated on January 29, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Guisou Mahmoud · NPI 1164435996
Emergency Medicine physician in Emeryville, California. Individual provider, active in the CMS NPPES registry since August 14, 2006.
## Identity
- **NPI:** 1164435996 (Entity type: Individual)
- **Enumerated:** August 14, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A79774 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2100 POWELL ST, SUITE 900, Emeryville, CA 94608-1826
- **Phone:** (510) 350-2600
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Mission Viejo Emergency Medical Associates (NPI 1073542916, Mission Viejo, CA); Mission Viejo Emergency Medical Associates, Inc. (NPI 1134355597, Laguna Beach, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1998
## Record status
- **NPPES last updated:** January 29, 2008
- **Other identifiers:** Medicaid 00A797740 (CA); Medicare PIN WA79774A (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1164435996) · Data from the CMS NPPES public registry.