2026 ICD-10-CM Diagnosis Code E32.8Other diseases of thymus

ICD-10-CM Codes›E00–E89›E20-E35›E32

ICD-10-CM E32.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E32.8 is a billable ICD-10-CM diagnosis code for other diseases of thymus. 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 atrophy 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
E32.8
Billable Status
Yes — Valid for Submission
Code Describes
Other diseases of thymus
Short Description
Other diseases of thymus
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 CodeE32.8Other diseases of thymus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Atrophy of thymus gland
  • Cyst of mediastinum
  • Cyst of thymus gland
  • Hematoma of thymus
  • Hemorrhage of thymus

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • aplasia or hypoplasia with immunodeficiency D82.1
  • thymoma D15.0

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.

    • Asthma, asthmatic(bronchial) (catarrh) (spasmodic)
      • Kopp's
    • Asthma, asthmatic(bronchial) (catarrh) (spasmodic)
      • thymic
    • Atrophy, atrophic(of)
      • fatty, thymus (gland)
    • Atrophy, atrophic(of)
      • thymus (fatty)
    • Convulsions(idiopathic)
      • thymic
    • Cyst(colloid) (mucous) (simple) (retention)
      • thymus (gland)
    • Degeneration, degenerative
      • thymus (gland)
    • Degeneration, degenerative
      • thymus (gland)
        • fatty
    • Disease, diseased
      • thymus (gland)
        • specified NEC
    • Emphysema(atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular)
      • thymus (gland) (congenital)
    • Fibrosis, fibrotic
      • thymus (gland)
    • Hemorrhage, hemorrhagic(concealed)
      • thymus (gland)
    • Infiltrate, infiltration
      • thymus (gland) (fatty)
    • Inflammation, inflamed, inflammatory(with exudation)
      • thymus (gland)
    • Involution, involutional
      • thymus failure
    • Kopp's asthma
    • Lymphatism
    • Necrosis, necrotic(ischemic)
      • thymus (gland)
    • Status(post)
      • lymphaticus
    • Status(post)
      • thymicolymphaticus
    • Status(post)
      • thymicus
    • Status(post)
      • thymolymphaticus
    • Thymitis

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 E32.8 to ICD-9-CMHistory

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

ICD-9-CM
254.8 Diseases of thymus NEC
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 E32.8Overview

Is E32.8 (Diseases of thymus) a billable code?

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

What MS-DRG does E32.8 group to?

When other diseases of thymus 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 E32.8?

Under the General Equivalence Mappings, other diseases of thymus converts to ICD-9-CM 254.8 (diseases of thymus NEC). 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.