ICD-10-CM > J00-J99 > J96-J99 > J98 > J98.5 J98.5 Diseases of mediastinum, not elsewhere classified Non-Billable/Non-Specific Type 2 Excludes abscess of mediastinum (J85.3) Codes J98.51MediastinitisJ98.59Other diseases of mediastinum, not elsewhere classified