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

NPI Status: Active since January 03, 2012

Contact Information

260 E ONTARIO AVE STE 101
CORONA, CA
ZIP 92879
Phone: (951) 371-2411
Fax: (951) 284-0177

Get Directions Write a Review

  • Individual
  • Male
  • Years of Experience 19
  • Internal Medicine
  • Hematology & Oncology
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About HUSSEIN MERZA

This page provides the complete NPI Profile along with additional information for Hussein Merza, an internist established in Corona, California with a medical specialization in Internal Medicine, focusing in hematology & oncology and more than 19 years of experience. The healthcare provider is registered in the NPI registry with number 1235409673 assigned on January 2012. The practitioner's primary taxonomy code is 207RH0003X with license number A168484 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.

NPI
1235409673
Provider Name
HUSSEIN MERZA MD
Gender
Male
Entity Type
Individual
Location Address
260 E ONTARIO AVE STE 101 CORONA, CA 92879
Location Phone
(951) 371-2411
Location Fax
(951) 284-0177
Mailing Address
260 E ONTARIO AVE STE 101 CORONA, CA 92879
Mailing Phone
(951) 371-2411
Mailing Fax
(951) 284-0177
Medical School Name
OTHER
Graduation Year
2007
Is Sole Proprietor?
No
Enumeration Date
01-03-2012
Last Update Date
05-27-2025
Code Navigator

An internist like Hussein Merza is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

Location Map

Secondary Locations

  • 333 Cottman Ave
    Philadelphia, PA 19111
    (215) 728-6900
  • 1240 S Cedar Crest Blvd Ste 401
    Allentown, PA 18103
    (610) 402-7880

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Internal Medicine Hematology & Oncology

Taxonomy Code
207RH0003X
Type
Allopathic & Osteopathic Physicians
License No.
A168484
License State
CA
Taxonomy Description
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.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1207RH0000XAllopathic & Osteopathic Physicians

Internal Medicine
Hematology

A168484 (CA)

Medicare Participation & PECOS Enrollment Status

Hussein Merza is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Hussein Merza is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 5395902803

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20200924003253

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Established patient office or other outpatient visit, 30-39 minutes

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.

This service was performed 155 times for 74 patients

Follow-up hospital inpatient care per day, typically 35 minutes

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.

This service was performed 31 times for 21 patients

Initial hospital inpatient care per day, typically 70 minutes

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.

This service was performed 28 times for 27 patients

New patient office or other outpatient visit, 60-74 minutes

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

This service was performed 22 times for 22 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $44.85 for a new patient copayment and $26.16 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 92879 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99205

  • Average New Patient Price $179.42
  • Minimum New Patient Price $59.6
  • Maximum New Patient Price $179.42
  • Average New Patient Copayment $44.85
  • Minimum New Patient Copayment $14.9
  • Maximum New Patient Copayment $44.85

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99214

  • Average Established Patient Price $104.64
  • Minimum Established Patient Price $19.37
  • Maximum Established Patient Price $146.42
  • Average Established Patient Copayment $26.16
  • Minimum Established Patient Copayment $4.84
  • Maximum Established Patient Copayment $36.6

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Reviews for HUSSEIN MERZA MD

There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.

NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1235409673, we treat the final digit (3) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 67. The final step is to find the difference between that total and the next multiple of ten (70 - 67 = 3).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
2
Unchanged
Pos 3
3
Doubled → 6
Pos 4
5
Unchanged
Pos 5
4
Doubled → 8
Pos 6
0
Unchanged
Pos 7
9
Doubled → 18 → 1 + 8
Pos 8
6
Unchanged
Pos 9
7
Doubled → 14 → 1 + 4
Check
3
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 3 → 6 4 → 8 9 → 18 → 9 7 → 14 → 5

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 2 + 6 + 5 + 8 + 0 + 1 + 8 + 6 + 1 + 4 + 24 = 67

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 67 is 70. The difference is the calculated check digit.

70 - 67 = 3
This NPI is valid
The calculated check digit is 3, which matches the last digit of 1235409673.

Other Providers at the Same Location


The following 5 providers are registered at the same or a nearby location.

Radiologic Technologist (Radiation Therapy)
260 E ONTARIO AVE STE 101
CORONA, CA 92879
Radiology (Radiation Oncology)
260 E ONTARIO AVE STE 101
CORONA, CA 92879
Physician Assistant
260 E ONTARIO AVE STE 101
CORONA, CA 92879
Internal Medicine (Hematology & Oncology)
260 E ONTARIO AVE STE 101
CORONA, CA 92879
Specialist
260 E ONTARIO AVE STE 101
CORONA, CA 92879

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1235409673, enumerated as an "individual" on January 03, 2012.

The provider is located at 260 E ONTARIO AVE STE 101 CORONA, CA 92879 and the phone number is (951) 371-2411.

Internal Medicine with taxonomy code 207RH0003X and a focus in Hematology & Oncology.