J98.5 – Diseases of mediastinum, not elsewhere classified

ICD-10-CM 2027 diagnosis code · Other diseases of the respiratory system

Non-billable header

ICD-10-CM code J98.5

Code: J98.5 (claims format: J985)
Description: Diseases of mediastinum, not elsewhere classified
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: J96-J99 Other diseases of the respiratory system
Parent codes: J98

Billable codes under J98.5

J98.5 is a header code and cannot be used on claims. Choose the most specific code:

J98.51 – MediastinitisBillable
J98.59 – Other diseases of mediastinum, not elsewhere classifiedBillable

Notes for J98.5

Excludes2 (not included here):

abscess of mediastinum (J85.3)

Notes inherited from parent codes

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

J98 – Other respiratory disorders

Excludes1 (not coded here):

newborn apnea (P28.4-)
newborn sleep apnea (P28.3-)

Excludes2 (not included here):

apnea NOS (R06.81)
sleep apnea (G47.3-)

Use additional code:

code 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)

Related codes in J98

J98.0 – Diseases of bronchus, not elsewhere classifiedHeader
J98.1 – Pulmonary collapseHeader
J98.2 – Interstitial emphysemaBillable
J98.3 – Compensatory emphysemaBillable
J98.4 – Other disorders of lungBillable
J98.6 – Disorders of diaphragmBillable
J98.8 – Other specified respiratory disordersBillable
J98.9 – Respiratory disorder, unspecifiedBillable

Frequently asked questions

What is ICD-10 code J98.5?

J98.5 is the ICD-10-CM code for diseases of mediastinum, not elsewhere classified, in the block J96-J99 (Other diseases of the respiratory system).

Is J98.5 a billable code?

No. J98.5 is a header code with more specific child codes; report one of the billable codes listed above.

What category does J98.5 belong to?

It belongs to category J98 – Other respiratory disorders.

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.