ICD-10-CM > S00-T88 > T80-T88 > T80 > T80.6 > T80.69 T80.69 Other serum reaction due to other serum Non-Billable/Non-Specific Code Also , if applicable, arthropathy in hypersensitivity reactions classified elsewhere (M36.4) Codes T80.69XA..., initial encounterT80.69XD..., subsequent encounterT80.69XS..., sequela