E32.9 Disease of thymus, unspecified

Billable ICD-10-CM code, FY2026.

Applies from E32 Diseases of thymus

Excludes1 (never code together)

• aplasia or hypoplasia of thymus with immunodeficiency (D82.1)
• myasthenia gravis (G70.0)

Risk adjustment (HCC)

• CMS-HCC V22: HCC 23 — Other Significant Endocrine and Metabolic Disorders
• RxHCC V08: HCC 43 — Pituitary, Adrenal Gland, and Other Endocrine and Metabolic Disorders
• ESRD V24: HCC 23

MS-DRG index

Defines the logic of DRG(s) 814-816 in MDC 16.

Approximate ICD-9-CM (GEMs)

• 254.9 Unspecified disease of thymus gland

Code annotations containing back-references to E32.9

Back-references to E32

• Code First: G63 Polyneuropathy in diseases classified elsewhere ("endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)")

Diagnosis Index entries for E32.9

• Disease, diseased › thymus (gland)
• Dysfunction › thymus

Nearby codes

• E32 Diseases of thymus
• E32.0 Persistent hyperplasia of thymus
• E32.1 Abscess of thymus
• E32.8 Other diseases of thymus
• E32.9 Disease of thymus, unspecified (this code)