Z01.82 vs Z01.84
Z01.82 (Encounter for allergy testing) compared with Z01.84 (Encounter for antibody response examination), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. Z01.82 carries an Excludes1 note covering Z01.84: “encounter for antibody response examination (Z01.84)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. Z01.84 carries an Excludes1 note covering Z01.82: “encounter for allergy testing (Z01.82)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| Z01.82Encounter for allergy testing | Z01.84Encounter for antibody response examination | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Encounter for allergy testing is a billable ICD-10-CM diagnosis code (Z01.82). | Encounter for antibody response examination is a billable ICD-10-CM diagnosis code (Z01.84). |
| Includes | routine examination of specific system | routine examination of specific system Encounter for immunity status testing |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources