K61.3 ICD-10-CM Code: Ischiorectal abscess

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for K61.3 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on K61.3 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for K61.3

MedCoder structured workflow — derived from this code’s own official record

Before you code K61.3

1. K61.3 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

   ReviewK61.31, K61.39

   See the relationships section · Guide: How to choose an ICD-10-CM code →

Choose the right path

1. Does the documentation support one of the more specific codes beneath K61.3?
   Yes → Select that code and continue the checks below on its own page.
   No → K61.3 cannot be reported as written; query for the specificity its subcategory needs.

   ReviewK61.31, K61.39

Consider K61.3. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement

Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Verify Before Coding

• Not billable as written — a more specific code is required: K61.31, K61.39.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name K61.3 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 5 Excludes2 notes across 2 chapters: K60 — Fissure and fistula of anal and rectal regions (via K61.-), K63.0 — Abscess of intestine (via K61.-), L02 — Cutaneous abscess, furuncle and carbuncle (via K61.-), L03 — Cellulitis and acute lymphangitis (via K61.-), L03.31 — Cellulitis of trunk (via K61.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Clinical classification (AHRQ CCSR):DIG016 — Peritonitis and intra-abdominal abscess (default); DIG015 — Anal and rectal conditions.

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical categories (Peritonitis and intra-abdominal abscess, Anal and rectal conditions).

K60.512 — Anorectal fistula, simple, persistent, K60.513 — Anorectal fistula, simple, recurrent, K60.519 — Anorectal fistula, simple, unspecified, K60.521 — Anorectal fistula, complex, initial, K60.522 — Anorectal fistula, complex, persistent, K60.523 — Anorectal fistula, complex, recurrent, K60.529 — Anorectal fistula, complex, unspecified, K61.0 — Anal abscess, K61.1 — Rectal abscess, K61.2 — Anorectal abscess, K61.31 — Horseshoe abscess, K61.39 — Other ischiorectal abscess, K61.4 — Intrasphincteric abscess, K61.5 — Supralevator abscess, K62.0 — Anal polyp, K62.1 — Rectal polyp, K62.2 — Anal prolapse, K62.3 — Rectal prolapse, K62.4 — Stenosis of anus and rectum, K62.6 — Ulcer of anus and rectum, +83 more

Contextual Map

Every relationship of K61.3 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run K61.3 with these 5 related codes in Claim Check

Hierarchy

• K00-K95 — Chapter 11: Diseases of the Digestive System (K00-K95) (K00-K95)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• K55-K64 — Other diseases of intestines[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes2 notes

• K60 — Fissure and fistula of anal and rectal regions[Excludes2](via K61.-): “abscess or cellulitis of anal and rectal regions (K61.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• K63.0 — Abscess of intestine[Excludes2](via K61.-): “abscess of anal and rectal regions (K61.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• L02 — Cutaneous abscess, furuncle and carbuncle[Excludes2](via K61.-): “abscess of anus and rectal regions (K61.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• L03 — Cellulitis and acute lymphangitis[Excludes2](via K61.-): “cellulitis of anal and rectal region (K61.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• L03.31 — Cellulitis of trunk[Excludes2](via K61.-): “cellulitis of anal and rectal regions (K61.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• DIG016 — Peritonitis and intra-abdominal abscess[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)
• DIG015 — Anal and rectal conditions[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

Nearest codes

• K61 — Abscess of anal and rectal regions[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• K61.0 — Anal abscess[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• K61.1 — Rectal abscess[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• K61.2 — Anorectal abscess[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• K61.31 — Horseshoe abscess[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• K61.39 — Other ischiorectal abscess[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• K61.4 — Intrasphincteric abscess[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• K61.5 — Supralevator abscess[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Change history (2)

• FY2019 — Became a non-billable header[Change history]— CMS release files (code change ledger) · icd10cm-fy2019
• and 1 more

Common coding questions

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data

CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to K61.3 in its code family, with their registry titles.

• K61 — Abscess of anal and rectal regions
• K61.0 — Anal abscess
• K61.1 — Rectal abscess
• K61.2 — Anorectal abscess
• K61.31 — Horseshoe abscess
• K61.39 — Other ischiorectal abscess
• K61.4 — Intrasphincteric abscess
• K61.5 — Supralevator abscess

View all codes in the K61 family