2027 ICD-10-CM Diagnosis Code Q55.0Absence and aplasia of testis

ICD-10-CM Codes›Q00-Q99›Q50-Q56›Q55

ICD-10-CM Q55.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Q55.0 is a billable ICD-10-CM diagnosis code for absence and aplasia of testis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 729 through 730. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Genitourinary congenital anomalies.

Code Identity

ICD-10-CM Code
Q55.0
Billable Status
Yes — Valid for Submission
Code Describes
Absence and aplasia of testis
Short Description
Absence and aplasia of testis
Same as the full description in the CMS dataset.
Parent Code
Q55
Other congenital malformations of male genital organs

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ50-Q56Congenital malformations of genital organs
CategoryQ55Other congenital malformations of male genital organs
This CodeQ55.0Absence and aplasia of testis

Present on Admission (POA)Billing

Q55.0 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations of genital organs (Q50-Q56).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Absence of testicle in scrotum
  • Absent testes
  • Absent testicle
  • Agenesis of testis
  • Anorchid azoospermia
  • Aplasia of testicle
  • Bilateral testicular agenesis
  • Congenital absence of both testes
  • Congenital absence of germinal epithelium of testes
  • Congenital absence of gonads
  • Congenital absence of left testis
  • Congenital absence of right testis
  • Monorchism
  • PAGOD syndrome
  • Position of testicle - finding

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Q55.0: its own notes plus those printed at Q55, block Q50-Q56, and Chapter 17. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Monorchism

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Q55 Other congenital malformations of male genital organs applies to 18 codes
From Block Q50-Q56 Congenital malformations of genital organs applies to 91 codes
  • androgen insensitivity syndrome (E34.5-)
  • syndromes associated with anomalies in the number and form of chromosomes (Q90-Q99)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • inborn errors of metabolism (E70-E88)

Notes

General instructions on how these codes are used.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • Codes from this chapter are not for use on maternal records

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MAL003
Genitourinary congenital anomalies
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Testicular Disorders

Testicles, or testes, make male hormones and sperm. They are two egg-shaped organs inside the scrotum, the loose sac of skin behind the penis. It's easy to injure your testicles because they are not protected by bones or muscles. Men and boys should wear athletic supporters when they play sports.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Q55.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
752.89 Genital organ anom NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Q55.0Overview

What is the ICD-10 code for absence and aplasia of testis?

The ICD-10-CM code for absence and aplasia of testis is Q55.0 (sometimes written as Q550). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Q55.0 (Other congenital malformations of male genital organs) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report absence and aplasia of testis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Q55.0 group to?

When absence and aplasia of testis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 729, 730, with relative weights from 0.6595 to 1.0553 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q55.0 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for absence and aplasia of testis on inpatient claims. The code appears in the Congenital malformations of genital organs (Q50-Q56) range of the CMS exempt list.

Can Q55.0 be reported with P83.5?

Not as a rule. The Excludes1 note at Q55, which applies to Q55.0, lists "congenital hydrocele (P83.5)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).