ICD-10-CM > S00-T88 > T80-T88 > T81 > T81.8 > T81.89 T81.89 Other complications of procedures, not elsewhere classified Non-Billable/Non-Specific Use Additional code to specify complication, such as:postprocedural delirium (F05) Codes T81.89XA..., initial encounterT81.89XD..., subsequent encounterT81.89XS..., sequela