Steven Huy Ong, MD
Nephrology Physician · Fairfield, CA
Steven Huy Ong, MD is a nephrology physician with a practice address in Fairfield, California, and NPI 1225006349, issued on Mar 14, 2006. Check the license (California A90786, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Steven Huy Ong
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- A90786 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1411 Oliver RD Ste 250, Fairfield, CA 94534
- Phone
- (707) 426-5407
- Enumerated
- Mar 14, 2006
- Record last updated
- Nov 12, 2024
- Fax
- (707) 426-6376
- Medicare enrollment
- Enrolled (PECOS I20050707000078); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 1411 Oliver RD Ste 250
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jack Luo, MDNephrology Physician1851920854
- Oleg Rubin, MDNephrology Physician1790762763
Verify Steven Huy Ong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A90786Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% fewer Medicare Part D claims than the average nephrology physician in 2024
956 Medicare Part D claims for 158 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Allopurinol206 claims
- Amlodipine Besylate74 claims
- Calcitriol66 claims
- Losartan Potassium61 claims
- Sevelamer Carbonate40 claims
- Furosemide31 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: $683.57
18 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 8,230 providers of this specialty with any payment received $3,091.37 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
- Ong Rubin Shahmir A Medical CorporationFairfield, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Steven Huy Ong among 1,468 nephrology physician records in California
Steven Huy Ong, MD is one of 1,468 nephrology physician records with a practice address in California. 88% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 48% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2000 · median 2001 among the 1,128 with a school on file
- Record last updated2024 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Fairfield → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Jack Luo, MDFairfield, CA 945341851920854
- Oleg Rubin, MDFairfield, CA 945341790762763
- John Baron, D.O.Travis Afb, CA 945351861471591
- Todd Bruno, M.D.Travis Afb, CA 945351407059702
- Madison Calder, MDFairfield, CA 945351336773571
- Fedoua Er Rbii, MDTravis Afb, CA 945351871150680
- Huyen Nguyen, M.D.Travis Afb, CA 945351528502895
- Steven Tolkan, MDFairfield, CA 945331871554766
Common questions
What is Steven Huy Ong, MD's NPI number?
Steven Huy Ong, MD's National Provider Identifier (NPI) is 1225006349, issued on Mar 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Steven Huy Ong, MD located?
The NPPES record lists a practice address at 1411 Oliver RD Ste 250, Fairfield, CA, 94534. Phone: (707) 426-5407. Providers update this record themselves, so call before visiting.
How can I verify Steven Huy Ong, MD's license?
NPPES lists California license number A90786, 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 Steven Huy Ong, MD prescribe under Medicare Part D?
In 2024, Steven Huy Ong, MD had 956 Medicare Part D claims for 158 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.
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.