ICD-10-CM 2027
ICD-10 code for bladder malformation
From the official ICD-10-CM alphabetic index entry “Malformation (congenital) › bladder”. Page updated September 29, 2026.
About coding bladder malformation
The ICD-10-CM code for bladder malformation is Q64.79 (Other congenital malformations of bladder and urethra). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Q64.79.
Within Q64.7, choose Q64.79 (Other congenital malformations of bladder and urethra) only when documentation doesn't support a more specific option: unspecified congenital malformation of bladder and urethra (Q64.70), congenital prolapse of urethra (Q64.71), congenital prolapse of urinary meatus (Q64.72), congenital urethrorectal fistula (Q64.73), Double urethra (Q64.74) and Double urinary meatus (Q64.75).
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 698 (Other Kidney and Urinary Tract Diagnoses with MCC, relative weight 1.6398), DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC, relative weight 1.0003) and DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC, relative weight 0.6741), in MDC 11 (Diseases and Disorders of the Kidney and Urinary Tract), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific bladder malformation codes (official index)
Common questions about bladder malformation ICD-10 codes
What is the ICD-10 code for bladder malformation?
- Q64.79 — Other congenital malformations of bladder and urethra. More specific codes apply when the documentation supports them: Q64.5, Q64.6, Q64.31.
What is the ICD-10 code for aplasia bladder malformation?
- Q64.5 — Congenital absence of bladder and urethra.
What is the ICD-10 code for diverticulum bladder malformation?
- Q64.6 — Congenital diverticulum of bladder.
What is the ICD-10 code for neck obstruction bladder malformation?
- Q64.31 — Congenital bladder neck obstruction.
Is Q64.79 billable?
- Yes. Q64.79 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q64.79 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q64.79 as a principal diagnosis.
Is Q64.79 a CC or MCC?
- No. Q64.79 is neither a CC nor an MCC under MS-DRG v44.0.