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ICD-10-CM 2027 diagnosis code

C63.00Malignant neoplasm of unspecified epididymis

✓ Billable / specificMale only

C63.00 is a valid, billable ICD-10-CM code for malignant neoplasm of unspecified epididymis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C63.00

C63.00 is the ICD-10-CM diagnosis code for malignant neoplasm of unspecified epididymis. It belongs to category C63 (malignant neoplasm of other and unspecified male genital organs), block C60-C63 (malignant neoplasms of male genital organs) and chapter 2 (neoplasms). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within C63.0, choose C63.00 (unspecified epididymis) only when documentation doesn't support a more specific option: right epididymis (C63.01) and left epididymis (C63.02).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 715 (Male Reproductive System and Other O.R. Procedures for Malignancy with CC/MCC, relative weight 2.2906), DRG 716 (Male Reproductive System and Other O.R. Procedures for Malignancy without CC/MCC, relative weight 1.4619), DRG 722 (Malignancy, Male Reproductive System with MCC, relative weight 1.6689), DRG 723 (Malignancy, Male Reproductive System with CC, relative weight 1.0697) and DRG 724 (Malignancy, Male Reproductive System without CC/MCC, relative weight 0.5901), in MDC 12 (Diseases and Disorders of the Male Reproductive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is on the CMS list of diagnoses consistent only with male patients (the sex-conflict edit itself was retired in FY2025).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 187.5 (malignant neoplasm of epididymis).

Notes that apply from higher levels

Instructions written at a parent level also apply to C63.00.

Broader instructions also apply from C60-C63 Malignant neoplasms of male genital organs and Chapter 2: Neoplasms.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 187.5Malignant neoplasm of epididymisapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about C63.00

Is C63.00 billable?

Yes. C63.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can C63.00 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict C63.00 as a principal diagnosis.

Is C63.00 a CC or MCC?

No. C63.00 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does C63.00 group to?

C63.00 is used in the MS-DRG v44.0 logic for MS-DRG 715 (Male Reproductive System and Other O.R. Procedures for Malignancy with CC/MCC), MS-DRG 716 (Male Reproductive System and Other O.R. Procedures for Malignancy without CC/MCC), MS-DRG 722 (Malignancy, Male Reproductive System with MCC), MS-DRG 723 (Malignancy, Male Reproductive System with CC) and MS-DRG 724 (Malignancy, Male Reproductive System without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for C63.00?

The CMS General Equivalence Mappings map C63.00 to ICD-9-CM 187.5.