Quick answers
- Does Ruth M. Karunananthan accept Medicare assignment?
- Yes. Medicare's clinician data says Ruth M. Karunananthan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Ruth M. Karunananthan see?
- In 2024, CMS data shows 79 Original Medicare patients and 374 services for Ruth M. Karunananthan. This counts Original Medicare only and measures volume, not quality.
- What is Ruth M. Karunananthan's NPI number?
- 1922057256. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Ruth M. Karunananthan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 79 |
|---|---|
| Services billed to Medicare | 374 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)157 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)136 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)34 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes39%
- Arthritis33%
- Chronic kidney disease28%
- Heart failure15%
Practice locations
Addresses where Ruth M. Karunananthan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1500 W W Covina PkwyWest Covina, CA 91790 (626) 430‑9991
Group practices
Medicare enrollment lists Ruth M. Karunananthan as a member of this group (CMS data updated October 2, 2026).
- Lakeside Medical Organization a Medical Group Inc64 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in West Covina
Clinicians with the same Medicare primary specialty in West Covina, CA — not a recommendation.
Other clinicians in Lakeside Medical Organization a Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1993 (33 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922057256 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians