2026 ICD-10-CM Diagnosis Code N43.1Infected hydrocele

ICD-10-CM Codes›N00–N99›N40-N53›N43

ICD-10-CM N43.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N43.1 is a billable ICD-10-CM diagnosis code for infected hydrocele. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 727 through 728. Coders also document this condition as hydrocele of testis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory conditions of male genital organs and Other specified male genital disorders.

Code Identity

ICD-10-CM Code
N43.1
Billable Status
Yes — Valid for Submission
Code Describes
Infected hydrocele
Short Description
Infected hydrocele
Same as the full description in the CMS dataset.
Parent Code
N43
Hydrocele and spermatocele

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN40-N53Diseases of male genital organs
CategoryN43Hydrocele and spermatocele
This CodeN43.1Infected hydrocele

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hydrocele of testis
  • Hydrocele of tunica vaginalis
  • Infected hydrocele

Tabular List NotesGuidance

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

Use Additional Code

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.

    • Hydrocele(spermatic cord) (testis) (tunica vaginalis)
      • infected

Clinical ClassificationClinical

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

CCSR GEN013
Inflammatory conditions of male genital organs
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR GEN016
Other specified male genital disorders
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Testicular Disorders

Testicles, or testes, make male hormones and sperm. They are two egg-shaped organs inside the scrotum, the loose sac of skin behind the penis. It's easy to injure your testicles because they are not protected by bones or muscles. Men and boys should wear athletic supporters when they play sports.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N43.1 to ICD-9-CMHistory

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

ICD-9-CM
603.1 Infected hydrocele
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 N43.1Overview

Is N43.1 (Hydrocele and spermatocele) a billable code?

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

What MS-DRG does N43.1 group to?

When infected hydrocele is the principal diagnosis on an inpatient stay, it groups to MS-DRG 727, 728, with relative weights from 0.8112 to 1.4829 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N43.1?

Under the General Equivalence Mappings, infected hydrocele converts to ICD-9-CM 603.1 (infected hydrocele). 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.