| L98.421 | Non-pressure chronic ulcer of back limited to breakdown of skin | BILLABLE CODE |
| L98.422 | Non-pressure chronic ulcer of back with fat layer exposed | BILLABLE CODE |
| L98.423 | Non-pressure chronic ulcer of back with necrosis of muscle | BILLABLE CODE |
| L98.424 | Non-pressure chronic ulcer of back with necrosis of bone | BILLABLE CODE |
| L98.425 | Non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis | BILLABLE CODE |
| L98.426 | Non-pressure chronic ulcer of back with bone involvement without evidence of necrosis | BILLABLE CODE |
| L98.428 | Non-pressure chronic ulcer of back with other specified severity | BILLABLE CODE |
| L98.429 | Non-pressure chronic ulcer of back with unspecified severity | BILLABLE CODE |
