2020 ICD-10-CM Diagnosis Code K61.1

Rectal abscess

    2016 2017 2018 2019 2020 Billable/Specific Code
  • K61.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM K61.1 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of K61.1 - other international versions of ICD-10 K61.1 may differ.
Applicable To
  • Perirectal abscess
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as K61.1. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • ischiorectal abscess (
    ICD-10-CM Diagnosis Code K61.39

    Other ischiorectal abscess

      2019 - New Code 2020 Billable/Specific Code
    Applicable To
    • Abscess of ischiorectal fossa
    • Ischiorectal abscess, NOS
    K61.39
    )
The following code(s) above K61.1 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to K61.1:
  • K00-K95
    2020 ICD-10-CM Range K00-K95

    Diseases of the digestive system

    Type 2 Excludes
    • 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)
    Diseases of the digestive system
  • K61
    ICD-10-CM Diagnosis Code K61

    Abscess of anal and rectal regions

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Includes
    • abscess of anal and rectal regions
    • cellulitis of anal and rectal regions
    Abscess of anal and rectal regions
Approximate Synonyms
  • Perirectal abscess
  • Perirectal cellulitis
ICD-10-CM K61.1 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 393 Other digestive system diagnoses with mcc
  • 394 Other digestive system diagnoses with cc
  • 395 Other digestive system diagnoses without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems

Convert K61.1 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to K61.1:
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) L02.91
    ICD-10-CM Diagnosis Code L02.91

    Cutaneous abscess, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative) L03.90
    ICD-10-CM Diagnosis Code L03.90

    Cellulitis, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    • perirectal K61.1
    • rectum K61.1

ICD-10-CM Codes Adjacent To K61.1
K59.9 Functional intestinal disorder, unspecified
K60 Fissure and fistula of anal and rectal regions
K60.0 Acute anal fissure
K60.1 Chronic anal fissure
K60.2 Anal fissure, unspecified
K60.3 Anal fistula
K60.4 Rectal fistula
K60.5 Anorectal fistula
K61 Abscess of anal and rectal regions
K61.0 Anal abscess
K61.1 Rectal abscess
K61.2 Anorectal abscess
K61.3 Ischiorectal abscess
K61.31 Horseshoe abscess
K61.39 Other ischiorectal abscess
K61.4 Intrasphincteric abscess
K61.5 Supralevator abscess
K62 Other diseases of anus and rectum
K62.0 Anal polyp
K62.1 Rectal polyp
K62.2 Anal prolapse

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.