2026 ICD-10-CM Diagnosis Code C63.00Malignant neoplasm of unspecified epididymis

ICD-10-CM Codes›C00–D49›C60-C63›C63

ICD-10-CM C63.00
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C63.00 is a billable ICD-10-CM diagnosis code for malignant neoplasm of unspecified epididymis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 715 through 716, 722 through 724. Coders also document this condition as carcinoma of epididymis and spermatic cord. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Male reproductive system cancers - all other types.

Code Identity

ICD-10-CM Code
C63.00
Billable Status
Yes — Valid for Submission
Code Describes
Malignant neoplasm of unspecified epididymis
Short Description
Malignant neoplasm of unspecified epididymis
Same as the full description in the CMS dataset.
Parent Code
C63.0
Malignant neoplasm of epididymis

Code Classification

ChapterC00–D49Neoplasms
SectionC60-C63Malignant neoplasms of male genital organs
CategoryC63Malignant neoplasm of other and unspecified male genital organs
This CodeC63.00Malignant neoplasm of unspecified epididymis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Carcinoma of epididymis and spermatic cord
  • Malignant neoplasm of epididymis
  • Malignant neoplasm of spermatic cord
  • Primary carcinoma of epididymis and spermatic cord
  • Primary malignant neoplasm of epididymis
  • Primary malignant neoplasm of spermatic cord

Clinical ClassificationClinical

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

CCSR NEO042
Male reproductive system cancers - all other types
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Epididymis

    the convoluted cordlike structure attached to the posterior of the testis. epididymis consists of the head (caput), the body (corpus), and the tail (cauda). a network of ducts leaving the testis joins into a common epididymal tubule proper which provides the transport, storage, and maturation of spermatozoa.

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
epididymisC63.0C79.82D07.69D29.3D40.8D49.59

Patient EducationClinical

Testicular Cancer

Testicular cancer is a cancer that develops in the tissues of one or both testicles. The testicles, or testes, are part of the male reproductive system. They make male hormones and sperm. They are two egg-shaped glands inside the scrotum, a sac of loose skin that lies below the penis. You can get cancer in one or both testicles.

The full article covers:

  • What is testicular cancer?
  • Who is most likely to develop testicular cancer?
  • What are the symptoms of testicular cancer?
  • How is testicular cancer diagnosed?
  • What are the treatments for testicular cancer?

Read the full article at MedlinePlus

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

Convert C63.00 to ICD-9-CMHistory

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

ICD-9-CM
187.5 Malig neo epididymis
Approximate The match is approximate rather than exact.

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 C63.00Overview

Is C63.00 (Malignant neoplasm of epididymis) a billable code?

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

What MS-DRG does C63.00 group to?

When malignant neoplasm of unspecified epididymis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 715, 716, 722, 723, 724, with relative weights from 0.6117 to 2.2373 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C63.00?

Under the General Equivalence Mappings, malignant neoplasm of unspecified epididymis converts to ICD-9-CM 187.5 (malig neo epididymis). The mapping is approximate, so confirm the match fits the documentation.

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.