Hussein Merza, MD
Hematology & Oncology Physician · Corona, CA
Hussein Merza, MD is a hematology & oncology physician with a practice address in Corona, California, and NPI 1235409673, issued on Jan 3, 2012. Check the license (California A168484, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Hussein Merza
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A168484 CA
Self-reported in NPPES; status is on the state search - Practice location
- 260 E Ontario Ave Ste 101, Corona, CA 92879
- Phone
- (951) 371-2411
- Enumerated
- Jan 3, 2012
- Record last updated
- May 27, 2025
- Fax
- (951) 284-0177
- Medicare enrollment
- Enrolled (PECOS I20200924003253); accepts Medicare assignment
- 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 260 E Ontario Ave Ste 101
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nicholas Muff, MDSpecialist1740372861
- Taryn Sommers, PAPhysician Assistant1316291024
Verify Hussein Merza in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A168484Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
281 Medicare Part D claims for 90 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 51% of claims.
Most prescribed
- Keytruda24 claims
- Anastrozole23 claims
- Sodium Chloride17 claims
- Eliquis16 claims
- Hydroxyurea14 claims
- Prednisone12 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: $762.87
33 payments; by number, the most common kind was food and beverage; the largest payer was Celgene 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
- Southern California Permanente Medical GroupPasaden, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hussein Merza among 1,583 hematology & oncology physician records in California
Hussein Merza, MD 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 2012, is newer than 75% of them.
- NPI issued2012 · 75% of these records are older, 21% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2007 · median 2003 among the 1,124 with a school on file
- Record last updated2025 · 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 Corona → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Rehana Baqai, M.D.Corona, CA 928791164478855
- Mohammadbagher Ziari, MDCorona, CA 928791962601047
- Gregory Gilmore, D.O.Corona, CA 928821205271640
- Rahul Dev Polineni, M.DCorona, CA 928821235375155
- Chih-Hong Young, M.D.Corona, CA 928821417919572
- Matthew Keating, M.D.Yorba Linda, CA 928861275948481
- Jeffrey Ahn, M.D.Orange, CA 928681902331630
- Zhaohui Arter, MDOrange, CA 928681184116451
Common questions
What is Hussein Merza, MD's NPI number?
Hussein Merza, MD's National Provider Identifier (NPI) is 1235409673, issued on Jan 3, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Hussein Merza, MD located?
The NPPES record lists a practice address at 260 E Ontario Ave Ste 101, Corona, CA, 92879. Phone: (951) 371-2411. Providers update this record themselves, so call before visiting.
How can I verify Hussein Merza, MD's license?
NPPES lists California license number A168484, 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 Hussein Merza, MD prescribe under Medicare Part D?
In 2024, Hussein Merza, MD had 281 Medicare Part D claims for 90 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.