ICD-10 Code J84.09 – Other alveolar and parieto-alveolar conditions (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J84.09 – Other alveolar and parieto-alveolar conditions
What it is
J84.09 identifies other specified disorders affecting the alveolar and parieto-alveolar lung tissue. Use it when the chart documents an interstitial or alveolar condition that does not fit a more specific ICD-10 category.
Clinical signs
Clinical features vary; refer to documentation. Patients may have shortness of breath, cough, abnormal chest imaging, or evidence of diffuse lung involvement, but the record must support the specific alveolar or parieto-alveolar disorder.
When to use this code
Use this code when the provider names an “other” alveolar or parieto-alveolar condition and no more specific code is available. It is appropriate when the diagnosis is established in the assessment, problem list, or discharge summary and the documentation does not point to a different interstitial lung disease code.
Do not use for
Do not use J84.09 for clearly named interstitial lung diseases with their own codes, such as idiopathic pulmonary fibrosis or pulmonary alveolar proteinosis. Check documentation if the condition is only suspected or described too vaguely.
Coding tip
Confirm the exact provider wording and code the most specific lung disorder documented before defaulting to this “other” category.