ICD-10-CM 2027
ICD-10 code for chest disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › chest”. Page updated September 29, 2026.
About coding chest disease
The ICD-10-CM code for chest disease is J98.9 (Respiratory disorder, unspecified).
Within J98, choose J98.9 (Respiratory disorder, unspecified) only when documentation doesn't support a more specific option: diseases of bronchus, not elsewhere classified (J98.0), pulmonary collapse (J98.1), interstitial emphysema (J98.2), Compensatory emphysema (J98.3), other disorders of lung (J98.4), diseases of mediastinum, not elsewhere classified (J98.5), disorders of diaphragm (J98.6) and other specified respiratory disorders (J98.8).
Use an additional 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.-) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about chest disease ICD-10 codes
What is the ICD-10 code for chest disease?
- J98.9 — Respiratory disorder, unspecified.
Is J98.9 billable?
- Yes. J98.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J98.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J98.9 as a principal diagnosis.
Is J98.9 a CC or MCC?
- No. J98.9 is neither a CC nor an MCC under MS-DRG v44.0.