J4AHeader code — not billable

Chronic lung allograft dysfunction

Chapter
10. Diseases of the respiratory system
Category
J4A
Effective date
October 1, 2026

Related codes in category J4A

J4A.0Restrictive allograft syndromeYesJ4A.8Other chronic lung allograft dysfunctionYesJ4A.9Chronic lung allograft dysfunction, unspecifiedYes

Frequently asked questions

What is ICD-10 code J4A?

J4A is an ICD-10-CM diagnosis code for Chronic lung allograft dysfunction.

Is J4A a billable code?

No. J4A is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is J4A in?

J4A falls under Chapter 10: Diseases of the respiratory system.

When did J4A become effective?

J4A has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to J4A?

J4A belongs to category J4A, which includes 3 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.