Dr. Ranil S. Gajanayaka, MD

Dr. Gajanayaka practices at Dallas Nephrology Associates in Irving, Texas.

Dr. Gajanayaka's NPI, 1841452380, was assigned on June 26, 2008. Dr. Gajanayaka graduated from University of Colombo Faculty of Medicine in 2003. Dr. Gajanayaka holds Texas license Q4580.

Dr. Gajanayaka's primary practice is Dallas Nephrology Associates, at 2005 W Park Dr, Irving, TX 75061 in Dallas County. The practice phone is (214) 358-2300.

Dr. Gajanayaka's primary practice is Dallas Nephrology Associates in Irving, Texas. Dr. Gajanayaka is also affiliated with Medical City Las Colinas Hospital. The medical group on file is Dallas Nephrology Associates. Dmand AI also links Dr. Gajanayaka to 4 more hospitals, 4 medical groups, 2 dialysis centers and 1 group practice or clinic, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gajanayaka practices, 8 sites in all. Vendor and product names are available with a free account.

Nephrology is Dr. Gajanayaka's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Gajanayaka is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Gajanayaka's licenses on file in 6 states: Texas, North Dakota, Minnesota, Oklahoma, Arizona and Connecticut.

Dmand AI lists acute kidney failure, chronic kidney disease, electrolyte disorders, fluid and electrolyte imbalances, gout, hypercalcemia, kidney cysts and kidney disease among the conditions Dr. Gajanayaka treats.

CMS data shows 2,450 Medicare services from Dr. Gajanayaka across 13 procedure codes in 2024, for 541 Medicare patients. Medicare paid $207,819 for them.

CMS counts 541 Medicare patients who saw Dr. Gajanayaka in 2024. The largest group is 75 to 84, with 214 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 10% are also on Medicaid. Their average risk score is 2.91, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Gajanayaka's median patient age at 71, with 44% women.

In 2024, Dr. Gajanayaka wrote 1,590 Medicare Part D claims for 268 patients. 86% of them were for generic drugs. CMS names the drug for 1,268 of them, across 38 drugs with 11 or more claims each, at $235,652 in total drug cost. In 2023, CMS named 1,335 claims across 40 drugs.

Dr. Gajanayaka accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Gajanayaka as offering telehealth.

Dmand AI links 2 papers to Dr. Gajanayaka, published from 2010 to 2015. Dr. Gajanayaka's most frequent co-authors are Steven G. Coca, DO, MS, Erol M. Kosar, MD and Sachini Ranasinghe.

CMS Open Payments shows 83 general payments to Dr. Gajanayaka from 20 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. AstraZeneca Pharmaceuticals LP paid the most, $339.

Dr. Gajanayaka graduated from University of Colombo Faculty of Medicine in 2003.

Dr. Gajanayaka is in network with 24 carriers, including Aetna, Elevance and Excellus BlueCross BlueShield. PPO plans come from the most carriers, 15. Check the plan with the practice before a visit.