V31 Twin birth mate liveborn 
V31.0 Twin birth mate liveborn born in hospital 
V31.00 Twin birth mate liveborn born in hospital delivered without cesarean section convert V31.00 to ICD-10-CM
V31.01 Twin birth mate liveborn born in hospital delivered by cesarean section convert V31.01 to ICD-10-CM V31.1 Twin birth mate liveborn born before admission to hospital convert V31.1 to ICD-10-CM V31.2 Twin birth mate liveborn born outside hospital and not hospitalized convert V31.2 to ICD-10-CM