M40.40 Postural lordosis, site unspecified

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

Applies from M40.4 Postural lordosis

Applicable to

• Acquired lordosis

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 737.20 Lordosis (acquired) (postural) (approximate)

Code annotations containing back-references to M40.40

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 M40.40

• Lordosis › specified type NEC

Nearby codes

• M40.30 Flatback syndrome, site unspecified
• M40.35 Flatback syndrome, thoracolumbar region
• M40.36 Flatback syndrome, lumbar region
• M40.37 Flatback syndrome, lumbosacral region
• M40.4 Postural lordosis
• M40.40 Postural lordosis, site unspecified (this code)
• M40.45 Postural lordosis, thoracolumbar region
• M40.46 Postural lordosis, lumbar region
• M40.47 Postural lordosis, lumbosacral region
• M40.5 Lordosis, unspecified
• M40.50 Lordosis, unspecified, site unspecified