I.C.1.g.1)(k)

Encounter for antibody testing

For an encounter for antibody testing that is not being performed to confirm a current COVID-19 infection, nor is a follow-up test after resolution of COVID-19, assign Z01.84, Encounter for antibody response examination. Follow the applicable guidelines above if the individual is being tested to confirm a current COVID-19 infection. For follow-up testing after a COVID-19 infection, see guideline I.C.1.g.1.j.

ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026 (effective October 1, 2025). Published by CMS and NCHS. Reproduced for reference — always verify against the official CMS release.