ICD-10-CM > H00-H59 > H10-H11 > H11 > H11.0 > H11.05 H11.05 Peripheral pterygium of eye, progressive Non-Billable/Non-Specific Codes H11.051Peripheral pterygium, progressive, right eyeH11.052Peripheral pterygium, progressive, left eyeH11.053Peripheral pterygium, progressive, bilateralH11.059Peripheral pterygium, progressive, unspecified eye