Excludes1 pair
J70.1 vs J84.1-
J70.1 and J84.1 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
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 › radiation NOS › fibrosis of lung
- Fibrosis, fibrotic › lung › following radiation
- Bronchitis › chronic › due to › radiation
- Effect, adverse › radiation NOS › pulmonary manifestations › chronic
- Inflammation, inflamed, inflammatory › respiratory, upper › due to › radiation
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