| M99.40 | Connective tissue stenosis of neural canal of head region | BILLABLE CODE |
| M99.41 | Connective tissue stenosis of neural canal of cervical region | BILLABLE CODE |
| M99.42 | Connective tissue stenosis of neural canal of thoracic region | BILLABLE CODE |
| M99.43 | Connective tissue stenosis of neural canal of lumbar region | BILLABLE CODE |
| M99.44 | Connective tissue stenosis of neural canal of sacral region | BILLABLE CODE |
| M99.45 | Connective tissue stenosis of neural canal of pelvic region | BILLABLE CODE |
| M99.46 | Connective tissue stenosis of neural canal of lower extremity | BILLABLE CODE |
| M99.47 | Connective tissue stenosis of neural canal of upper extremity | BILLABLE CODE |
| M99.48 | Connective tissue stenosis of neural canal of rib cage | BILLABLE CODE |
| M99.49 | Connective tissue stenosis of neural canal of abdomen and other regions | BILLABLE CODE |
