HUSSEIN MERZA MD
NPI 1235409673
Internal Medicine - Hematology & Oncology in Corona, CA

Q: What is Hussein Merza's NPI number?

The NPI number for Hussein Merza is 1235409673. It was assigned to this individual provider in the NPPES registry on January 3, 2012.

Q: What is Hussein Merza's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Q: When was this NPI record last updated?

The NPPES record for Hussein Merza was last updated on May 27, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.

Active since January 03, 2012PECOS EnrolledAccepts Medicare Assignment

260 E ONTARIO AVE STE 101, CORONA, CA 92879(951) 371-2411(951) 284-0177 Get Directions Write a Review

NPPES record last updated: May 27, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: May 27, 2025, Sep 24, 2020, Sep 17, 2020 and 3 more (6 updates tracked since 2017).

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About Hussein Merza Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

HUSSEIN MERZA MD (NPI 1235409673) is an individual hematology & oncology provider in Corona, California, licensed in California (A168484) and active in the NPI registry since January 2012. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2007).

NPPES Registry Identity

NPI1235409673

Entity TypeIndividualMale

Primary Taxonomy207RH0003X

Provider Legal NameHUSSEIN MERZACredential: MD

Location Address260 E ONTARIO AVE STE 101Corona, CA 92879-3508

Mailing Address260 E Ontario Ave Ste 101Corona, CA 92879-3508 · (951) 371-2411 · Fax (951) 284-0177

Phone(951) 371-2411

Fax(951) 284-0177

Sole ProprietorNo

Medical School CMSOtherGraduated 2007

Enumeration DateJanuary 3, 2012

Last NPPES UpdateMay 27, 20256 updates tracked since enumeration

NPPES CertifiedSeptember 24, 2020

✔ NPI 1235409673 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RH0003X

License✔ Licensed in CA · A168484

Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

Also ListedInternal Medicine · HematologyTaxonomy 207RH0000X · License A168484 (CA)

260 E ONTARIO AVE STE 101, Corona, CA 92879

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Secondary Practice Locations 2

Location 11240 S Cedar Crest Blvd Ste 401Allentown, PA 18103-6218 · Phone (610) 402-7880

Location 2333 Cottman AvePhiladelphia, PA 19111-2434 · Phone (215) 728-6900 · Fax (215) 214-1425

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Hussein Merza Md 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.

PECOS PAC ID5395902803

PECOS Enrollment IDI20200924003253

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 3

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

74 services50 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

31 services17 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

17 services16 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92879 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$179.42 typical visit price

range $59.60 – $179.42

Typical copayment $44.85 (range $14.90 – $44.85)

Most-billed visit code 99205

Established Patient

$104.64 typical visit price

range $19.37 – $146.42

Typical copayment $26.16 (range $4.84 – $36.60)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

TARYN ELIZABETH SOMMERS PA

Physician Assistant