Ruth Manjula Karunananthan, M.D.
Internal Medicine Physician · West Covina, CA
Ruth Manjula Karunananthan, M.D. is an internal medicine physician with a practice address in West Covina, California, and NPI 1922057256, issued on May 5, 2006. Check the license (California A64387, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ruth Manjula Karunananthan
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A64387 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1500 W West Covina Pkwy, West Covina, CA 91790
- Phone
- (626) 263-7010
- Enumerated
- May 5, 2006
- Record last updated
- Nov 13, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (626) 960-3634
- Medicaid ID
- 00A368060 CA
- Medicare enrollment
- Enrolled (PECOS I20100521000599); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 1500 W West Covina Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Suneetha Ali, M.D.Obstetrics & Gynecology Physician1679523682
- Kamel Azmy, M.D.Pediatrics Physician1679522270
- Darrell Carter, P.A.Physician Assistant1407047756
- Justine Cruz, NP-CNurse Practitioner1932817897
- Van Duong, M.D.Family Medicine Physician1497705289
- Clara Edobor, NPNurse Practitioner1477561496
Verify Ruth Manjula Karunananthan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A64387Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,825 Medicare Part D claims for 499 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 19 claims were for opioids.
Most prescribed
- Atorvastatin Calcium785 claims
- Amlodipine Besylate535 claims
- Levothyroxine Sodium242 claims
- Olmesartan Medoxomil237 claims
- Lisinopril206 claims
- Metformin Hcl198 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.
Industry payments in 2024: $132.83
6 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Lakeside Medical Organization A Medical Group IncWest Covina, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
23 internal medicine physician records list a practice address in West Covina
They are 23 of the 2,450 NPPES records with a practice address in West Covina, and 17,696 internal medicine physician records in California.
All 23 in West Covina → All 17,696 in California → Every provider in West Covina →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Ruth Manjula Karunananthan, M.D.'s NPI number?
Ruth Manjula Karunananthan, M.D.'s National Provider Identifier (NPI) is 1922057256, issued on May 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ruth Manjula Karunananthan, M.D. located?
The NPPES record lists a practice address at 1500 W West Covina Pkwy, West Covina, CA, 91790. Phone: (626) 263-7010. Providers update this record themselves, so call before visiting.
How can I verify Ruth Manjula Karunananthan, M.D.'s license?
NPPES lists California license number A64387, 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 Ruth Manjula Karunananthan, M.D. prescribe under Medicare Part D?
In 2024, Ruth Manjula Karunananthan, M.D. had 6,825 Medicare Part D claims for 499 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.