2020 ICD-10-CM Diagnosis Code K66

Other disorders of peritoneum

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • K66 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM K66 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of K66 - other international versions of ICD-10 K66 may differ.
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (K66) and the excluded code together.
  • ascites (
    ICD-10-CM Diagnosis Code R18
    R18.-
    )
  • peritoneal effusion (chronic) (
    ICD-10-CM Diagnosis Code R18.8

    Other ascites

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Ascites NOS
    • Peritoneal effusion (chronic)
    R18.8
    )
The following code(s) above K66 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 K66:
  • 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
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
ICD-10-CM Codes Adjacent To K66
K64.8 Other hemorrhoids
K64.9 Unspecified hemorrhoids
K65 Peritonitis
K65.0 Generalized (acute) peritonitis
K65.1 Peritoneal abscess
K65.2 Spontaneous bacterial peritonitis
K65.3 Choleperitonitis
K65.4 Sclerosing mesenteritis
K65.8 Other peritonitis
K65.9 Peritonitis, unspecified
K66 Other disorders of peritoneum
K66.0 Peritoneal adhesions (postprocedural) (postinfection)
K66.1 Hemoperitoneum
K66.8 Other specified disorders of peritoneum
K66.9 Disorder of peritoneum, unspecified
K67 Disorders of peritoneum in infectious diseases classified elsewhere
K68 Disorders of retroperitoneum
K68.1 Retroperitoneal abscess
K68.11 Postprocedural retroperitoneal abscess
K68.12 Psoas muscle abscess
K68.19 Other retroperitoneal abscess

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