ICD-10-CM > S00-T88 > T80-T88 > T81 > T81.6 > T81.61 T81.61 Aseptic peritonitis due to foreign substance accidentally left during a procedure Non-Billable/Non-Specific Applicable To Chemical peritonitis Codes T81.61XA..., initial encounterT81.61XD..., subsequent encounterT81.61XS..., sequela