N44.03Torsion of appendix testis

N44.03 is the ICD-10-CM diagnosis code for torsion of appendix testis. It belongs to category N44 (noninflammatory disorders of testis), block N40-N53 (diseases of male genital organs) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within N44.0 (torsion of testis), N44.03 is specifically for torsion of appendix testis. Related codes cover unspecified (N44.00), Extravaginal torsion of spermatic cord (N44.01), Intravaginal torsion of spermatic cord (N44.02) and torsion of appendix epididymis (N44.04).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 729 (Other Male Reproductive System Diagnoses with CC/MCC, relative weight 1.0544) and DRG 730 (Other Male Reproductive System Diagnoses without CC/MCC, relative weight 0.6597), 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 608.23 (torsion of appendix testis).