| S31.000 | Unspecified open wound of lower back and pelvis without penetration into retroperitoneum | NON-BILLABLE CODE |
| S31.000A | Unspecified open wound of lower back and pelvis without penetration into retroperitoneum, initial encounter | BILLABLE CODE |
| S31.000D | Unspecified open wound of lower back and pelvis without penetration into retroperitoneum, subsequent encounter | BILLABLE CODE |
| S31.000S | Unspecified open wound of lower back and pelvis without penetration into retroperitoneum, sequela | BILLABLE CODE |
| S31.001 | Unspecified open wound of lower back and pelvis with penetration into retroperitoneum | NON-BILLABLE CODE |
| S31.001A | Unspecified open wound of lower back and pelvis with penetration into retroperitoneum, initial encounter | BILLABLE CODE |
| S31.001D | Unspecified open wound of lower back and pelvis with penetration into retroperitoneum, subsequent encounter | BILLABLE CODE |
| S31.001S | Unspecified open wound of lower back and pelvis with penetration into retroperitoneum, sequela | BILLABLE CODE |
