Ragu Sivarajan, D.O,.
Internal Medicine Physician · Fontana, CA
Ragu Sivarajan, D.O,. is an internal medicine physician with a practice address in Fontana, California, and NPI 1902246523, issued on Jun 27, 2013. Check the license (California 20A14906, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ragu Sivarajan
- Credential
- D.O,.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A14906 CA
Self-reported in NPPES; status is on the state search - Practice location
- 16465 Sierra Lakes Pkwy Ste 245, Fontana, CA 92336
- Phone
- (909) 330-3939
- Enumerated
- Jun 27, 2013
- Record last updated
- Apr 16, 2025
- Medicare enrollment
- Enrolled (PECOS I20220705001570); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Ragu Sivarajan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A14906Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average internal medicine physician in 2024
568 Medicare Part D claims for 69 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 21 claims were for opioids.
Most prescribed
- Atorvastatin Calcium49 claims
- Amlodipine Besylate34 claims
- Levothyroxine Sodium26 claims
- Losartan Potassium24 claims
- Metformin Hcl23 claims
- Olmesartan Medoxomil19 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 46.9 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).
Bills Medicare through one group practice
- Inpatient Specialists OF California PCSan Bernardino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ragu Sivarajan among 17,696 internal medicine physician records in California
Ragu Sivarajan, D.O,. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 71% of them.
- NPI issued2013 · 71% of these records are older, 26% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2013 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
111 internal medicine physician records list a practice address in Fontana
They are 111 of the 3,012 NPPES records with a practice address in Fontana, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Fontana → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Faramarz Alav, M.D.Fontana, CA 923361508825027
- Syeda AmeenaFontana, CA 923361972998706
- Xu He, D.OFontana, CA 923361568773448
- Maria Relente-Santos, MDFontana, CA 923361437862232
- Brandon Tong, D.O.Fontana, CA 923361508151036
- Danish Abbas, M.D.Fontana, CA 923351104267053
- Ashley Alexander, D.O.Fontana, CA 923351568882298
- Christine Bui, D.OFontana, CA 923351285095752
Common questions
What is Ragu Sivarajan, D.O,.'s NPI number?
Ragu Sivarajan, D.O,.'s National Provider Identifier (NPI) is 1902246523, issued on Jun 27, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Ragu Sivarajan, D.O,. located?
The NPPES record lists a practice address at 16465 Sierra Lakes Pkwy Ste 245, Fontana, CA, 92336. Phone: (909) 330-3939. Providers update this record themselves, so call before visiting.
How can I verify Ragu Sivarajan, D.O,.'s license?
NPPES lists California license number 20A14906, 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 Ragu Sivarajan, D.O,. prescribe under Medicare Part D?
In 2024, Ragu Sivarajan, D.O,. had 568 Medicare Part D claims for 69 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Ragu Sivarajan, D.O,.'s MIPS final score?
The 2023 MIPS final score is 46.9 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.