M40: Kyphosis and lordosis
Codes under M40 (Kyphosis and lordosis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| M40.0 | Postural kyphosis | — |
| M40.0 | Postural kyphosis | — |
| M40.00 | Postural kyphosis, site unspecified | ✓ |
| M40.00 | Postural kyphosis, site unspecified | ✓ |
| M40.1 | Other secondary kyphosis | — |
| M40.1 | Other secondary kyphosis | — |
| M40.2 | Other and unspecified kyphosis | — |
| M40.2 | Other and unspecified kyphosis | — |
| M40.03 | Postural kyphosis, cervicothoracic region | ✓ |
| M40.03 | Postural kyphosis, cervicothoracic region | ✓ |
| M40.3 | Flatback syndrome | — |
| M40.3 | Flatback syndrome | — |
| M40.04 | Postural kyphosis, thoracic region | ✓ |
| M40.04 | Postural kyphosis, thoracic region | ✓ |
| M40.4 | Postural lordosis | — |
| M40.4 | Postural lordosis | — |
| M40.05 | Postural kyphosis, thoracolumbar region | ✓ |
| M40.05 | Postural kyphosis, thoracolumbar region | ✓ |
| M40.5 | Lordosis, unspecified | — |
| M40.5 | Lordosis, unspecified | — |
| M40.10 | Other secondary kyphosis, site unspecified | ✓ |
| M40.10 | Other secondary kyphosis, site unspecified | ✓ |
| M40.12 | Other secondary kyphosis, cervical region | ✓ |
| M40.12 | Other secondary kyphosis, cervical region | ✓ |
| M40.13 | Other secondary kyphosis, cervicothoracic region | ✓ |
| M40.13 | Other secondary kyphosis, cervicothoracic region | ✓ |
| M40.14 | Other secondary kyphosis, thoracic region | ✓ |
| M40.14 | Other secondary kyphosis, thoracic region | ✓ |
| M40.15 | Other secondary kyphosis, thoracolumbar region | ✓ |
| M40.15 | Other secondary kyphosis, thoracolumbar region | ✓ |
| M40.20 | Unspecified kyphosis | — |
| M40.20 | Unspecified kyphosis | — |
| M40.29 | Other kyphosis | — |
| M40.29 | Other kyphosis | — |
| M40.30 | Flatback syndrome, site unspecified | ✓ |
| M40.30 | Flatback syndrome, site unspecified | ✓ |
| M40.35 | Flatback syndrome, thoracolumbar region | ✓ |
| M40.35 | Flatback syndrome, thoracolumbar region | ✓ |
| M40.36 | Flatback syndrome, lumbar region | ✓ |
| M40.36 | Flatback syndrome, lumbar region | ✓ |
| M40.37 | Flatback syndrome, lumbosacral region | ✓ |
| M40.37 | Flatback syndrome, lumbosacral region | ✓ |
| M40.40 | Postural lordosis, site unspecified | ✓ |
| M40.40 | Postural lordosis, site unspecified | ✓ |
| M40.45 | Postural lordosis, thoracolumbar region | ✓ |
| M40.45 | Postural lordosis, thoracolumbar region | ✓ |
| M40.46 | Postural lordosis, lumbar region | ✓ |
| M40.46 | Postural lordosis, lumbar region | ✓ |
| M40.47 | Postural lordosis, lumbosacral region | ✓ |
| M40.47 | Postural lordosis, lumbosacral region | ✓ |
| M40.50 | Lordosis, unspecified, site unspecified | ✓ |
| M40.50 | Lordosis, unspecified, site unspecified | ✓ |
| M40.55 | Lordosis, unspecified, thoracolumbar region | ✓ |
| M40.55 | Lordosis, unspecified, thoracolumbar region | ✓ |
| M40.56 | Lordosis, unspecified, lumbar region | ✓ |
| M40.56 | Lordosis, unspecified, lumbar region | ✓ |
| M40.57 | Lordosis, unspecified, lumbosacral region | ✓ |
| M40.57 | Lordosis, unspecified, lumbosacral region | ✓ |
| M40.202 | Unspecified kyphosis, cervical region | ✓ |
| M40.202 | Unspecified kyphosis, cervical region | ✓ |
| M40.203 | Unspecified kyphosis, cervicothoracic region | ✓ |
| M40.203 | Unspecified kyphosis, cervicothoracic region | ✓ |
| M40.204 | Unspecified kyphosis, thoracic region | ✓ |
| M40.204 | Unspecified kyphosis, thoracic region | ✓ |
| M40.205 | Unspecified kyphosis, thoracolumbar region | ✓ |
| M40.205 | Unspecified kyphosis, thoracolumbar region | ✓ |
| M40.209 | Unspecified kyphosis, site unspecified | ✓ |
| M40.209 | Unspecified kyphosis, site unspecified | ✓ |
| M40.292 | Other kyphosis, cervical region | ✓ |
| M40.292 | Other kyphosis, cervical region | ✓ |
| M40.293 | Other kyphosis, cervicothoracic region | ✓ |
| M40.293 | Other kyphosis, cervicothoracic region | ✓ |
| M40.294 | Other kyphosis, thoracic region | ✓ |
| M40.294 | Other kyphosis, thoracic region | ✓ |
| M40.295 | Other kyphosis, thoracolumbar region | ✓ |
| M40.295 | Other kyphosis, thoracolumbar region | ✓ |
| M40.299 | Other kyphosis, site unspecified | ✓ |
| M40.299 | Other kyphosis, site unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code M40?
M40 is an ICD-10-CM category covering Kyphosis and lordosis. It contains 78 more specific diagnosis codes, 62 of which are billable.
Is M40 a billable code?
No — M40 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example M40.0 — Postural kyphosis). 62 of the 78 codes under M40 are billable.
What codes fall under M40?
M40 includes M40.0, M40.0, M40.00, M40.00, M40.1, plus 73 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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