2026 ICD-10-CM Diagnosis Code E32.0Persistent hyperplasia of thymus
ICD-10-CM Codes›E00–E89›E20-E35›E32
- Billable — Valid for Submission
- Chronic Condition
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.
E32.0 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 23 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 23, ESRD (V21) category 23, ESRD (V24) category 23, and RxHCC Part D (V08) category 43 for payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
E32.0 no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.
Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
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
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Enlargement, enlarged See Also: Hypertrophy;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Convert E32.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About E32.0Overview
What is the ICD-10 code for persistent hyperplasia of thymus?
The ICD-10-CM code for persistent hyperplasia of thymus is E32.0 (sometimes written as E320). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
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.
Does E32.0 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. E32.0 mapped to HCC 23 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 23 (Other Significant Endocrine and Metabolic Disorders), ESRD (V21) category 23 (Other Significant Endocrine and Metabolic Disorders), ESRD (V24) category 23 (Other Significant Endocrine and Metabolic Disorders), and RxHCC Part D (V08) category 43 (Pituitary, Adrenal Gland, and Other Endocrine and Metabolic Disorders).
