Q55.0 — Absence and aplasia of testis
Q55.0 is a billable, specific ICD-10-CM code for absence and aplasia of testis. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Monorchism
Risk adjustment
Q55.0 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
Q55.0 is named in 2 Medicare coverage policies — 2 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A58828Billing and Coding: Treatment of Males with Low Testosterone
How Q55.0 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Q55.0.
- Anorchia, anorchism, anorchidism
- Monorchism, monorchidism
- Absence›testis(congenital)
- Agenesis›testicle
- Aplasia›testicle
- Malformation›testis and scrotum›aplasia
Related codes at this level
Codes that share Q55. If Q55.0 is not quite right, the correct code is usually one of these.
- Q55.1Hypoplasia of testis and scrotum
- Q55.2Other and unspecified congenital malformations of testis and scrotum
- Q55.3Atresia of vas deferens
- Q55.4Other congenital malformations of vas deferens, epididymis, seminal vesicles and prostate
- Q55.5Congenital absence and aplasia of penis
- Q55.6Other congenital malformations of penis
- Q55.7Congenital vasocutaneous fistula
- Q55.8Other specified congenital malformations of male genital organs
- Q55.9Congenital malformation of male genital organ, unspecified
Questions about Q55.0
- Is Q55.0 a billable ICD-10-CM code?
- Yes. Q55.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does Q55.0 sit in the tabular list?
- Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations of genital organs (Q50-Q56).