HEMATOLOGY ONCOLOGY SPECIALISTS
NPI 1174685846
Internal Medicine - Hematology & Oncology in Los Angeles, CA
About Hematology Oncology Specialists NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
HEMATOLOGY ONCOLOGY SPECIALISTS (NPI 1174685846) is a healthcare organization registered as a hematology & oncology in Los Angeles, California and active in the NPI registry since December 2006. The organization lists Austin June Ma, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 3
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Hematology Oncology Specialists is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
16Medicare enrollment records show 16 clinicians reassign Medicare billing to Hematology Oncology Specialists, which bills Medicare for the services they deliver. Of these, 6 practice at this address and 8 within 10 miles. They are listed nearest first.
Clinicians by Medicare Specialty 2
Clinicians, nearest first (16)
Los Angeles, CA 90033
Los Angeles, CA 90033
Los Angeles, CA 90033
Los Angeles, CA 90033
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Austin J Ma, M.D., A Professional Corporation's NPI number?
The NPI number for Austin J Ma, M.D., A Professional Corporation is 1174685846. It was assigned to this organization in the NPPES registry on December 15, 2006. The provider is doing business as Hematology Oncology Specialists.
Where is Austin J Ma, M.D., A Professional Corporation located?
Austin J Ma, M.D., A Professional Corporation is located at 1700 E Cesar E Chavez Ave Suite 3500, Los Angeles, CA 90033. The listed phone number is (323) 264-0430.
What is Austin J Ma, M.D., A Professional Corporation's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Austin J Ma, M.D., A Professional Corporation enrolled in Medicare?
Yes. Austin J Ma, M.D., A Professional Corporation is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Austin J Ma, M.D., A Professional Corporation?
According to the CMS Revalidation Reassignment List (October 2026 release), 16 clinicians in 2 Medicare specialties reassign their Medicare billing to Austin J Ma, M.D., A Professional Corporation. A 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 the clinician's services. The largest specialties are Hematology/Oncology (15) and Nurse Practitioner (1). Of these, 6 practice at this address and 8 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
What insurance does Austin J Ma, M.D., A Professional Corporation accept?
Health plans from Alliant Health Plans, Inc., Ambetter Health, Ambetter Health of Delaware, Ambetter from Absolute Total Care and Ambetter from Arkansas Health & Wellness and 38 other insurers list Austin J Ma, M.D., A Professional Corporation as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Austin J Ma, M.D., A Professional Corporation was last updated on April 20, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Hematology Oncology Specialists · NPI 1174685846
Hematology & Oncology organization in Los Angeles, California. Organization record, active in the CMS NPPES registry since December 15, 2006.
## Identity
- **NPI:** 1174685846 (Entity type: Organization)
- **Enumerated:** December 15, 2006
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **Legal business name:** Austin J Ma, M.d., A Professional Corporation
- **Organization subpart:** No
- **Authorized official:** Austin Ma, PRESIDENT
## Practice location
- **Address:** 1700 E CESAR E CHAVEZ AVE, SUITE 3500, Los Angeles, CA 90033-2480
- **Phone:** (323) 264-0430 · **Fax:** (323) 264-2354
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 16 clinicians in 2 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Hematology/Oncology (15), Nurse Practitioner (1); 6 practice at this address and 8 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 20, 2016
- **Other identifiers:** Medicare PIN W15926 (CA); Medicare PIN BP355 (CA); Medicaid 00A463720 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1174685846) · Data from the CMS NPPES public registry.