Ragu Sivarajan, D.O,.
NPI 1902246523 · Internal Medicine Physician · Fontana, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ragu Sivarajan, D.O,. is a Internal Medicine Physician provider in Fontana, CA (NPI 1902246523).
Provider details
- NPI number
- 1902246523
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O,.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 20A14906 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
12 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
214 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 45 | $120 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 37 | $80 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 35 | $75 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 25 | $177 |
| Advance Care Planning, First 30 Minutes99497 | 25 | $77 |
| Initial Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 35 Minutes99305 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 49 | 17 |
| Amlodipine Besylate | 34 | 13 |
| Levothyroxine Sodium | 26 | — |
| Losartan Potassium | 24 | — |
| Metformin Hcl | 23 | — |
| Olmesartan Medoxomil | 19 | — |
| Donepezil Hcl | 18 |
Practice location
Mailing address
Additional practice locations (1)
- 330 E 7th St Fl 2Upland, CA 91786-6740Phone: (909) 330-3939
Registry dates
- Enumerated
- 2013-06-27
- Last updated
- 2025-04-16
- Certified
- 2025-04-16
Frequently asked questions
- What is Ragu Sivarajan's NPI number?
- Ragu Sivarajan's National Provider Identifier (NPI) is 1902246523, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ragu Sivarajan's specialty?
- Ragu Sivarajan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ragu Sivarajan located?
- Ragu Sivarajan's practice location on file with NPPES is 16465 Sierra Lakes Pkwy Ste 245, Fontana, CA 92336-1267.
- What is Ragu Sivarajan's phone number?
- The practice phone number listed in the NPPES registry for Ragu Sivarajan is (909) 330-3939.
- Does Ragu Sivarajan accept Medicare?
- Ragu Sivarajan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ragu Sivarajan's NPI active?
- Yes — Ragu Sivarajan's NPI (1902246523) is active in the NPPES registry as of the last update on 2025-04-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.