Dr. Iwan Sing-Djwan Ong, MD
- Medicare services, 2019
- 22
- Medicare patients, 2024
- 13
- Part D claims, 2024
- 1,995
- Hospital affiliations
- 1
- Medical group
- 1
- Practice address
- 10800 Magnolia Avenue, Riverside, CA 92505
- Practice phone
- Call (951) 353-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Ong's professional email, personal email and mobile number
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Dr. Iwan Sing-Djwan Ong is an internist in Riverside, California
Dr. Ong practices at Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
Dr. Ong's NPI, 1265416739, was assigned on November 30, 2005. Dr. Ong graduated from Loma Linda University School Of Medicine in 1989. Dr. Ong's California license number on file is G69360.
- NPI
- 1265416739NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6002984689
- NPI enumeration date
- November 30, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (951) 353-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Iwan Sing-Djwan Ong practices at Riverside Medical Center in Riverside, California
Dr. Ong's primary practice is Riverside Medical Center, at 10800 Magnolia Avenue, Riverside, CA 92505 in Riverside County. The practice phone is (951) 353-2000.
- Riverside Medical Center10800 Magnolia Avenue, Riverside, CA 92505 · Riverside CountyPhone(951) 353-2000
Source: Dmand AI Affiliation Data
Dr. Iwan Sing-Djwan Ong is affiliated with 1 site of care and 1 medical group
Dr. Ong's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Iwan Sing-Djwan Ong's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ong practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Riverside Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Iwan Sing-Djwan Ong is one of 16,751 internists in California
Internal medicine is Dr. Ong's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Ong is board certified in internal medicine by the American Board of Internal Medicine. Dr. Ong has a license on file in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists asthma, chronic diabetes, chronic hypertension, chronic kidney disease and hand joint or tendon inflammation among the conditions Dr. Ong treats.
Internists near Dr. Ong
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Iwan Sing-Djwan Ong billed Medicare for 22 services in 2019
CMS data shows 22 Medicare services from Dr. Ong across 1 procedure code in 2019, all of them office visits, for 13 Medicare patients. Medicare paid $1,220 for them. Every service was in an office.
Dr. Ong's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 222019: 22No change
Dr. Ong compared with the California median for internists, 2019
- Dr. Ong
- California median
- Medicare services
- 22vs 36194% below
- Medicare patients
- 13vs 15191% below
- Part D claims
- 1,591vs 4213.8 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Ong's most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ong and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Iwan Sing-Djwan Ong treated 13 Medicare patients in 2024, average age 71
CMS counts 13 Medicare patients who saw Dr. Ong in 2024. Their average risk score is 1.16, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ong's median patient age at 53, with 66% women.
Dr. Ong's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 53
Patient panel by sex, all payers
- Women66%
- Men34%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Iwan Sing-Djwan Ong wrote 1,995 Medicare Part D claims in 2024
In 2024, Dr. Ong wrote 1,995 Medicare Part D claims for 720 patients. 91% of them were for generic drugs. CMS names the drug for 1,591 of them, across 49 drugs with 11 or more claims each, at $51,402 in total drug cost. In 2023, CMS named 7,474 claims across 106 drugs.
Dr. Ong's Part D claims by kind of drug, 2024
- Generic1,818 claims91%
- Brand-name129 claims6%
- Other48 claims2%
Dr. Ong's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Ong's Part D claims, 2024
- Opioids1%20 of 1,995 claims
- Antibiotics4%79 of 1,995 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 7,4742024: 1,59179%
Drugs named by CMS: 49 in 2024, 106 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Iwan Sing-Djwan Ong takes part in Medicare
Dr. Ong accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Iwan Sing-Djwan Ong has 4 awards and honors on record
Dmand AI lists 4 awards for Dr. Ong, most recently NCQA HSRP in 2014.
Awards and honors for Dr. Ong
- 2014
- NCQA HSRP
- 2012
- NCQA DRP
- 2011
- CMS Stage 1 2012
- Undated
- Bridges to Excellence
Source: Dmand AI Professional Profile Data
Dr. Iwan Sing-Djwan Ong graduated from Loma Linda University School Of Medicine
Dr. Ong graduated from Loma Linda University School Of Medicine in 1989.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Iwan Sing-Djwan Ong accepts plans from 2 insurance carriers
Dr. Ong is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Ong accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Iwan Sing-Djwan Ong's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Iwan Sing-Djwan Ong
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Iwan Sing-Djwan Ong's NPI number?
Dr. Iwan Sing-Djwan Ong's NPI number is 1265416739. It was assigned on November 30, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Iwan Sing-Djwan Ong?
Dr. Iwan Sing-Djwan Ong is an internist in Riverside, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Iwan Sing-Djwan Ong practice?
Dr. Ong practices at 10800 Magnolia Avenue, Riverside, CA 92505. Dr. Ong's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
What is Dr. Iwan Sing-Djwan Ong's office phone number?
The practice phone on file for Dr. Ong is (951) 353-2000.
What is Dr. Iwan Sing-Djwan Ong's medical license number?
Dr. Ong's California license number on file is G69360.
Which hospitals is Dr. Iwan Sing-Djwan Ong affiliated with?
Dr. Ong practices at Riverside Medical Center in Riverside, California.
What medical group is Dr. Iwan Sing-Djwan Ong part of?
Dr. Ong is linked to Southern California Permanente Medical Group.
Does Dr. Iwan Sing-Djwan Ong accept Medicare?
Yes. CMS data shows Dr. Ong billed Medicare for 22 services in 2019, and Dr. Ong accepts Medicare assignment.
How many Medicare patients does Dr. Iwan Sing-Djwan Ong see?
CMS counts 13 Medicare patients who saw Dr. Ong in 2024, with an average age of 71.
Is Dr. Iwan Sing-Djwan Ong board certified?
Yes. Dr. Ong is board certified in internal medicine by the American Board of Internal Medicine.
Show 5 more questionsShow fewer questions
What services does Dr. Iwan Sing-Djwan Ong bill to Medicare?
In 2019, Dr. Ong's most billed Medicare services were office visit, established patient (99214).
Where did Dr. Iwan Sing-Djwan Ong go to medical school?
Dr. Ong graduated from Loma Linda University School Of Medicine in 1989.
What drugs does Dr. Iwan Sing-Djwan Ong prescribe most?
In 2024 Medicare Part D data, Dr. Ong's most prescribed drugs by claims were Atorvastatin Calcium, Omeprazole and Levothyroxine Sodium.
How long has Dr. Iwan Sing-Djwan Ong been practicing?
Dr. Ong graduated from medical school in 1989, 37 years ago.
What insurance does Dr. Iwan Sing-Djwan Ong accept?
Dr. Ong is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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