| M40 | Kyphosis and lordosis | NON-BILLABLE CODE |
| M40.0 | Postural kyphosis | NON-BILLABLE CODE |
| M40.00 | Postural kyphosis, site unspecified | BILLABLE CODE |
| M40.03 | Postural kyphosis, cervicothoracic region | BILLABLE CODE |
| M40.04 | Postural kyphosis, thoracic region | BILLABLE CODE |
| M40.05 | Postural kyphosis, thoracolumbar region | BILLABLE CODE |
| M40.1 | Other secondary kyphosis | NON-BILLABLE CODE |
| M40.10 | Other secondary kyphosis, site unspecified | BILLABLE CODE |
| M40.12 | Other secondary kyphosis, cervical region | BILLABLE CODE |
| M40.13 | Other secondary kyphosis, cervicothoracic region | BILLABLE CODE |
| M40.14 | Other secondary kyphosis, thoracic region | BILLABLE CODE |
| M40.15 | Other secondary kyphosis, thoracolumbar region | BILLABLE CODE |
| M40.2 | Other and unspecified kyphosis | NON-BILLABLE CODE |
| M40.20 | Unspecified kyphosis | NON-BILLABLE CODE |
| M40.202 | Unspecified kyphosis, cervical region | BILLABLE CODE |
| M40.203 | Unspecified kyphosis, cervicothoracic region | BILLABLE CODE |
| M40.204 | Unspecified kyphosis, thoracic region | BILLABLE CODE |
| M40.205 | Unspecified kyphosis, thoracolumbar region | BILLABLE CODE |
| M40.209 | Unspecified kyphosis, site unspecified | BILLABLE CODE |
| M40.29 | Other kyphosis | NON-BILLABLE CODE |
| M40.292 | Other kyphosis, cervical region | BILLABLE CODE |
| M40.293 | Other kyphosis, cervicothoracic region | BILLABLE CODE |
| M40.294 | Other kyphosis, thoracic region | BILLABLE CODE |
| M40.295 | Other kyphosis, thoracolumbar region | BILLABLE CODE |
| M40.299 | Other kyphosis, site unspecified | BILLABLE CODE |
| M40.3 | Flatback syndrome | NON-BILLABLE CODE |
| M40.30 | Flatback syndrome, site unspecified | BILLABLE CODE |
| M40.35 | Flatback syndrome, thoracolumbar region | BILLABLE CODE |
| M40.36 | Flatback syndrome, lumbar region | BILLABLE CODE |
| M40.37 | Flatback syndrome, lumbosacral region | BILLABLE CODE |
| M40.4 | Postural lordosis | NON-BILLABLE CODE |
| M40.40 | Postural lordosis, site unspecified | BILLABLE CODE |
| M40.45 | Postural lordosis, thoracolumbar region | BILLABLE CODE |
| M40.46 | Postural lordosis, lumbar region | BILLABLE CODE |
| M40.47 | Postural lordosis, lumbosacral region | BILLABLE CODE |
| M40.5 | Lordosis, unspecified | NON-BILLABLE CODE |
| M40.50 | Lordosis, unspecified, site unspecified | BILLABLE CODE |
| M40.55 | Lordosis, unspecified, thoracolumbar region | BILLABLE CODE |
| M40.56 | Lordosis, unspecified, lumbar region | BILLABLE CODE |
