J84Other interstitial pulmonary diseases

J84 is the ICD-10-CM diagnosis code for other interstitial pulmonary diseases. It belongs to block J80-J84 (other respiratory diseases principally affecting the interstitium) and chapter 10 (diseases of the respiratory system). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: J84.0 (conditions), J84.1 (with fibrosis), J84.2 (pneumonia), J84.8 (diseases) and J84.9 (unspecified).

Don't report J84 together with the conditions in its Excludes1 note: drug-induced interstitial lung disorders (J70.2-J70.4) and interstitial emphysema (J98.2).

The conditions in its Excludes2 note aren't part of J84, but may be coded alongside it if the patient has both: lung diseases due to external agents (J60-J70).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.