ICD-10-CM > M00-M99 > M45-M49 > M48 > M48.4 > M48.46 M48.46 Fatigue fracture of vertebra, lumbar region Non-Billable/Non-Specific Codes M48.46XA..., initial encounter for fractureM48.46XD..., subsequent encounter for fracture with routine healingM48.46XG..., subsequent encounter for fracture with delayed healingM48.46XS..., sequela of fracture