2026 ICD-10-CM Diagnosis Code J84.09Other alveolar and parieto-alveolar conditions

ICD-10-CM Codes›J00–J99›J80-J84›J84

ICD-10-CM J84.09
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J84.09 is a billable ICD-10-CM diagnosis code for other alveolar and parieto-alveolar conditions. 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. Coders also document this condition as alveolar capillary block. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified lower respiratory disease.

Code Identity

ICD-10-CM Code
J84.09
Billable Status
Yes — Valid for Submission
Code Describes
Other alveolar and parieto-alveolar conditions
Short Description
Other alveolar and parieto-alveolar conditions
Same as the full description in the CMS dataset.
Parent Code
J84.0
Alveolar and parieto-alveolar conditions

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ80-J84Other respiratory diseases principally affecting the interstitium
CategoryJ84Other interstitial pulmonary diseases
This CodeJ84.09Other alveolar and parieto-alveolar conditions

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Alveolar capillary block
  • Alveolar pneumopathy
  • Parietoalveolar pneumopathy

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disorder(of)
      • alveolar NEC
    • Disorder(of)
      • parietoalveolar NEC
    • Pneumopathy NEC
      • alveolar
    • Pneumopathy NEC
      • parietoalveolar

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR RSP016
Other specified and unspecified lower respiratory disease
Default principal diagnosis: inpatient Yes · outpatient Yes

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 J84.09 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
516.8 Alveol pneumonopathy NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About J84.09Overview

Is J84.09 (Alveolar and parieto-alveolar conditions) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other alveolar and parieto-alveolar conditions on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does J84.09 group to?

When other alveolar and parieto-alveolar conditions 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 J84.09?

Under the General Equivalence Mappings, other alveolar and parieto-alveolar conditions converts to ICD-9-CM 516.8 (alveol pneumonopathy NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.