2026 ICD-10-CM Diagnosis Code J98.11Atelectasis

ICD-10-CM Codes›J00–J99›J96-J99›J98

ICD-10-CM J98.11
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J98.11 is a billable ICD-10-CM diagnosis code for atelectasis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 205 through 206. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pleurisy, pleural effusion and pulmonary collapse.

Code Identity

ICD-10-CM Code
J98.11
Billable Status
Yes — Valid for Submission
Code Describes
Atelectasis
Short Description
Atelectasis
Same as the full description in the CMS dataset.
Parent Code
J98.1
Pulmonary collapse

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ96-J99Other diseases of the respiratory system
CategoryJ98Other respiratory disorders
This CodeJ98.11Atelectasis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute atelectasis
  • Atelectasis
  • Atelectasis AND/OR obstructive pneumonitis of entire lung associated with direct extension of malignant neoplasm
  • Chronic atelectasis
  • Collapse of lung present
  • Complete atelectasis
  • Complete atelectasis of left lung
  • Complete atelectasis of right lung
  • Complications of anesthesia during labor and delivery
  • Compression atelectasis
  • Discoid atelectasis
  • Focal atelectasis
  • Linear atelectasis
  • Middle lobe syndrome
  • Obstetric anesthesia with pulmonary complications
  • Obstructive atelectasis
  • Postoperative atelectasis
  • Pressure collapse of lung due to anesthesia during labor and delivery
  • Pressure collapse of lung due to anesthesia in puerperium
  • Round atelectasis
  • Traumatic atelectasis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • newborn atelectasis
  • tuberculous atelectasis current disease A15

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.

    • Atelectasis(massive) (partial) (pressure) (pulmonary)
    • Right middle lobe syndrome
    • Syndrome
      • Brock's

Clinical ClassificationClinical

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

CCSR RSP011
Pleurisy, pleural effusion and pulmonary collapse
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Middle Lobe Syndrome

    atelectasis of the right middle pulmonary lobe, with chronic pneumonitis. (dorland, 27th ed)

Patient EducationClinical

Collapsed Lung

A collapsed lung happens when air enters the pleural space, the area between the lung and the chest wall. If it is a total collapse, it is called pneumothorax. If only part of the lung is affected, it is called atelectasis.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert J98.11 to ICD-9-CMHistory

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

ICD-9-CM
518.0 Pulmonary collapse
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 J98.11Overview

Is J98.11 (Pulmonary collapse) a billable code?

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

What MS-DRG does J98.11 group to?

When atelectasis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 205, 206, with relative weights from 0.9411 to 1.8310 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J98.11?

Under the General Equivalence Mappings, atelectasis converts to ICD-9-CM 518.0 (pulmonary collapse). 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.