2026 ICD-10-CM Diagnosis Code J84.9Interstitial pulmonary disease, unspecified
ICD-10-CM Codes›J00–J99›J80-J84›J84
- Billable — Valid for Submission
- Chronic Condition
J84.9 is a billable ICD-10-CM diagnosis code for interstitial pulmonary disease, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 196 through 198. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified lower respiratory disease.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chronic interstitial lung disease
- Congenital nephrotic syndrome, interstitial lung disease, epidermolysis bullosa syndrome
- Idiopathic interstitial pneumonitis
- Interstitial lung disease
- Interstitial lung disease due to and following radiotherapy
- Interstitial lung disease due to collagen vascular disease
- Interstitial lung disease due to connective tissue disease
- Interstitial lung disease due to granulomatous disease
- Interstitial lung disease due to juvenile polymyositis
- Interstitial lung disease due to metabolic disease
- Interstitial lung disease due to systemic disease
- Interstitial lung disease with systemic vasculitis
- Interstitial pneumonia
- Interstitial pneumonitis with autoimmune features
- Lung disease due to connective tissue disorder
- Nonspecific interstitial pneumonitis
- Pulmonary hypertension due to interstitial lung disease
- Pulmonary hypertension due to lung disease and/or hypoxia
- Vasculitis due to systemic disease
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Interstitial pneumonia NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Disease, diseased - See Also: Syndrome;
- interstitial - J84.9
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Disease, diseased
- lung
- interstitial
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- interstitial
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Desquamative Interstitial Pneumonia|DIP|RBILD|Respiratory Bronchiolitis Interstitial Lung Disease
a rare idiopathic interstitial pneumonia characterized by accumulation of macrophages in alveolar spaces and interstitial inflammation. it usually occurs in smokers. some patients develop progressive interstitial lung fibrosis.Interstitial Lung Disease
a category of lung diseases characterized by varying degrees of inflammation and fibrosis of the interstitial lung tissue. causes include occupational lung exposures and drugs. in a minority of cases there is no clear cause and such cases are termed idiopathic interstitial pneumonia.Pulmonary Surfactant Metabolism Dysfunction-3|Interstitial Lung Disease Due To ABCA3 Deficiency|SMDP3|Surfactant Apoprotein ABCA3 Deficiency|Surfactant Metabolism Dysfunction-3|Surfactant Protein ABCA3 Deficiency|Surfactant Protein ABCA3 Deficiency
an autosomal recessive condition caused by mutation(s) in the abca3 gene, encoding atp-binding cassette sub-family a member 3. it is characterized by severe respiratory insufficiency or failure in neonates or infants.
Patient EducationClinical
Interstitial Lung Diseases
Interstitial lung disease is the name for a large group of diseases that inflame or scar the lungs. The inflammation and scarring make it hard to get enough oxygen. The scarring is called pulmonary fibrosis.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert J84.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J84.9Overview
Is J84.9 (Other interstitial pulmonary diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report interstitial pulmonary disease, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does J84.9 group to?
When interstitial pulmonary disease, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 196, 197, 198, with relative weights from 0.7162 to 1.8872 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of J84.9?
Under the General Equivalence Mappings, interstitial pulmonary disease, unspecified converts to ICD-9-CM 516.9 (alveol pneumonopathy NOS). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
