ICD-10-CM > S00-T88 > S30-S39 > S31 > S31.0 > S31.02 S31.02 Laceration with foreign body of lower back and pelvis Non-Billable/Non-Specific Codes S31.020Laceration with foreign body of lower back and pelvis without penetration into retroperitoneumS31.020A..., initial encounterS31.020D..., subsequent encounterS31.020S..., sequelaS31.021Laceration with foreign body of lower back and pelvis with penetration into retroperitoneumS31.021A..., initial encounterS31.021D..., subsequent encounterS31.021S..., sequela