2027 ICD-10-CM Diagnosis Code Q64.31Congenital bladder neck obstruction
ICD-10-CM Codes›Q00-Q99›Q60-Q64›Q64
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- POA Exempt
- Chronic Condition
Q64.31 is a billable ICD-10-CM diagnosis code for congenital bladder neck obstruction. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 698 through 700. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 8 closely related codes. 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
Code Classification
Present on Admission (POA)Billing
Q64.31 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations of the urinary system (Q60-Q64).
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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q64.31: its own notes plus those printed at 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.
- Congenital obstruction of vesicourethral orifice
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.
Notes
General instructions on how these codes are used.
- Codes from this chapter are not for use on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Q64.31, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming Q64.31: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
obstruction Q64.31
vesicourethral orifice Q64.31
Malformation (congenital) See Also: Anomaly;
neck obstruction Q64.31
Obstruction, obstructed, obstructive
congenital Q64.31
congenital Q64.31
Stenosis, stenotic (cicatricial) See Also: Stricture;
congenital Q64.31
vesicourethral orifice Q64.31
Stricture See Also: Stenosis;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
Questions About Q64.31Overview
What is the ICD-10 code for congenital bladder neck obstruction?
The ICD-10-CM code for congenital bladder neck obstruction is Q64.31 (sometimes written as Q6431). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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 699, 698, 700, with relative weights from 0.6740 to 1.6400 depending on complications. Higher weights mean higher Medicare reimbursement.
Is Q64.31 a CC or MCC?
CMS lists Q64.31 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 8 closely related codes in its exclusion list.
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. The code appears in the Congenital malformations of the urinary system (Q60-Q64) range of the CMS exempt list.
