J4A vs J68.0
J4A (Chronic lung allograft dysfunction) compared with J68.0 (Bronchitis and pneumonitis due to chemicals, gases, fumes and vapors), 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. J4A carries an Excludes1 note covering J68.0: “bronchitis due to chemicals, gases, fumes and vapors (J68.0)”
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
| J4AChronic lung allograft dysfunction | J68.0Bronchitis and pneumonitis due to chemicals, gases, fumes and vapors | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | J00-J99 — Diseases of the Respiratory System (J00-J99) | J00-J99 — Diseases of the Respiratory System (J00-J99) |
| Definition | Chronic lung allograft dysfunction is a non-billable ICD-10-CM category code (J4A). | Bronchitis and pneumonitis due to chemicals, gases, fumes and vapors is a billable ICD-10-CM diagnosis code (J68.0). |
| Includes | — | Chemical bronchitis (acute) |
| Use additional code | — | code to identify associated respiratory conditions, such as: acute respiratory failure (J96.0-) |
| Code first | , if applicable: heart-lung transplant rejection (T86.31) | (T51-T65) to identify cause |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources