D38.4 Neoplasm of uncertain behavior of thymus

Billable ICD-10-CM code, FY2026.

Applies from D38 Neoplasm of uncertain behavior of middle ear and respiratory and intrathoracic organs

Excludes1 (never code together)

• neoplasm of uncertain behavior of heart (D48.7)

MS-DRG index

Defines the logic of DRG(s) 180-182 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 235.8 Neoplasm of uncertain behavior of pleura, thymus, and mediastinum (approximate)

Code annotations containing back-references to D38.4

Back-references to D38.4

• Type 1 Excludes: D44 Neoplasm of uncertain behavior of endocrine glands ("neoplasm of uncertain behavior of thymus (D38.4)")

Back-references to D38

• Type 1 Excludes: D49 Neoplasms of unspecified behavior ("neoplasms of uncertain behavior (D37-D44, D48)")

Nearby codes

• D38 Neoplasm of uncertain behavior of middle ear and respiratory and intrathoracic organs
• D38.0 Neoplasm of uncertain behavior of larynx
• D38.1 Neoplasm of uncertain behavior of trachea, bronchus and lung
• D38.2 Neoplasm of uncertain behavior of pleura
• D38.3 Neoplasm of uncertain behavior of mediastinum
• D38.4 Neoplasm of uncertain behavior of thymus (this code)
• D38.5 Neoplasm of uncertain behavior of other respiratory organs
• D38.6 Neoplasm of uncertain behavior of respiratory organ, unspecified