ICD-10-CM 2027
ICD-10 code for rectal infectional fistula
From the official ICD-10-CM alphabetic index entry “Fistula (cutaneous) › rectal (infectional)”. Page updated September 29, 2026.
About coding rectal infectional fistula
The ICD-10-CM code for rectal infectional fistula is K60.40 (Rectal fistula, unspecified). The official index lists 20 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K60.40.
Within K60.4, choose K60.40 (unspecified) only when documentation doesn't support a more specific option: simple (K60.41) and complex (K60.42).
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 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), in MDC 06 (Diseases and Disorders of the Digestive System), 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 rectal infectional fistula codes (official index)
- complex K60.429 — Rectal fistula, complex, unspecified
- chronic K60.422 — Rectal fistula, complex, persistent
- initial K60.421 — Rectal fistula, complex, initial
- new K60.421 — Rectal fistula, complex, initial
- occurring following complete healing K60.423 — Rectal fistula, complex, recurrent
- persistent K60.422 — Rectal fistula, complex, persistent
- recurrent K60.423 — Rectal fistula, complex, recurrent
- extrasphincteric K60.42 — Rectal fistula, complex
- high intersphincteric K60.42 — Rectal fistula, complex
- low intersphincteric K60.41 — Rectal fistula, simple
- simple K60.419 — Rectal fistula, simple, unspecified
- chronic K60.412 — Rectal fistula, simple, persistent
- initial K60.411 — Rectal fistula, simple, initial
- new K60.411 — Rectal fistula, simple, initial
- occurring following complete healing K60.413 — Rectal fistula, simple, recurrent
- persistent K60.412 — Rectal fistula, simple, persistent
- recurrent K60.413 — Rectal fistula, simple, recurrent
- superficial K60.41 — Rectal fistula, simple
- suprasphincteric K60.42 — Rectal fistula, complex
- transsphincteric K60.42 — Rectal fistula, complex
Common questions about rectal infectional fistula ICD-10 codes
What is the ICD-10 code for rectal infectional fistula?
- K60.40 — Rectal fistula, unspecified. More specific codes apply when the documentation supports them: K60.429, K60.422, K60.421, K60.421 and others below.
What is the ICD-10 code for complex rectal infectional fistula?
- K60.429 — Rectal fistula, complex, unspecified.
What is the ICD-10 code for extrasphincteric rectal infectional fistula?
- K60.42 — Rectal fistula, complex (header code; choose a more specific subcode).
What is the ICD-10 code for high intersphincteric rectal infectional fistula?
- K60.42 — Rectal fistula, complex (header code; choose a more specific subcode).
What is the ICD-10 code for low intersphincteric rectal infectional fistula?
- K60.41 — Rectal fistula, simple (header code; choose a more specific subcode).
What is the ICD-10 code for simple rectal infectional fistula?
- K60.419 — Rectal fistula, simple, unspecified.
What is the ICD-10 code for superficial rectal infectional fistula?
- K60.41 — Rectal fistula, simple (header code; choose a more specific subcode).
Is K60.40 billable?
- Yes. K60.40 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K60.40 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K60.40 as a principal diagnosis.
Is K60.40 a CC or MCC?
- No. K60.40 is neither a CC nor an MCC under MS-DRG v44.0.