Q55.0 ICD-10-CA code: Absence and aplasia of testis
Q55.0 is the ICD-10-CA code for “Absence and aplasia of testis” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
Q55.0Absence and aplasia of testis
ICD-10-CA · Canada · Also written Q550
Index terms
Entries in CIHI’s alphabetical index that lead to Q55.0. Searching the index by the condition the note names is how coders reach this code.
- Aplasia, testicle
- Agenesis, testicle
- Monorchism, monorchidism
- Anorchia, anorchism, anorchidism
- Absence (organ or part) (complete or partial), testis (congenital)
Notes for Q55.0
As CIHI prints them, with any note Q55.0 takes from the headings above it.
Includes
- Monorchism
Excludes
Conditions classified elsewhere.
- Congenital hydrocele (P83.5)hypospadias (Q54.-)From Q55 Other congenital malformations of male genital organs
- androgen resistance, testicular feminization — syndrome (E34.5)syndromes associated with anomalies in the number and form of chromosomes (Q90-Q99)From Q50-Q56 Congenital malformations of genital organs
- Inborn errors of metabolism (E70-E90)From Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Where Q55.0 sits
- 1ChapterChapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- 2Block Q50-Q56Congenital malformations of genital organs
- 3Category Q55Other congenital malformations of male genital organs
- 4Valid code Q55.0Absence and aplasia of testis
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code Q55.0 mean?
Q55.0 is the ICD-10-CA code for “Absence and aplasia of testis” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is Q55.0 in ICD-10-CA?
Q55.0 sits under Q55 Other congenital malformations of male genital organs, within Q50-Q56 Congenital malformations of genital organs, within Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99).
What coding notes apply to Q55.0?
ICD-10-CA lists Includes, Excludes notes for Q55.0, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside Q55.0
View Q55Q55.1Hypoplasia of testis and scrotumQ55.2Other congenital malformations of testis and scrotumQ55.3Atresia of vas deferensQ55.4Other congenital malformations of vas deferens, epididymis, seminal vesicles and prostateQ55.5Congenital absence and aplasia of penisQ55.6Other congenital malformations of penisQ55.8Other specified congenital malformations of male genital organsQ55.9Congenital malformation of male genital organ, unspecified