Delphine W. Ong, M.D.
Medical Oncology Physician · Sacramento, CA
Delphine W. Ong, M.D. is a medical oncology physician with a practice address in Sacramento, California, and NPI 1023034022, issued on Jul 14, 2006. Check the license (California A49552, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Delphine W. Ong
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- A49552 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3301 C Street, Sacramento, CA 95816
- Phone
- (916) 733-5300
- Enumerated
- Jul 14, 2006
- Record last updated
- Jan 9, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (916) 733-5920
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 447 in California → Look up another NPI →
Also registered at 3301 C Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Baran Ho, M.D.Dermatology Physician1891139010
- Zarir Karanjawala, M.D., PH.D.Specialist1558415000
- Derek Marsee, MD, PHDAnatomic Pathology & Clinical Pathology Physician1952592743
- Danielle Tartar, MD,PHDDermatology Physician1063850840
- Ellen Wiegner, MDRadiation Oncology Physician1831379122
Verify Delphine W. Ong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A49552Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 34.6 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).
Delphine W. Ong among 447 medical oncology physician records in California
Delphine W. Ong, M.D. is one of 447 medical oncology physician records with a practice address in California. 82% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2014 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in California
There are 447 medical oncology physician records in California.
All 447 in California → Every provider in Sacramento → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- John Fisher, M.D.Sacramento, CA 958161790704286
- Robert Quadro, M.D.Sacramento, CA 958161730293374
- Samer Shihabi, M.D.Sacramento, CA 958161730110768
- Nora Wu, M.D.Sacramento, CA 958161487754461
- Janai Carr-Ascher, MD, PHDSacramento, CA 958171538401195
- Ryan Leibrandt, M.D.Sacramento, CA 958171801327044
- Neil Patel, M.D.Sacramento, CA 958171992817613
- Randeep Sangha, M.D.Sacramento, CA 958171952582199
Common questions
What is Delphine W. Ong, M.D.'s NPI number?
Delphine W. Ong, M.D.'s National Provider Identifier (NPI) is 1023034022, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Delphine W. Ong, M.D. located?
The NPPES record lists a practice address at 3301 C Street, Sacramento, CA, 95816. Phone: (916) 733-5300. Providers update this record themselves, so call before visiting.
How can I verify Delphine W. Ong, M.D.'s license?
NPPES lists California license number A49552, 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.
What is Delphine W. Ong, M.D.'s MIPS final score?
The 2023 MIPS final score is 34.6 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.