ICD-10-CM > M00-M99 > M70-M79 > M77 > M77.5 M77.5 Other enthesopathy of foot and ankle Non-Billable/Non-Specific Codes M77.50Other enthesopathy of unspecified foot and ankleM77.51Other enthesopathy of right foot and ankleM77.52Other enthesopathy of left foot and ankle