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

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
1 inclusion term

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43, Appendix B.

  • MS-DRG 698 — OTHER KIDNEY AND URINARY TRACT DIAGNOSES WITH MCC (MDC 11)
  • MS-DRG 699 — OTHER KIDNEY AND URINARY TRACT DIAGNOSES WITH CC (MDC 11)
  • MS-DRG 700 — OTHER KIDNEY AND URINARY TRACT DIAGNOSES WITHOUT CC/MCC (MDC 11)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Q64.31 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Congenital obstruction of vesicourethral orifice

Code Overview

Congenital bladder neck obstruction is a billable ICD-10-CM diagnosis code (Q64.31).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (9)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Verify Before Coding

  • CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name Q64.31 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 2 Excludes1 notes: N32.0 — Bladder-neck obstruction (via Q64.3.-), N35 — Urethral stricture (via Q64.3.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 8 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 698 (MDC 11), DRG 699 (MDC 11), DRG 700 (MDC 11).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):MAL003 — Genitourinary congenital anomalies (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

N13.9 — Obstructive and reflux uropathy, unspecified, Q64.2 — Congenital posterior urethral valves, Q64.32 — Congenital stricture of urethra, Q64.33 — Congenital stricture of urinary meatus, Q64.39 — Other atresia and stenosis of urethra and bladder neck, Q64.8 — Other specified congenital malformations of urinary system, Q64.9 — Congenital malformation of urinary system, unspecified

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Genitourinary congenital anomalies).

Q63.2 — Ectopic kidney, Q63.3 — Hyperplastic and giant kidney, Q63.8 — Other specified congenital malformations of kidney, Q63.9 — Congenital malformation of kidney, unspecified, Q64.0 — Epispadias, Q64.10 — Exstrophy of urinary bladder, unspecified, Q64.11 — Supravesical fissure of urinary bladder, Q64.12 — Cloacal exstrophy of urinary bladder, Q64.19 — Other exstrophy of urinary bladder, Q64.2 — Congenital posterior urethral valves, Q64.32 — Congenital stricture of urethra, Q64.33 — Congenital stricture of urinary meatus, Q64.39 — Other atresia and stenosis of urethra and bladder neck, Q64.4 — Malformation of urachus, Q64.5 — Congenital absence of bladder and urethra, Q64.6 — Congenital diverticulum of bladder, Q64.70 — Unspecified congenital malformation of bladder and urethra, Q64.71 — Congenital prolapse of urethra, Q64.72 — Congenital prolapse of urinary meatus, Q64.73 — Congenital urethrorectal fistula, +137 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Anomaly, anomalous”, “Malformation”, “Atresia, atretic”, …; these codes share that main term but sit in a different category of the Tabular List.

Q62.4 — Agenesis of ureter (ureter, agenesis), Q62.5 — Duplication of ureter (ureter, duplication), Q62.7 — Congenital vesico-uretero-renal reflux (ureter, vesico-uretero-renal reflux), Q62.8 — Other congenital malformations of ureter (ureter), Q63.0 — Accessory kidney (kidney, accessory), Q63.1 — Lobulated, fused and horseshoe kidney (kidney, horseshoe), Q63.2 — Ectopic kidney (kidney, malposition), Q63.3 — Hyperplastic and giant kidney (kidney, giant), Q63.8 — Other specified congenital malformations of kidney (kidney, specified type NEC), Q63.9 — Congenital malformation of kidney, unspecified (kidney), Q65.89 — Other specified congenital deformities of hip (rotation, hip or thigh), Q66.3 — Other congenital varus deformities of feet (foot NEC, varus), Q67.8 — Other congenital deformities of chest (thorax), Q74.0 — Other congenital malformations of upper limb(s), including shoulder girdle (arm), Q74.1 — Congenital malformation of knee (knee), Q74.2 — Other congenital malformations of lower limb(s), including pelvic girdle (toe), Q74.8 — Other specified congenital malformations of limb(s) (joint, specified type NEC), Q74.9 — Unspecified congenital malformation of limb(s) (joint), Q75.8 — Other specified congenital malformations of skull and face bones (forehead), Q75.9 — Congenital malformation of skull and face bones, unspecified (bone, face), +613 more

Contextual Map

Every relationship of Q64.31 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run Q64.31 with these 2 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

  • N32.0 — Bladder-neck obstruction[Excludes1](via Q64.3.-): “congenital bladder-neck obstruction (Q64.3-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • N35 — Urethral stricture[Excludes1](via Q64.3.-): “congenital urethral stricture (Q64.3-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 11 — Diseases and Disorders of the Kidney and Urinary Tract[MDC crossing]: “Diseases and Disorders of the Kidney and Urinary Tract — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 3,574 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries (9)

  • Anomaly, anomalous (congenital) (unspecified type), bladder, neck obstruction[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Atresia, atretic, bladder (neck), obstruction[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Atresia, atretic, vesicourethral orifice[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Malformation (congenital), bladder, neck obstruction[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Obstruction, obstructed, obstructive, bladder-neck (acquired), congenital[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Obstruction, obstructed, obstructive, vesicourethral orifice, congenital[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Stenosis, stenotic (cicatricial), bladder-neck (acquired), congenital[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Stenosis, stenotic (cicatricial), vesicourethral orifice[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • and 1 more

Nearest codes (25)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "Q64.31 — Congenital bladder neck obstruction." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/q64.31-congenital-bladder-neck-obstruction

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Congenital bladder neck obstruction

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q64.31 in its code family, with their registry titles.

View all codes in the Q64 family