Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Ragu Sivarajan, DO

Individual provider Internal Medicine Physician · NPI 1902246523

Dr. Ragu Sivarajan, DO is an Internal Medicine in Fontana, California. Qualified in 2013, 13 years ago. Practices as a sole proprietor, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
13
Licensed in
CA
In the registry since
2013
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

16465 Sierra Lakes Pkwy Ste 245
Fontana, CA 92336-1267
Phone: (909) 330-3939
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 330 E 7th St Fl 2, Upland, CA 91786-6740 — (909) 330-3939

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 20A14906 (CA)

Record details

NPI number1902246523
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedJune 27, 2013
Last updated in NPPESApril 16, 2025
Certification dateApril 16, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2013 (13 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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