DR. AREG GRIGORIAN MD
NPI 1538579578
Surgery - Surgical Critical Care in Orange, CA
About Dr. Areg Grigorian Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. AREG GRIGORIAN MD (NPI 1538579578) is an individual surgical critical care provider in Orange, California, licensed in California (A138676) and active in the NPI registry since April 2014. He is enrolled in Medicare PECOS, maintains a secondary practice location in Los Angeles, and is a graduate of University Of California, San Diego School Of Medicine (2014).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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. Areg Grigorian 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
3Medicare enrollment records show Areg Grigorian reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 180 clinicians in this Medicare group
Santa Ana, CA 92706
- Reassigned Medicare billing, California enrollment
- 204 clinicians in this Medicare group
Los Angeles, CA 90033
- Reassigned Medicare billing, California enrollment
- 2,445 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 11
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.
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.
ORANGE, CA 92868
ORANGE, CA 92868
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 Areg Grigorian's NPI number?
The NPI number for Areg Grigorian is 1538579578. It was assigned to this individual provider in the NPPES registry on April 29, 2014.
Where is Areg Grigorian located?
Areg Grigorian practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (714) 880-7812.
What is Areg Grigorian's specialty?
The primary specialty registered for this NPI is Surgery, specializing in Surgical Critical Care, with taxonomy code 2086S0102X.
Is Areg Grigorian enrolled in Medicare?
Yes. Areg Grigorian 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 Areg Grigorian's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Areg Grigorian reassigns Medicare benefits to 3 organizations: University Surgeons Of Orange A Medical Group (Orange, CA), Knd Development 59 LLC (Santa Ana, CA) and Usc Care Medical Group, Inc (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 Areg Grigorian'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 Areg Grigorian was last updated on December 22, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Areg Grigorian, MD · NPI 1538579578
Surgical Critical Care physician in Orange, California. Individual provider, active in the CMS NPPES registry since April 29, 2014.
## Identity
- **NPI:** 1538579578 (Entity type: Individual)
- **Enumerated:** April 29, 2014
- **Primary specialty:** Surgery - Surgical Critical Care · taxonomy 2086S0102X
- **State license:** A138676 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 THE CITY DR S, Orange, CA 92868-3201
- **Phone:** (714) 880-7812
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): University Surgeons Of Orange A Medical Group (NPI 1407806904, Orange, CA); Knd Development 59 LLC (NPI 1740519081, Santa Ana, CA); Usc Care Medical Group, Inc (NPI 1902846306, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Diego School Of Medicine, class of 2014
## Record status
- **NPPES last updated:** December 22, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1538579578) · Data from the CMS NPPES public registry.