The Body Part Thumb, Left is identified by letter "M" and occupies the 4th position in the ICD10-PCS procedure code structure.
Below a selection of ICD 10 PCS codes related to 0XRM
Replace of L Thumb with L Toe, Autol Sub, Perc Endo Approach
Replacement of L Thumb with R Toe, Autol Sub, Open Approach
Replace of L Thumb with R Toe, Autol Sub, Perc Endo Approach
Replacement of L Thumb with L Toe, Autol Sub, Open Approach