2026 ICD-10-CM Diagnosis Code Q64.31Congenital bladder neck obstruction

ICD-10-CM Codes›Q00-Q99›Q60-Q64›Q64

ICD-10-CM Q64.31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q64.31 is a billable ICD-10-CM diagnosis code for congenital bladder neck obstruction. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 698 through 700. The code is exempt from POA reporting. Coders also document this condition as congenital hydronephrosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Genitourinary congenital anomalies.

Code Identity

ICD-10-CM Code
Q64.31
Billable Status
Yes — Valid for Submission
Code Describes
Congenital bladder neck obstruction
Short Description
Congenital bladder neck obstruction
Same as the full description in the CMS dataset.
Parent Code
Q64.3
Other atresia and stenosis of urethra and bladder neck

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ60-Q64Congenital malformations of the urinary system
CategoryQ64Other congenital malformations of urinary system
This CodeQ64.31Congenital bladder neck obstruction

Present on Admission (POA)Billing

Q64.31 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Congenital hydronephrosis
  • Congenital hydronephrosis due to urinary bladder obstruction
  • Congenital malformation of urinary bladder and urethra
  • Congenital obstruction of neck of urinary bladder
  • Congenital secondary hydronephrosis
  • Congenital stenosis of neck of urinary bladder
  • Congenital stricture of urethra
  • Congenital stricture of vesicourethral orifice
  • Stenosis of neck of urinary bladder

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Congenital obstruction of vesicourethral orifice

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Anomaly, anomalous(congenital) (unspecified type)
      • bladder
        • neck obstruction
    • Atresia, atretic
      • bladder (neck)
        • obstruction
    • Atresia, atretic
      • vesicourethral orifice
    • Malformation(congenital)
      • bladder
        • neck obstruction
    • Obstruction, obstructed, obstructive
      • bladder-neck (acquired)
        • congenital
    • Obstruction, obstructed, obstructive
      • vesicourethral orifice
        • congenital
    • Stenosis, stenotic(cicatricial)
      • bladder-neck (acquired)
        • congenital
    • Stenosis, stenotic(cicatricial)
      • vesicourethral orifice
    • Stricture
      • vesicourethral orifice
        • congenital

Clinical ClassificationClinical

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

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

Clinical InformationClinical

  • Congenital Hydronephrosis

    collection of urine in the renal pelvis that results in dilatation of the renal pelvis and calyces that is present at birth.

Patient EducationClinical

Urethral Disorders

The urethra is the tube that allows urine to pass out of the body. In men, it's a long tube that runs through the penis. It also carries semen in men. In women, it's short and is just above the vagina. Urethral problems may happen due to aging, illness, or injury. They include:

Read the full article at MedlinePlus

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

Convert Q64.31 to ICD-9-CMHistory

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

ICD-9-CM
753.6 Congen urethral stenosis
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Q64.31Overview

Is Q64.31 (Other atresia and stenosis of urethra and bladder neck) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report congenital bladder neck obstruction on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q64.31 group to?

When congenital bladder neck obstruction is the principal diagnosis on an inpatient stay, it groups to MS-DRG 698, 699, 700, with relative weights from 0.6899 to 1.6544 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q64.31 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 congenital bladder neck obstruction on inpatient claims.

What is the ICD-9 equivalent of Q64.31?

Under the General Equivalence Mappings, congenital bladder neck obstruction converts to ICD-9-CM 753.6 (congen urethral stenosis). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.