Weber Chen, M.D.
Hematology & Oncology Physician · Pasadena, CA
Weber Chen, M.D. is a hematology & oncology physician with a practice address in Pasadena, California, and NPI 1679504393, issued on Jul 5, 2006. Check the license (California A85444, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Weber Chen
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A85444 CA
Self-reported in NPPES; status is on the state search - Practice location
- 50 Alessandro PL Ste 310, Pasadena, CA 91105
- Phone
- (626) 288-0008
- Enumerated
- Jul 5, 2006
- Record last updated
- Jul 21, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (866) 741-4630
- Medicaid ID
- 00A854440 CA
- Medicare enrollment
- Enrolled (PECOS I20040723001092); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 50 Alessandro PL Ste 310
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ronald Tang, DOHematology & Oncology Physician1609022383
- Xiaoxiao Wang, FNP-CFamily Nurse Practitioner1346089141
Verify Weber Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A85444Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average hematology & oncology physician in 2024
2,580 Medicare Part D claims for 376 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 53% of claims. 71 claims were for opioids.
Most prescribed
- Procrit147 claims
- Anastrozole138 claims
- Xtandi127 claims
- Tagrisso124 claims
- Zarxio113 claims
- Revlimid95 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 MIPS final score for 2023 (Medicare payment program): 100 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: $5,240.30
215 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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
- Los Angeles Hematology-Oncology Medical GroupPasadena, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 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
- Haifaa Abdulhaq, MDFresno, CA1508024647
- Nihal Abdulla, MDLos Alamitos, CA1750585345
- Mehrad Abedi, M.D.Sacramento, CA1467459222
- Oyewale Abidoye, M.D.La Jolla, CA1790841815
- Mohammed Abu Zaanona, MDSanta Barbara, CA1922591197
- Mohamad Adada, M.D., PHDRoseville, CA1528590734
- Jesse Adams, MDSacramento, CA1851479554
- Thompson Adams, MDSanta Monica, CA1407880891
Common questions
What is Weber Chen, M.D.'s NPI number?
Weber Chen, M.D.'s National Provider Identifier (NPI) is 1679504393, issued on Jul 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Weber Chen, M.D. located?
The NPPES record lists a practice address at 50 Alessandro PL Ste 310, Pasadena, CA, 91105. Phone: (626) 288-0008. Providers update this record themselves, so call before visiting.
How can I verify Weber Chen, M.D.'s license?
NPPES lists California license number A85444, 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 Weber Chen, M.D. prescribe under Medicare Part D?
In 2024, Weber Chen, M.D. had 2,580 Medicare Part D claims for 376 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Weber Chen, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 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), 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.