E84.0 vs J99
E84.0 (Cystic fibrosis with pulmonary manifestations) compared with J99 (Respiratory disorders in diseases classified elsewhere), 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. J99 carries an Excludes1 note covering E84.0: “cystic fibrosis with pulmonary manifestations (E84.0)”
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
| E84.0Cystic fibrosis with pulmonary manifestations | J99Respiratory disorders in diseases classified elsewhere | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | J00-J99 — Diseases of the Respiratory System (J00-J99) |
| Definition | Cystic fibrosis with pulmonary manifestations is a billable ICD-10-CM diagnosis code (E84.0). | Respiratory disorders in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (J99). |
| Includes | mucoviscidosis | — |
| Use additional code | code to identify any infectious organism present, such as: Pseudomonas (B96.5) | — |
| Code first | — | underlying disease, such as: amyloidosis (E85.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources