Amitabha Mazumder, M.D.
Hematology & Oncology Physician · Downey, CA
Amitabha Mazumder, M.D. is a hematology & oncology physician with a practice address in Downey, California, and NPI 1881682318, issued on Oct 10, 2005. Check the license (California G56488, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Amitabha Mazumder
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- G56488 CA
209802 NY
Self-reported in NPPES; status is on the state search - Practice location
- 11480 Brookshire Ave Ste 309, Downey, CA 90241
- Phone
- (562) 869-1201
- Enumerated
- Oct 10, 2005
- Record last updated
- Aug 14, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (562) 869-1281
- Medicare enrollment
- Enrolled (PECOS I20180305001529); accepts Medicare assignment
- Medical or professional school
- Johns Hopkins University School Of Medicine, 1977
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 11480 Brookshire Ave Ste 309
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Soo Chung, M.D.Hematology & Oncology Physician1245293729
- Andrea CuadrasAcute Care Nurse Practitioner1750984746
- Howard Fellows, M.D.Hematology & Oncology Physician1659365526
- Haydee Gonzalez Hidalgo, MDHematology & Oncology Physician1912071481
- Balaganesh Gopurala, MDHematology & Oncology Physician1316967854
- Natasha Salazar, PA-CPhysician Assistant1215401674
Verify Amitabha Mazumder in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G56488Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% more Medicare Part D claims than the average hematology & oncology physician in 2024
1,500 Medicare Part D claims for 250 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims. 50 claims were for opioids.
Most prescribed
- Anastrozole148 claims
- Prednisone81 claims
- Alendronate Sodium67 claims
- Orgovyx59 claims
- Abiraterone Acetate56 claims
- Letrozole45 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $5,997.55
204 payments; by number, the most common kind was food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- The Oncology Institute CA, A Professional CorporationPasadena, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Amitabha Mazumder among 1,583 hematology & oncology physician records in California
Amitabha Mazumder, M.D. is one of 1,583 hematology & oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 92% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1977 · median 2003 among the 1,124 with a school on file
- Record last updated2018 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in Downey → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Richy Agajanian, M.D.Downey, CA 902411922116664
- Nelly Awkar Lazo, M.DDowney, CA 902411326351537
- Chaiyaporn Boonchalermvichian, MDDowney, CA 902411801046867
- Brian Chun Fang Cheng, M.D.Downey, CA 902411215315940
- Soo Chung, M.D.Downey, CA 902411245293729
- Howard Fellows, M.D.Downey, CA 902411659365526
- Anthony Giorgio, MDDowney, CA 902411801902721
- Haydee Gonzalez Hidalgo, MDDowney, CA 902411912071481
Common questions
What is Amitabha Mazumder, M.D.'s NPI number?
Amitabha Mazumder, M.D.'s National Provider Identifier (NPI) is 1881682318, issued on Oct 10, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Amitabha Mazumder, M.D. located?
The NPPES record lists a practice address at 11480 Brookshire Ave Ste 309, Downey, CA, 90241. Phone: (562) 869-1201. Providers update this record themselves, so call before visiting.
How can I verify Amitabha Mazumder, M.D.'s license?
NPPES lists California license number G56488, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Amitabha Mazumder, M.D. prescribe under Medicare Part D?
In 2024, Amitabha Mazumder, M.D. had 1,500 Medicare Part D claims for 250 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.