ICD-10-CM > H00-H59 > H49-H52 > H50 > H50.6 > H50.65 H50.65 Medial rectus muscle entrapment Non-Billable/Non-Specific Codes H50.651Medial rectus muscle entrapment, right eyeH50.652Medial rectus muscle entrapment, left eyeH50.659Medial rectus muscle entrapment, unspecified eye