Arash Mahajerin, M.D.
NPI 1033315247 · Pediatric Hematology & Oncology Physician · Orange, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Arash Mahajerin, M.D. is a Pediatric Hematology & Oncology Physician provider in Orange, CA (NPI 1033315247).
Provider details
- NPI number
- 1033315247
- Entity type
- Individual
- Primary specialty
- Pediatric Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A126238 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 1201 W La Veta AveDivision of HematologyOrange, CA 92868-4203Phone: (714) 532-8459Fax: (714) 532-8771
Registry dates
- Enumerated
- 2007-06-25
- Last updated
- 2023-03-14
- Certified
- 2023-03-14
Frequently asked questions
- What is Arash Mahajerin's NPI number?
- Arash Mahajerin's National Provider Identifier (NPI) is 1033315247, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Arash Mahajerin's specialty?
- Arash Mahajerin is listed in the NPPES registry with a primary specialty of Pediatric Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Arash Mahajerin located?
- Arash Mahajerin's practice location on file with NPPES is 101 the City Dr S Bldg 23, Orange, CA 92868-3201.
- What is Arash Mahajerin's phone number?
- The practice phone number listed in the NPPES registry for Arash Mahajerin is (714) 456-8000.
- Does Arash Mahajerin accept Medicare?
- Arash Mahajerin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Arash Mahajerin's NPI active?
- Yes — Arash Mahajerin's NPI (1033315247) is active in the NPPES registry as of the last update on 2023-03-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.