George Hajjar, MD
Hematology & Oncology Physician · Santa Clarita, CA
George Hajjar, MD is a hematology & oncology physician with a practice address in Santa Clarita, California, and NPI 1619978715, issued on Aug 10, 2005. Check the license (California C52459, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- George Hajjar
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- C52459 CA
Self-reported in NPPES; status is on the state search - Practice location
- 23823 Valencia Blvd Ste 250, Santa Clarita, CA 91355
- Phone
- (661) 799-1999
- Enumerated
- Aug 10, 2005
- Entity
- Type 1 · individual
Also registered at 23823 Valencia Blvd Ste 250
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maria Creselda De Leon, MDGynecologic Oncology Physician1073773073
- Thomas Joseph, MDHematology (Internal Medicine) Physician1861430092
- Vincent Louie Mendiola, M.D.Hematology & Oncology Physician1922534866
- Kristina Wittig, MDUrology Physician1215995998
Verify George Hajjar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C52459Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
11% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
789 Medicare Part D claims for 174 beneficiaries, against an average of 885 among the 8,428 providers of this specialty who prescribed in Part D. Brand-name drugs were 26% of claims. 37 claims were for opioids.
Most prescribed
- Ondansetron Hcl79 claims
- Anastrozole54 claims
- Eliquis44 claims
- Dexamethasone37 claims
- Famotidine37 claims
- Hydroxyurea30 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.
The practice group's Medicare quality score for 2023: 99.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $3,286.57
10 payments, mostly consulting fee; the largest payer was AstraZeneca Pharmaceuticals LP. The 6,678 providers of this specialty with any payment received $7,643.36 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.
One hospital or facility affiliation
- City OF Hope Medical FoundationSimi Valley, CA
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Hematology & Oncology Physician providers in California
There are 1,306 hematology & oncology physician records in California.
Other hematology & oncology physician records in California
- Mark Abate, M.D.Santa Barbara, CA1588778674
- Iman Abdalla, MDLos Angeles, CA1730248311
- Nihal Abdulla, MDLos Alamitos, CA1750585345
- Oyewale Abidoye, M.D.La Jolla, CA1790841815
- Mohamad Adada, M.D., PHDRoseville, CA1528590734
- Jesse Adams, MDSacramento, CA1851479554
- Thompson Adams, MDSanta Monica, CA1407880891
- Camille Adeimy, MDUpland, CA1477785160
- David Adkins, MDModesto, CA1104883644
- Kent Adler, M.D.San Mateo, CA1013074632
Common questions
What is George Hajjar, MD's NPI number?
George Hajjar, MD's National Provider Identifier (NPI) is 1619978715, issued on Aug 10, 2005. An NPI identifies a provider in billing; it is not a license.
Where is George Hajjar, MD located?
The NPPES record lists a practice address at 23823 Valencia Blvd Ste 250, Santa Clarita, CA, 91355. Phone: (661) 799-1999. Providers update this record themselves, so call before visiting.
How can I verify George Hajjar, MD's license?
NPPES lists California license number C52459, 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 George Hajjar, MD prescribe under Medicare Part D?
In 2024, George Hajjar, MD had 789 Medicare Part D claims for 174 beneficiaries; the average among hematology & oncology physician prescribers was 885. Part D covers Medicare prescriptions only.
What is George Hajjar, MD's Medicare quality score?
The 2023 MIPS final score is 99.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.