SAHAR E. LASHIN M.D.
NPI 1598053894
Internal Medicine in Lake Forest, CA
About Sahar E. Lashin M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SAHAR E. LASHIN M.D. (NPI 1598053894) is an individual internal medicine provider in Lake Forest, California, licensed in California (A127149) and active in the NPI registry since July 2011. She is enrolled in Medicare PECOS and is a graduate of Other (1994).
NPPES Registry Identity
Specialties & Licenses
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
Sahar E. Lashin M.d. 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
4Medicare enrollment records show Sahar Lashin reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Newport Beach, CA 92660
- Reassigned Medicare billing, California enrollment
- 5 clinicians in this Medicare group
Fountain Valley, CA 92708
- Reassigned Medicare billing, California enrollment
- 948 clinicians in this Medicare group
Los Angeles, CA 90048
- Reassigned Medicare billing, California enrollment
- 2,118 clinicians in this Medicare group
Los Angeles, CA 90095
- Reassigned Medicare billing, California enrollment
- 1,766 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
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 92630 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Sahar Lashin's NPI number?
The NPI number for Sahar Lashin is 1598053894. It was assigned to this individual provider in the NPPES registry on July 20, 2011.
Where is Sahar Lashin located?
Sahar Lashin practices at 22972 El Toro Rd # C3, Lake Forest, CA 92630. The listed phone number is (949) 749-1049.
What is Sahar Lashin's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Sahar Lashin enrolled in Medicare?
Yes. Sahar Lashin 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 Sahar Lashin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sahar Lashin reassigns Medicare benefits to 4 organizations: Optimum Medical Clinics Inc (Newport Beach, CA), Memorialcare Medical Foundation (Fountain Valley, CA), Cedars-Sinai Medical Care Foundation (Los Angeles, CA) and The Regents Of The University Of California (Los Angeles, 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 Sahar Lashin'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 Sahar Lashin was last updated on January 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months 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.
# Sahar E. Lashin, M.D. · NPI 1598053894
Internal Medicine physician in Lake Forest, California. Individual provider, active in the CMS NPPES registry since July 20, 2011.
## Identity
- **NPI:** 1598053894 (Entity type: Individual)
- **Enumerated:** July 20, 2011
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A127149 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 22972 EL TORO RD # C3, Lake Forest, CA 92630-4961
- **Phone:** (949) 749-1049 · **Fax:** (949) 749-1048
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Optimum Medical Clinics Inc (NPI 1649354366, Newport Beach, CA); Memorialcare Medical Foundation (NPI 1205167350, Fountain Valley, CA); Cedars-Sinai Medical Care Foundation (NPI 1316984388, Los Angeles, CA); The Regents Of The University Of California (NPI 1235107566, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1994
## Record status
- **NPPES last updated:** January 16, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1598053894) · Data from the CMS NPPES public registry.