Q43.6 Congenital fistula of rectum and anus

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.

Excludes1 (never code together)

• congenital fistula of anus with absence, atresia and stenosis (Q42.2)
• congenital fistula of rectum with absence, atresia and stenosis (Q42.0)
• congenital rectovaginal fistula (Q52.2)
• congenital urethrorectal fistula (Q64.73)
• pilonidal fistula or sinus (L05.-)

MS-DRG index

Defines the logic of DRG(s) 393-395 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 751.5 Other anomalies of intestine (approximate)

Code annotations containing back-references to Q43.6

Back-references to Q43.6

• Type 1 Excludes: K60.3 Anal fistula ("congenital fistula (Q43.6)")
• Type 1 Excludes: K60.4 Rectal fistula ("congenital fistula (Q43.6)")
• Type 1 Excludes: K60.5 Anorectal fistula ("congenital fistula (Q43.6)")

Diagnosis Index entries for Q43.6

• Fistula (cutaneous) › anus, anal (recurrent) (infectional) › congenital
• Fistula (cutaneous) › fecal › congenital
• Fistula (cutaneous) › rectum (to skin) › congenital

Nearby codes

• Q43.1 Hirschsprung's disease
• Q43.2 Other congenital functional disorders of colon
• Q43.3 Congenital malformations of intestinal fixation
• Q43.4 Duplication of intestine
• Q43.5 Ectopic anus
• Q43.6 Congenital fistula of rectum and anus (this code)
• Q43.7 Persistent cloaca
• Q43.8 Other specified congenital malformations of intestine
• Q43.9 Congenital malformation of intestine, unspecified