2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N43.1 is a billable ICD-10-CM diagnosis code for infected hydrocele. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 727 through 728. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 10 closely related codes. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N43.1: its own notes plus those printed at N43 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From N43 Hydrocele and spermatocele applies to 7 codes
  • hydrocele of spermatic cord, testis or tunica vaginalis

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From N43 Hydrocele and spermatocele applies to 7 codes
  • congenital hydrocele (P83.5)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

  • code (B95-B97), to identify infectious agent

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N43.1Overview

What is the ICD-10 code for infected hydrocele?

The ICD-10-CM code for infected hydrocele is N43.1 (sometimes written as N431). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 0.8220 to 1.3694 depending on complications. Higher weights mean higher Medicare reimbursement.

Is N43.1 a CC or MCC?

CMS lists N43.1 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 10 closely related codes in its exclusion list.

Can N43.1 be reported with P83.5?

Not as a rule. The Excludes1 note at N43, which applies to N43.1, lists "congenital hydrocele (P83.5)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).