2026 ICD-10-CM Diagnosis Code E32.9Disease of thymus, unspecified

ICD-10-CM Codes›E00–E89›E20-E35›E32

ICD-10-CM E32.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E32.9 is a billable ICD-10-CM diagnosis code for disease of thymus, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 814 through 816. Coders also document this condition as disorder of thymus gland. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified endocrine disorders.

Code Identity

ICD-10-CM Code
E32.9
Billable Status
Yes — Valid for Submission
Code Describes
Disease of thymus, unspecified
Short Description
Disease of thymus, unspecified
Same as the full description in the CMS dataset.
Parent Code
E32
Diseases of thymus

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE20-E35Disorders of other endocrine glands
CategoryE32Diseases of thymus
This CodeE32.9Disease of thymus, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Disorder of thymus gland

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

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

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR END015
Other specified and unspecified endocrine disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert E32.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
254.9 Disease of thymus NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E32.9Overview

Is E32.9 (Diseases of thymus) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disease of thymus, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does E32.9 group to?

When disease of thymus, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 814, 815, 816, with relative weights from 0.6320 to 2.1267 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of E32.9?

Under the General Equivalence Mappings, disease of thymus, unspecified converts to ICD-9-CM 254.9 (disease of thymus NOS). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.