ICD-10-CM > K00-K95 > K80-K87 > K80 > K80.0 K80.0 Calculus of gallbladder with acute cholecystitis Non-Billable/Non-Specific Applicable To Any condition listed in K80.2 with acute cholecystitis Use Additional code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2) Codes K80.00Calculus of gallbladder with acute cholecystitis without obstructionK80.01Calculus of gallbladder with acute cholecystitis with obstruction