J4A.0 — Restrictive allograft syndrome

Billable

Is J4A.0 billable?

Yes — J4A.0 is billable for FY2027. J4A.0 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. J4A.0 may be submitted for encounters from October 1, 2026 through September 30, 2027.

J4A.0 at a glance

Code	J4A.0
Description	Restrictive allograft syndrome
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does J4A.0 group to?

J4A.0 sits in MDC 04 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

190Chronic Obstructive Pulmonary Disease with MCCmedical
191Chronic Obstructive Pulmonary Disease with CCmedical
192Chronic Obstructive Pulmonary Disease without CC/MCCmedical

How is J4A.0 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to J4A.0. They show the wording a clinician may have documented, which often differs from the Tabular description.

Syndrome › restrictive allograft
Dysfunction › chronic › lung allograft › mixed

Code also

Two codes may be needed to describe the condition fully. Whether J4A.0 is sequenced first depends on the reason for the encounter.

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

Excludes1 — never code together — inherited from J40-J4B

The conditions below can never be reported together with J4A.0 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

bronchitis due to chemicals, gases, fumes and vapors (J68.0)

Code first — inherited from J4A

The underlying condition below must be sequenced before J4A.0. J4A.0 describes a manifestation and cannot be the principal or first-listed diagnosis.

, 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)

Use additional code — inherited from Chapter 10

Report an additional code alongside J4A.0 to fully describe the condition. J4A.0 is sequenced first.

code, where applicable, to identify:
exposure to environmental tobacco smoke (Z77.22)
exposure to tobacco smoke in the perinatal period (P96.81)
history of tobacco dependence (Z87.891)
occupational exposure to environmental tobacco smoke (Z57.31)
tobacco dependence (F17.-)
tobacco use (Z72.0)

Excludes2 — not included here — inherited from Chapter 10

The conditions below are not part of J4A.0, but a patient may have both at the same time. When documentation supports it, J4A.0 and the excluded code may both be reported.

certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
smoke inhalation (T59.81-)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Excludes2 — not included here — inherited from J40-J4B