M40.13 Other secondary kyphosis, cervicothoracic 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) 551-552 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 737.41 Kyphosis associated with other conditions (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to M40.13

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 M40.13

• Kyphosis, kyphotic (acquired) › secondary NEC › cervicothoracic region

Nearby codes

• M40.04 Postural kyphosis, thoracic region
• M40.05 Postural kyphosis, thoracolumbar region
• M40.1 Other secondary kyphosis
• M40.10 Other secondary kyphosis, site unspecified
• M40.12 Other secondary kyphosis, cervical region
• M40.13 Other secondary kyphosis, cervicothoracic region (this code)
• M40.14 Other secondary kyphosis, thoracic region
• M40.15 Other secondary kyphosis, thoracolumbar region
• M40.2 Other and unspecified kyphosis
• M40.20 Unspecified kyphosis
• M40.202 Unspecified kyphosis, cervical region