M40.204 Unspecified kyphosis, thoracic region

Billable ICD-10-CM code, FY2026.

Applies from M40 Kyphosis and lordosis

Excludes1 (never code together)

• congenital kyphosis and lordosis (Q76.4)
• kyphoscoliosis (M41.-)
• postprocedural kyphosis and lordosis (M96.-)

Code first

• underlying disease

MS-DRG index

Defines the logic of DRG(s) 456-458 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 737.10 Kyphosis (acquired) (postural) (approximate)

Code annotations containing back-references to M40.204

Back-references to M40

• Type 2 Excludes: M43.8 Other specified deforming dorsopathies ("kyphosis and lordosis (M40.-)")
• Type 2 Excludes: M95 Other acquired deformities of musculoskeletal system and connective tissue ("deforming dorsopathies (M40-M43)")

Diagnosis Index entries for M40.204

• Kyphosis, kyphotic (acquired) › thoracic region

Nearby codes

• M40.15 Other secondary kyphosis, thoracolumbar region
• M40.2 Other and unspecified kyphosis
• M40.20 Unspecified kyphosis
• M40.202 Unspecified kyphosis, cervical region
• M40.203 Unspecified kyphosis, cervicothoracic region
• M40.204 Unspecified kyphosis, thoracic region (this code)
• M40.205 Unspecified kyphosis, thoracolumbar region
• M40.209 Unspecified kyphosis, site unspecified
• M40.29 Other kyphosis
• M40.292 Other kyphosis, cervical region
• M40.293 Other kyphosis, cervicothoracic region