DR. KAMYAR NADER M.D.
NPI 1528304524
Internal Medicine - Hematology & Oncology in Orange, CA
About Dr. Kamyar Nader M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KAMYAR NADER M.D. (NPI 1528304524) is an individual hematology & oncology provider in Orange, California, licensed in California (C205416) and active in the NPI registry since December 2012. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2010).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 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. Kamyar Nader 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
5Medicare enrollment records show Kamyar Nader reassigns Medicare billing to 5 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
- 525 clinicians in this Medicare group
Washington, DC 20007
- Reassigned Medicare billing, District of Columbia enrollment
- 3,530 clinicians in this Medicare group
Washington, DC 20010
- Reassigned Medicare billing, District of Columbia enrollment
- Medicare enrollment name: Whc Physician Group LLC
- 613 clinicians in this Medicare group
Camden, NJ 08103
- Reassigned Medicare billing, New Jersey enrollment
- 78 clinicians in this Medicare group
Browns Mills, NJ 08015
- Reassigned Medicare billing, New Jersey enrollment
- 222 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 92868 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.
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 Kamyar Nader's NPI number?
The NPI number for Kamyar Nader is 1528304524. It was assigned to this individual provider in the NPPES registry on December 19, 2012.
Where is Kamyar Nader located?
Kamyar Nader practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (714) 456-8888.
What is Kamyar Nader's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Kamyar Nader enrolled in Medicare?
Yes. Kamyar Nader 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 Kamyar Nader's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Kamyar Nader reassigns Medicare benefits to 5 organizations: Uc Regents (Orange, CA), Medstar Medical Group II LLC (Washington, DC), Whc Emerg Phys (Washington, DC), Cmc Department Of Medicine Group PA (Camden, NJ) and Professional Service Fund Of Deborah Heart & Lung Center (Browns Mills, NJ). 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 Kamyar Nader'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 Kamyar Nader was last updated on December 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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. Kamyar Nader, M.D. · NPI 1528304524
Hematology & Oncology physician in Orange, California. Individual provider, active in the CMS NPPES registry since December 19, 2012.
## Identity
- **NPI:** 1528304524 (Entity type: Individual)
- **Enumerated:** December 19, 2012
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** C205416 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 101 THE CITY DR S, Orange, CA 92868-3201
- **Phone:** (714) 456-8888
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Uc Regents (NPI 1003864174, Orange, CA); Medstar Medical Group II LLC (NPI 1205562816, Washington, DC); Whc Emerg Phys (NPI 1306260625, Washington, DC); Cmc Department Of Medicine Group PA (NPI 1386682094, Camden, NJ); Professional Service Fund Of Deborah Heart & Lung Center (NPI 1407803596, Browns Mills, NJ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2010
## Record status
- **NPPES last updated:** December 5, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1528304524) · Data from the CMS NPPES public registry.