ICD-10-CM > S00-T88 > S30-S39 > S31 > S31.0 > S31.01 > S31.011 S31.011 Laceration without foreign body of lower back and pelvis with penetration into retroperitoneum Non-Billable/Non-Specific Codes S31.011A..., initial encounterS31.011D..., subsequent encounterS31.011S..., sequela