J4A – Chronic lung allograft dysfunction

ICD-10-CM 2027 diagnosis code · Chronic lower respiratory diseases

Non-billable header

ICD-10-CM code J4A
Code
J4A (claims format: J4A)
Description
Chronic lung allograft dysfunction
Billable
No – use a more specific code below
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
10. Diseases of the respiratory system (J00-J99)
Block
J40-J4B Chronic lower respiratory diseases

Billable codes under J4A

J4A is a header code and cannot be used on claims. Choose the most specific code:

Notes for J4A

Code first:
  • , if applicable:
  • heart-lung transplant rejection (T86.31)
  • lung transplant rejection (T86.810)
  • other complications of heart-lung transplant (T86.39)
  • other complications of lung transplant (T86.818)
Code also:
  • , if applicable, bronchiolitis obliterans syndrome (J44.81)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block J40-J4B

Excludes1 (not coded here):
  • bronchitis due to chemicals, gases, fumes and vapors (J68.0)
Excludes2 (not included here):
  • cystic fibrosis (E84.-)

Frequently asked questions

What is ICD-10 code J4A?

J4A is the ICD-10-CM code for chronic lung allograft dysfunction, in the block J40-J4B (Chronic lower respiratory diseases).

Is J4A a billable code?

No. J4A is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.