NPPES file of Aug 9, 2026

Jiyon Jane Choi, MD

Hematology & Oncology Physician · Antioch, CA

Jiyon Jane Choi, MD is a hematology & oncology physician with a practice address in Antioch, California, and NPI 1144437567, issued on May 16, 2007. Check the license (California A106992, 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
1144437567
Name
Jiyon Jane Choi
Credential
MD
Primary taxonomy
Hematology & Oncology Physician 207RH0003X
License number
A106992 CA
Self-reported in NPPES; status is on the state search
Practice location
4721 Dallas Ranch RD, Antioch, CA 94531
Phone
(925) 778-0679
Enumerated
May 16, 2007
Record last updated
Apr 18, 2013 (not updated in 13 years: call before relying on the address or phone)
Fax
(925) 778-3567
Medicare enrollment
Enrolled (PECOS I20100115000559); accepts Medicare assignment
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.
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8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →

Also registered at 4721 Dallas Ranch RD

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

  1. Zahora Ally, MDRadiation Oncology Physician1306839915
  2. Joseph Beck, M.D.Radiation Oncology Physician1740206085
  3. Susan Bucker, LCSWClinical Social Worker1588935050
  4. Mariam Korah, MDRadiation Oncology Physician1083891543
  5. Tuan Pham, PHARMDPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1588369342
  6. Prasad Pillai, MDHematology & Oncology Physician1023174380

Verify Jiyon Jane Choi in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A106992    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.

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57% more Medicare Part D claims than the average hematology & oncology physician in 2024

1,379 Medicare Part D claims for 239 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims. 78 claims were for opioids.

  1. Jiyon Choi1,379
  2. Specialty average877

Most prescribed

  1. Letrozole107 claims
  2. Anastrozole89 claims
  3. Eliquis88 claims
  4. Hydrocodone-Acetaminophen52 claims
  5. Ibrance51 claims
  6. Ondansetron Hcl50 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: $3,609.09

159 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. 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. Jiyon Choi$3,609.09
  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. Epic CareAntioch, CA

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

Jiyon Jane Choi among 1,583 hematology & oncology physician records in California

Jiyon Jane Choi, MD 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 2007, is newer than 46% of them.

  • NPI issued2007 · 46% of these records are older, 40% newer
  • In a Medicare fileYes · 83% of these records are
  • In the CMS Doctors and Clinicians fileYes · 71% of these records are
  • Graduated2003 · median 2003 among the 1,124 with a school on file
  • Record last updated2013 · 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 Antioch → Hematology & Oncology Physician nationwide →

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

  1. John Ganey, MDAntioch, CA 945311215935713
  2. Bimal Patel, M.D.Antioch, CA 945311841298221
  3. Prasad Pillai, MDAntioch, CA 945311023174380
  4. Srikanth Reddy, M.D.Antioch, CA 945311649440744
  5. Margaret (meg) Seaver, MDAntioch, CA 945311386753127
  6. Sukhwant Singh, MDAntioch, CA 945311285839209
  7. Wilson Tong, M.D.Antioch, CA 945311427261437
  8. Jonathan Lopez, MDFairfield, CA 945331881682714

Common questions

What is Jiyon Jane Choi, MD's NPI number?

Jiyon Jane Choi, MD's National Provider Identifier (NPI) is 1144437567, issued on May 16, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Jiyon Jane Choi, MD located?

The NPPES record lists a practice address at 4721 Dallas Ranch RD, Antioch, CA, 94531. Phone: (925) 778-0679. Providers update this record themselves, so call before visiting.

How can I verify Jiyon Jane Choi, MD's license?

NPPES lists California license number A106992, 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 Jiyon Jane Choi, MD prescribe under Medicare Part D?

In 2024, Jiyon Jane Choi, MD had 1,379 Medicare Part D claims for 239 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.