NPPES file of Aug 9, 2026

Joseph Sze-Tsu Chan, M.D.

Hematology & Oncology Physician · Fontana, CA

Joseph Sze-Tsu Chan, M.D. is a hematology & oncology physician with a practice address in Fontana, California, and NPI 1497796189, issued on Jun 10, 2006. Check the license (California A99860, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1497796189
Name
Joseph Sze-Tsu Chan
Credential
M.D.
Primary taxonomy
Hematology & Oncology Physician 207RH0003X
License number
A99860 CA
Self-reported in NPPES; status is on the state search
Practice location
9985 Sierra Ave, Fontana, CA 92335
Phone
(909) 427-5000
Enumerated
Jun 10, 2006
Record last updated
Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20080507000440); accepts Medicare assignment
Medical or professional school
Vanderbilt University School Of Medicine, 2001
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
Download card Updates feed

8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →

Also registered at 9985 Sierra Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Olga Acosta, MDPediatrics Physician1861404832
  2. Najjia Ahmed, M.D.Pediatrics Physician1699110395
  3. Anje'Le AlstonSports Medicine (Internal Medicine) Physician1356970842
  4. Peyman Andalib, MDStudent in an Organized Health Care Education/Training Program1104028000
  5. Gerald ArafolOccupational Therapist1134315666
  6. Lovie Jay Arguelles, PTPhysical Therapist1457472920

Verify Joseph Sze-Tsu Chan in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A99860    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

2.5 times the Medicare Part D claims of the average hematology & oncology physician in 2024

2,178 Medicare Part D claims for 403 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims. 43 claims were for opioids.

  1. Joseph Chan2,178
  2. Specialty average877

Most prescribed

  1. Abiraterone Acetate566 claims
  2. Prednisone244 claims
  3. Anastrozole239 claims
  4. Xtandi102 claims
  5. Dexamethasone90 claims
  6. Ibrance90 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: $88.97

1 payment: 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.

  1. Joseph Chan$88.97
  2. Specialty average$7,481.41

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

  1. Southern California Permanente Medical GroupFontana, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Joseph Sze-Tsu Chan among 1,583 hematology & oncology physician records in California

Joseph Sze-Tsu Chan, M.D. 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 2006, is newer than 8% of them.

  • NPI issued2006 · 8% of these records are older, 54% newer
  • In a Medicare fileYes · 83% of these records are
  • In the CMS Doctors and Clinicians fileYes · 71% of these records are
  • Graduated2001 · median 2003 among the 1,124 with a school on file
  • Record last updated2021 · 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 Fontana → Hematology & Oncology Physician nationwide →

The 8 hematology & oncology physician records with the nearest ZIP codes

  1. Gerald Battersby, MDFontana, CA 923351467511030
  2. Wanping Hu, MDFontana, CA 923351134296973
  3. Sean Miller, M.D.Fontana, CA 923351396944674
  4. Sunil Patel, MDFontana, CA 923351184791196
  5. Sohail Saeed, MDFontana, CA 923351053469007
  6. Fengyu Shu, MDFontana, CA 923351598832305
  7. Charlie Yang, MDFontana, CA 923351073680823
  8. Siamak Saadat, M.D.Colton, CA 923241992018642

Common questions

What is Joseph Sze-Tsu Chan, M.D.'s NPI number?

Joseph Sze-Tsu Chan, M.D.'s National Provider Identifier (NPI) is 1497796189, issued on Jun 10, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Joseph Sze-Tsu Chan, M.D. located?

The NPPES record lists a practice address at 9985 Sierra Ave, Fontana, CA, 92335. Phone: (909) 427-5000. Providers update this record themselves, so call before visiting.

How can I verify Joseph Sze-Tsu Chan, M.D.'s license?

NPPES lists California license number A99860, 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 Joseph Sze-Tsu Chan, M.D. prescribe under Medicare Part D?

In 2024, Joseph Sze-Tsu Chan, M.D. had 2,178 Medicare Part D claims for 403 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.