M40.14 identifies kyphosis of the thoracic spine that is secondary to an underlying condition — not postural in origin and not congenital, postprocedural, or part of a kyphoscoliosis pattern.

Documentation tips

What should appear in the chart to support M40.14.

Source · Editorial brief grounded in 4 cited references ↓

• Identify the underlying causative condition by name (e.g., osteoporosis, neuromuscular disease, prior infection) — this is required by the 'Code First' instruction and determines sequencing.
• Record Cobb angle from standing AP and lateral spine radiographs; note the apex vertebral level and whether the curve is rigid or flexible.
• Specify thoracic region explicitly in the assessment — if the curve extends to the thoracolumbar junction (T12–L1), use M40.15 instead.
• Document any neurological findings, functional deficits, or pain referral pattern that support medical necessity for imaging, orthosis, or surgical consultation.
• When osteoporosis is the driver, code the osteoporosis with current or historical vertebral fracture before M40.14 to satisfy the sequencing rule.

Related CPT procedures

Procedure codes commonly billed with M40.14. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

Common coding pitfalls

The recurring mistakes coders make with M40.14 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

• Sequencing M40.14 first when a 'Code First underlying disease' instruction is present — the causative diagnosis must lead the claim.
• Using M40.14 for congenital thoracic kyphosis; that maps to Q76.4, which is an Excludes1 condition at the M40 category level.
• Applying M40.14 when postprocedural kyphosis (M96.-) is the correct type — surgical or radiation-induced deformity belongs in the M96 category, not M40.
• Selecting M40.14 when kyphosis co-exists with scoliosis; combined curves code to kyphoscoliosis (M41.-), another Excludes1 exclusion.
• Using M40.04 (postural kyphosis, thoracic) when the chart clearly documents a structural secondary cause — postural and secondary kyphosis have distinct etiologies and different treatment implications.

Clinical context

Source · Editorial summary grounded in 4 cited references ↓

Sibling codes

Other billable codes under M40.1 (laterality / anatomic variants).