Q55.0

Absence and aplasia of testis

Billable code

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · Q55.0
Synonyms

Monorchism

Inherited from Q55Other congenital malformations of male genital organs
Excludes 1

congenital hydrocele (P83.5) hypospadias (Q54.-)

Inherited from Q50-Q56Congenital malformations of genital organs
Excludes 1

androgen insensitivity syndrome (E34.5-) syndromes associated with anomalies in the number and form of chromosomes (Q90-Q99)

Inherited from chapter 17Congenital malformations, deformations and chromosomal abnormalities
Excludes 2

inborn errors of metabolism (E70-E88)

Official Guidelines for Q55.0

FY 2026 ›
I.C.17Chapter-specific guidanceChapter 17: Congenital malformations, deformations, and chromosomal abnormalities (Q00-QA1)

Sections that reference Q55.0

Sections whose FY 2026 text names Q55.0, its Q55 category, or a range containing it — the chapter guidance above is the authoritative source.

Find Q55.0 in the alphabetic index

6 index paths lead to this code