Gumla Simdega Central Co Operative Bank branches in Patna: Get the list of Gumla Simdega Central Co Operative Bank MICR codes in Patna which are made available by Branch. Patna MICR code is a character-recognition technology used mainly by the banking industry to ease the processing and clearance of cheques and other documents. Patna MICR code has 9 digits first three digits are Patna City Code, second three digits are Patna bank code and last three are Patna branch code.