ICD-10-CM > M00-M99 > M40-M43 > M40 > M40.5 M40.5 Lordosis, unspecified Non-Billable/Non-Specific Codes M40.50Lordosis, unspecified, site unspecifiedM40.55Lordosis, unspecified, thoracolumbar regionM40.56Lordosis, unspecified, lumbar regionM40.57Lordosis, unspecified, lumbosacral region