FY2027
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Excludes1 pair

J70.4 vs J84.9

J70.4 and J84.9 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 J70.4
interstitial pneumonia NOS (J84.9)
J70.4

Drug-induced interstitial lung disorders, unspecified

BillableUnspecified
Chapter 10
Diseases of the respiratory system
Section
J60-J70
Indexed under
  • Disorder › lung, interstitial, drug-induced
  • Pneumonitis › chemotherapy
J84.9

Interstitial pulmonary disease, unspecified

BillableUnspecified
Chapter 10
Diseases of the respiratory system
Section
J80-J84
Use when the record says
  • Interstitial pneumonia NOS
Indexed under
  • Pneumonia › interstitial
  • Disease, diseased › lung › interstitial

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