ICD-10-CM > H00-H59 > H49-H52 > H50 > H50.6 > H50.63 H50.63 Inferior rectus muscle entrapment Non-Billable/Non-Specific Codes H50.631Inferior rectus muscle entrapment, right eyeH50.632Inferior rectus muscle entrapment, left eyeH50.639Inferior rectus muscle entrapment, unspecified eye