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ICD-10-CM 2027 diagnosis code

Q55.0Absence and aplasia of testis

✓ Billable / specificPOA exemptMale only

Q55.0 is a valid, billable ICD-10-CM code for absence and aplasia of testis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Anorchia, ICD-10 code for Monorchism.

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 Q55.0

Q55.0 is the ICD-10-CM diagnosis code for absence and aplasia of testis. It belongs to category Q55 (other congenital malformations of male genital organs), block Q50-Q56 (congenital malformations of genital organs) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Q55 (other congenital malformations of male genital organs), Q55.0 is specifically for absence and aplasia of testis. Related codes cover hypoplasia of testis and scrotum (Q55.1), other and unspecified congenital malformations of testis and scrotum (Q55.2), atresia of vas deferens (Q55.3), other congenital malformations of vas deferens, epididymis, seminal vesicles and prostate (Q55.4), congenital absence and aplasia of penis (Q55.5), other congenital malformations of penis (Q55.6), congenital vasocutaneous fistula (Q55.7), other specified congenital malformations of male genital organs (Q55.8) and 1 more.

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 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 is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

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 752.89 (other specified anomalies of genital organs).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Monorchism

Notes that apply from higher levels

Instructions written at a parent level also apply to Q55.0.

› From Q55 Other congenital malformations of male genital organs
Excludes1
  • congenital hydrocele (P83.5)
  • hypospadias (Q54.-)

Broader instructions also apply from Q50-Q56 Congenital malformations of genital organs and Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Alphabetic index entries

6 entries

Terms in the official ICD-10-CM index that lead to Q55.0.

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 →
  • 752.89Other specified anomalies of genital organsapproximate

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 Q55.0

Is Q55.0 billable?

Yes. Q55.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Q55.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Q55.0 as a principal diagnosis.

Is Q55.0 a CC or MCC?

No. Q55.0 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Q55.0 group to?

Q55.0 is used in the MS-DRG v44.0 logic for MS-DRG 729 (Other Male Reproductive System Diagnoses with CC/MCC) and MS-DRG 730 (Other Male Reproductive System Diagnoses 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 Q55.0?

The CMS General Equivalence Mappings map Q55.0 to ICD-9-CM 752.89.