2027 ICD-10-CM Diagnosis Code K61.39Other ischiorectal abscess

ICD-10-CM Codes›K00–K95›K55-K64›K61

ICD-10-CM K61.39
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K61.39 is a billable ICD-10-CM diagnosis code for other ischiorectal abscess. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 393 through 395, 791, 793. Coders also document this condition as anorectal abscess. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Anal and rectal conditions and Peritonitis and intra-abdominal abscess.

Code Identity

ICD-10-CM Code
K61.39
Billable Status
Yes — Valid for Submission
Code Describes
Other ischiorectal abscess
Short Description
Other ischiorectal abscess
Same as the full description in the CMS dataset.
Parent Code
K61.3
Ischiorectal abscess

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK55-K64Other diseases of intestines
CategoryK61Abscess of anal and rectal regions
This CodeK61.39Other ischiorectal abscess

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anorectal abscess
  • Ischiorectal abscess
  • Ischiorectal fistula
  • Perirectal abscess
  • Transsphincteric anal fistula

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K61.39: its own notes plus those printed at K61 and Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From K61 Abscess of anal and rectal regions applies to 7 codes
  • abscess of anal and rectal regions
  • cellulitis of anal and rectal regions

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Abscess of ischiorectal fossa
  • Ischiorectal abscess, NOS

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name K61.39, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming K61.39: they are not reported together with it, unless the two conditions are unrelated.

  • K61.1 Rectal abscess
    ischiorectal abscess (K61.39)

Excludes2 5

These codes carry an Excludes2 note naming K61.39: its condition is not part of those codes, and both may be reported when the patient has both.

  • K60 Fissure and fistula of anal and rectal regions
    abscess or cellulitis of anal and rectal regions (K61.-) names K61.-, which includes this code
  • K63.0 Abscess of intestine
    abscess of anal and rectal regions (K61.-) names K61.-, which includes this code
  • L02 Cutaneous abscess, furuncle and carbuncle
    abscess of anus and rectal regions (K61.-) names K61.-, which includes this code
  • L03 Cellulitis and acute lymphangitis
    cellulitis of anal and rectal region (K61.-) names K61.-, which includes this code
  • L03.31 Cellulitis of trunk
    cellulitis of anal and rectal regions (K61.-) names K61.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG015
Anal and rectal conditions
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG016
Peritonitis and intra-abdominal abscess
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Abscess

An abscess is a pocket of pus. You can get an abscess almost anywhere in your body. When an area of your body becomes infected, your body's immune system tries to fight the infection. White blood cells go to the infected area, collect within the damaged tissue, and cause inflammation. During this process, pus forms.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement K61.39 replaces the following previously assigned code(s):

  • K61.3 - Ischiorectal abscess
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K61.39Overview

What is the ICD-10 code for other ischiorectal abscess?

The ICD-10-CM code for other ischiorectal abscess is K61.39 (sometimes written as K6139). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is K61.39 (Ischiorectal abscess) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other ischiorectal abscess on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does K61.39 group to?

When other ischiorectal abscess is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 394, 395, 393, with relative weights from 0.6379 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.