2026 ICD-10-CM Diagnosis Code J4A.0Restrictive allograft syndrome

ICD-10-CM Codes›J00–J99›J40-J4A›J4A

ICD-10-CM J4A.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J4A.0 is a billable ICD-10-CM diagnosis code for restrictive allograft syndrome. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 190 through 192. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of transplanted organs or tissue, initial encounter; and Other specified and unspecified lower respiratory disease.

Code Identity

ICD-10-CM Code
J4A.0
Billable Status
Yes — Valid for Submission
Code Describes
Restrictive allograft syndrome
Short Description
Restrictive allograft syndrome
Same as the full description in the CMS dataset.
Parent Code
J4A
Chronic lung allograft dysfunction

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ40-J4AChronic lower respiratory diseases
CategoryJ4AChronic lung allograft dysfunction
This CodeJ4A.0Restrictive allograft syndrome

Tabular List NotesGuidance

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

Code Also

  • , if applicable, for mixed chronic lung allograft dysfunction, bronchiolitis obliterans syndrome J44.81

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.

    • Dysfunction
      • chronic
        • lung allograft
          • mixed
    • Syndrome
      • restrictive allograft

Clinical ClassificationClinical

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

CCSR INJ036
Complication of transplanted organs or tissue, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR RSP016
Other specified and unspecified lower respiratory disease
Default principal diagnosis: inpatient No · outpatient No

Code History & ChangesHistory

Replacement J4A.0 replaces the following previously assigned code(s):

  • J44.0 - Chr obstructive pulmon disease with (acute) lower resp infct
  • J44.0 - Chronic obstructive pulmon disease w acute lower resp infct
  • J44.1 - Chronic obstructive pulmonary disease w (acute) exacerbation
  • J44.9 - Chronic obstructive pulmonary disease, unspecified
FY 2024AddedAdded to the ICD-10-CM code setEffective October 1, 2023.
FY 2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About J4A.0Overview

Is J4A.0 (Chronic lung allograft dysfunction) a billable code?

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

What MS-DRG does J4A.0 group to?

When restrictive allograft syndrome is the principal diagnosis on an inpatient stay, it groups to MS-DRG 190, 191, 192, with relative weights from 0.6420 to 1.1077 depending on complications. Higher weights mean higher Medicare reimbursement.

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.