ICD-10-CM > H00-H59 > H15-H22 > H21 > H21.8 > H21.81 H21.81 Floppy iris syndrome Billable/Specific Copy Code Copy Description Applicable To Intraoperative floppy iris syndrome (IFIS) Use Additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)