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ICD-10-CM 2027 diagnosis code

K61.3Ischiorectal abscess

Not billable — use a more specific code

K61.3 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code last changed in FY2019 (effective October 1, 2018). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K61.3

K61.3 is the ICD-10-CM diagnosis code for ischiorectal abscess. It belongs to category K61 (abscess of anal and rectal regions), block K55-K64 (other diseases of intestines) and chapter 11 (diseases of the digestive system). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within K61 (abscess of anal and rectal regions), K61.3 is specifically for ischiorectal abscess. Related codes cover anal abscess (K61.0), rectal abscess (K61.1), Anorectal abscess (K61.2), Intrasphincteric abscess (K61.4) and Supralevator abscess (K61.5).

To report this condition, pick the subcode that matches the documentation: K61.31 (abscess) and K61.39 (abscess).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2019 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 566 (abscess of anal and rectal regions).

Specific codes under K61.3

Notes that apply from higher levels

Instructions written at a parent level also apply to K61.3.

› From K61 Abscess of anal and rectal regions
Includes
  • abscess of anal and rectal regions
  • cellulitis of anal and rectal regions

Broader instructions also apply from Chapter 11: Diseases of the digestive system.

ICD-9-CM equivalent

Converter →
  • 566Abscess of anal and rectal regionsapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • FY2019 (effective 10/1/2018): Expanded — no longer billable

Common questions about K61.3

Is K61.3 billable?

No. K61.3 is a header code. Report one of its more specific subcodes instead.

What is the ICD-9 code for K61.3?

The CMS General Equivalence Mappings map K61.3 to ICD-9-CM 566.