2026 ICD-10-CM Diagnosis Code E32.0Persistent hyperplasia of thymus

ICD-10-CM Codes›E00–E89›E20-E35›E32

ICD-10-CM E32.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E32.0 is a billable ICD-10-CM diagnosis code for persistent hyperplasia 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 hypertrophy of thymus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified endocrine disorders.

Code Identity

ICD-10-CM Code
E32.0
Billable Status
Yes — Valid for Submission
Code Describes
Persistent hyperplasia of thymus
Short Description
Persistent hyperplasia 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 CodeE32.0Persistent hyperplasia of thymus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hypertrophy of thymus
  • Persistent hyperplasia of thymus

Tabular List NotesGuidance

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

Inclusion Terms

  • Hypertrophy of thymus

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.

    • Enlargement, enlarged
      • thymus (gland) (congenital)
    • Failure, failed
      • involution, thymus (gland)
    • Hyperplasia, hyperplastic
      • thymus (gland) (persistent)
    • Hypertrophy, hypertrophic
      • thymic, thymus (gland) (congenital)
    • Persistence, persistent(congenital)
      • thymus (gland) (hyperplasia)

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 E32.0 to ICD-9-CMHistory

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

ICD-9-CM
254.0 Persist hyperplas thymus
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 E32.0Overview

Is E32.0 (Diseases of thymus) a billable code?

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

What MS-DRG does E32.0 group to?

When persistent hyperplasia 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 E32.0?

Under the General Equivalence Mappings, persistent hyperplasia of thymus converts to ICD-9-CM 254.0 (persist hyperplas thymus). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.