ICD-10-CM > M00-M99 > M40-M43 > M40 > M40.4 M40.4 Postural lordosis Non-Billable/Non-Specific Applicable To Acquired lordosis Codes M40.40Postural lordosis, site unspecifiedM40.45Postural lordosis, thoracolumbar regionM40.46Postural lordosis, lumbar regionM40.47Postural lordosis, lumbosacral region