K60.40 Rectal fistula, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Rectal fistula NOS

Applies from K60 Fissure and fistula of anal and rectal regions

Excludes1 (never code together)

• fissure and fistula of anal and rectal regions with abscess or cellulitis (K61.-)

Excludes2 (not included here)

• abscess or cellulitis of anal and rectal regions (K61.-)
• anal sphincter tear (healed) (nontraumatic) (old) (K62.81)

Applies from K60.4 Rectal fistula

Applicable to

• Fistula of rectum to skin

Excludes1 (never code together)

• congenital fistula (Q43.6)
• rectovaginal fistula (N82.3)
• vesicorectal fistual (N32.1)

Code first

• , if applicable:
• Crohn's disease (K50.-)
• ulcerative colitis (K51.-)

MS-DRG index

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

Code annotations containing back-references to K60.40

Back-references to K60.4

• Use Additional: K50 Crohn's disease [regional enteritis] ("rectal fistula (K60.4-)")
• Use Additional: K51 Ulcerative colitis ("rectal fistula (K60.4-)")

Back-references to K60

• Type 1 Excludes: K62.6 Ulcer of anus and rectum ("fissure and fistula of anus and rectum (K60.-)")
• Type 2 Excludes: K62.81 Anal sphincter tear (healed) (nontraumatic) (old) ("anal fissure (K60.-)")
• Type 2 Excludes: K63.2 Fistula of intestine ("fistula of anal and rectal regions (K60.-)")

Diagnosis Index entries for K60.40

• Fistula (cutaneous) › perineorectal
• Fistula (cutaneous) › perirectal
• Fistula (cutaneous) › rectal (infectional)
• Fistula (cutaneous) › rectum (to skin)

Nearby codes

• K60.321 Anal fistula, complex, initial
• K60.322 Anal fistula, complex, persistent
• K60.323 Anal fistula, complex, recurrent
• K60.329 Anal fistula, complex, unspecified
• K60.4 Rectal fistula
• K60.40 Rectal fistula, unspecified (this code)
• K60.41 Rectal fistula, simple
• K60.411 Rectal fistula, simple, initial
• K60.412 Rectal fistula, simple, persistent
• K60.413 Rectal fistula, simple, recurrent
• K60.419 Rectal fistula, simple, unspecified