ICD-10-CM > M00-M99 > M45-M49 > M48 > M48.4 > M48.41 M48.41 Fatigue fracture of vertebra, occipito-atlanto-axial region Non-Billable/Non-Specific Codes M48.41XA..., initial encounter for fractureM48.41XD..., subsequent encounter for fracture with routine healingM48.41XG..., subsequent encounter for fracture with delayed healingM48.41XS..., sequela of fracture