J70.1 vs J84.1
J70.1 and J84.1 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on J84.1
pulmonary fibrosis (chronic) following radiation (J70.1)
J70.1
Chronic and other pulmonary manifestations due to radiation
Billable
- Chapter 10
- Diseases of the respiratory system
- Section
- J60-J70
Use when the record says
- Fibrosis of lung following radiation
Indexed under
- Effect, adverse › radiationNOS › fibrosis of lung
- Fibrosis, fibrotic › lung › following radiation
- Bronchitis › chronic › due to › radiation (diffuse) (fibrinous) (hypostatic) (infective) (membranous)
- Effect, adverse › radiationNOS › pulmonary manifestations › chronic
- Inflammation, inflamed, inflammatory › respiratory, upper › due to › radiation (with exudation)
J84.1
Other interstitial pulmonary diseases with fibrosis
Not billable
- Chapter 10
- Diseases of the respiratory system
- Section
- J80-J84
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027