2027 ICD-10-CM Diagnosis Code K61.0Anal abscess
ICD-10-CM Codes›K00–K95›K55-K64›K61
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
K61.0 is a billable ICD-10-CM diagnosis code for anal 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. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 7 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Anal and rectal conditions and Peritonitis and intra-abdominal abscess.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anal abscess
- Anal abscess drained
- Anal cellulitis
- Anal furunculosis
- Anogenital streptococcal cellulitis of infancy and childhood
- Anorectal abscess
- Carbuncle of anus
- Carbuncle of perineum
- Cellulitis - anus or rectum
- Cellulitis of perineum
- Childhood cellulitis of perianal region caused by beta-hemolytic Streptococcus group A
- Furuncle of anus
- Furuncle of perineum
- Perianal abscess
- Perianal cellulitis
- Perianal dermatitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to K61.0: 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.
- 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.
- Perianal abscess
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.
- intrasphincteric abscess (K61.4)
- 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 K61.0, its category, or a range that includes it.
Excludes2 5
These codes carry an Excludes2 note naming K61.0: 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 regionsabscess or cellulitis of anal and rectal regions (K61.-) names K61.-, which includes this code
- K63.0 Abscess of intestineabscess of anal and rectal regions (K61.-) names K61.-, which includes this code
- L02 Cutaneous abscess, furuncle and carbuncleabscess of anus and rectal regions (K61.-) names K61.-, which includes this code
- L03 Cellulitis and acute lymphangitiscellulitis of anal and rectal region (K61.-) names K61.-, which includes this code
- L03.31 Cellulitis of trunkcellulitis 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.
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.
Convert K61.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K61.0Overview
What is the ICD-10 code for anal abscess?
The ICD-10-CM code for anal abscess is K61.0 (sometimes written as K610). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is K61.0 (Abscess of anal and rectal regions) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report anal abscess on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does K61.0 group to?
When anal 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.
Is K61.0 a CC or MCC?
CMS lists K61.0 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 7 closely related codes in its exclusion list.
What is the ICD-9 equivalent of K61.0?
Under the General Equivalence Mappings, anal abscess converts to ICD-9-CM 566 (anal & rectal abscess). The mapping is approximate, so confirm the match fits the documentation.
