M25.66 - Stiffness of knee, not elsewhere classified M25.6 - Stiffness of joint, not elsewhere classified M25.66 - Stiffness of knee, not elsewhere classified
M25.661 - Stiffness of right knee, not elsewhere classified M25.662 - Stiffness of left knee, not elsewhere classified M25.669 - Stiffness of unspecified knee, not elsewhere classified