ICD-10-CM > S00-T88 > S30-S39 > S31 > S31.0 > S31.00 > S31.000 S31.000 Unspecified open wound of lower back and pelvis without penetration into retroperitoneum Non-Billable/Non-Specific Applicable To Unspecified open wound of lower back and pelvis NOS Codes S31.000A..., initial encounterS31.000D..., subsequent encounterS31.000S..., sequela