DR. KOUROSH KHAMOOSHIAN MD
NPI 1659523975
Internal Medicine in La Mesa, CA
About Dr. Kourosh Khamooshian Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KOUROSH KHAMOOSHIAN MD (NPI 1659523975) is an individual internal medicine provider in La Mesa, California, licensed in California (A110901) and active in the NPI registry since October 2008. He is enrolled in Medicare PECOS, maintains a secondary practice location in Rancho Mirage, and is a graduate of Other (1998).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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
Dr. Kourosh Khamooshian Md 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
9Medicare enrollment records show Kourosh Khamooshian reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
La Mesa, CA 91942
- Reassigned Medicare billing, California enrollment
San Diego, CA 92123
- Reassigned Medicare billing, California enrollment
- 1,437 clinicians in this Medicare group
San Diego, CA 92131
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Datnguyen, M.D., Inc.
- 42 clinicians in this Medicare group
Murrieta, CA 92563
- Reassigned Medicare billing, California enrollment
- 48 clinicians in this Medicare group
Rancho Mirage, CA 92270
- Reassigned Medicare billing, California enrollment
- 595 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 clinicians in this Medicare group
Apple Valley, CA 92307
- Reassigned Medicare billing, California enrollment
- 914 clinicians in this Medicare group
Barstow, CA 92311
- Reassigned Medicare billing, California enrollment
- 3 clinicians in this Medicare group
Stockton, CA 95219
- Reassigned Medicare billing, California enrollment
- 221 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 16
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 91942 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Referred Medical Equipment & Supplies CMS DME claims 4
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LA MESA, CA 91942
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 Kourosh Khamooshian's NPI number?
The NPI number for Kourosh Khamooshian is 1659523975. It was assigned to this individual provider in the NPPES registry on October 17, 2008.
Where is Kourosh Khamooshian located?
Kourosh Khamooshian practices at 5565 Grossmont Center Dr Ste 444, La Mesa, CA 91942. The listed phone number is (888) 475-6662.
What is Kourosh Khamooshian's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Kourosh Khamooshian enrolled in Medicare?
Yes. Kourosh Khamooshian 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 Kourosh Khamooshian's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Kourosh Khamooshian reassigns Medicare benefits to 9 organizations: Kourosh Khamooshian MD PC (La Mesa, CA), Emergency And Acute Care Medical Corporation (San Diego, CA), Datnguyen MD Inc (San Diego, CA), Healthcare Crossing Corporation (Murrieta, CA), Eisenhower Medical Center (Rancho Mirage, CA) and 4 more organizations, listed in the Medicare section above. 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 Kourosh Khamooshian'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 Kourosh Khamooshian was last updated on July 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Dr. Kourosh Khamooshian, MD · NPI 1659523975
Internal Medicine physician in La Mesa, California. Individual provider, active in the CMS NPPES registry since October 17, 2008.
## Identity
- **NPI:** 1659523975 (Entity type: Individual)
- **Enumerated:** October 17, 2008
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A110901 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 5565 GROSSMONT CENTER DR STE 444, La Mesa, CA 91942-3020
- **Phone:** (888) 475-6662 · **Fax:** (858) 408-3844
## 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:** 9 organizations under Medicare reassignment (form CMS-855R): Kourosh Khamooshian MD PC (NPI 1194079632, La Mesa, CA); Emergency And Acute Care Medical Corporation (NPI 1437103942, San Diego, CA); Datnguyen MD Inc (NPI 1215977723, San Diego, CA); Healthcare Crossing Corporation (NPI 1518953298, Murrieta, CA); Eisenhower Medical Center (NPI 1003758665, Rancho Mirage, CA); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1998
## Record status
- **NPPES last updated:** July 1, 2025
- **Other identifiers:** Other W14158 (CA); Other DJ1227 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1659523975) · Data from the CMS NPPES public registry.