Dr. Ritesh Kauntia, the best nephrologist in Kolkata, has 20+ years of experience in the field of Nephrology . Expert care you can trust. 8777650604.Dr. Kauntia is capable of doing kidney biopsies, and central catheters for hemodialysis both non-cuffed and cuffed (permcath) under ultrasound guidance. This helps in minimizing complications and causing minimal pain.