Z88 vs Z91.0
Z88 (Allergy status to drugs, medicaments and biological substances) compared with Z91.0 (Allergy status, other than to drugs and biological substances), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. Z88 carries an Excludes2 note covering Z91.0: “Allergy status, other than to drugs and biological substances (Z91.0-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. Z91.0 carries an Excludes2 note covering Z88: “Allergy status to drugs, medicaments, and biological substances (Z88.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| Z88Allergy status to drugs, medicaments and biological substances | Z91.0Allergy status, other than to drugs and biological substances | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header Report instead: Z91.010, Z91.0110, Z91.0111, Z91.0112, Z91.0120 |
| 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 | Allergy status to drugs, medicaments and biological substances is a non-billable ICD-10-CM category code (Z88). | Allergy status, other than to drugs and biological substances is a non-billable ICD-10-CM category code (Z91.0). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources