DR. RAGU SIVARAJAN D.O,.
NPI 1902246523
Internal Medicine in Fontana, CA
About Dr. Ragu Sivarajan D.o,. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. RAGU SIVARAJAN D.O,. (NPI 1902246523) is an individual internal medicine provider in Fontana, California, licensed in California (20A14906) and active in the NPI registry since June 2013. He is enrolled in Medicare PECOS, maintains a secondary practice location in Upland, and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Ragu Sivarajan D.o,. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
5Medicare enrollment records show Ragu Sivarajan reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Ontario, CA 91764
- Reassigned Medicare billing, California enrollment
- 27 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 clinicians in this Medicare group
Montclair, CA 91763
- Reassigned Medicare billing, California enrollment
- 11 clinicians in this Medicare group
Apple Valley, CA 92307
- Reassigned Medicare billing, California enrollment
- 914 clinicians in this Medicare group
San Francisco, CA 94111
- Reassigned Medicare billing, California enrollment
- 407 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 8
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92336 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Ragu Sivarajan's NPI number?
The NPI number for Ragu Sivarajan is 1902246523. It was assigned to this individual provider in the NPPES registry on June 27, 2013.
Where is Ragu Sivarajan located?
Ragu Sivarajan practices at 16465 Sierra Lakes Pkwy Ste 245, Fontana, CA 92336. The listed phone number is (909) 330-3939.
What is Ragu Sivarajan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Ragu Sivarajan enrolled in Medicare?
Yes. Ragu Sivarajan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Ragu Sivarajan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ragu Sivarajan reassigns Medicare benefits to 5 organizations: Wound Healing Care Specialists, Inc. (Ontario, CA), Inpatient Specialists Of California, PC (San Bernardino, CA), Golden State Medical Group (Montclair, CA), Hospitalist Medicine Physicians Of California, Inc (Apple Valley, CA) and Signify Health Medical Associates Of California, PC (San Francisco, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ragu Sivarajan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Ragu Sivarajan was last updated on April 16, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Ragu Sivarajan, D.O,. · NPI 1902246523
Internal Medicine physician in Fontana, California. Individual provider, active in the CMS NPPES registry since June 27, 2013.
## Identity
- **NPI:** 1902246523 (Entity type: Individual)
- **Enumerated:** June 27, 2013
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 20A14906 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 16465 SIERRA LAKES PKWY STE 245, Fontana, CA 92336-1267
- **Phone:** (909) 330-3939
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Wound Healing Care Specialists, Inc. (NPI 1306317961, Ontario, CA); Inpatient Specialists Of California, PC (NPI 1952792475, San Bernardino, CA); Golden State Medical Group (NPI 1255958476, Montclair, CA); Hospitalist Medicine Physicians Of California, Inc (NPI 1184663965, Apple Valley, CA); Signify Health Medical Associates Of California, PC (NPI 1124685169, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** April 16, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1902246523) · Data from the CMS NPPES public registry.