2026 ICD-10-CM Diagnosis Code M96.A4Flail chest associated with chest compression and cardiopulmonary resuscitation

ICD-10-CM Codes›M00–M99›M96›M96

ICD-10-CM M96.A4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M96.A4 is a billable ICD-10-CM diagnosis code for flail chest associated with chest compression and cardiopulmonary resuscitation. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 183 through 185, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fracture of torso, initial encounter.

Code Identity

ICD-10-CM Code
M96.A4
Billable Status
Yes — Valid for Submission
Code Describes
Flail chest associated with chest compression and cardiopulmonary resuscitation
Short Description
Flail chest assoc with chest comprsn and cardiopulm resus
Parent Code
M96.A
Fracture of ribs, sternum and thorax associated with compression of the chest and cardiopulmonary resuscitation

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM96Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified
CategoryM96Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified
This CodeM96.A4Flail chest associated with chest compression and cardiopulmonary resuscitation

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.

    • Flail
      • chest
        • associated with chest compression and cardiopulmonary resuscitation

Clinical ClassificationClinical

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

CCSR INJ003
Fracture of torso, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement M96.A4 replaces the following previously assigned code(s):

  • M96.89 - Oth intraop and postproc comp and disorders of the ms sys
  • Y84.8 - Oth medical procedures cause abn react/compl, w/o misadvnt
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M96.A4Overview

Is M96.A4 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report flail chest associated with chest compression and cardiopulmonary resuscitation on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M96.A4 group to?

When flail chest associated with chest compression and cardiopulmonary resuscitation is the principal diagnosis on an inpatient stay, it groups to MS-DRG 183, 184, 185, 963, 964, 965, with relative weights from 0.7865 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

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.