2021 ICD-10-CM Diagnosis Code K65.1

Peritoneal abscess

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • K65.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM K65.1 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of K65.1 - other international versions of ICD-10 K65.1 may differ.
Applicable To
  • Abdominopelvic abscess
  • Abscess (of) omentum
  • Abscess (of) peritoneum
  • Mesenteric abscess
  • Retrocecal abscess
  • Subdiaphragmatic abscess
  • Subhepatic abscess
  • Subphrenic abscess
The following code(s) above K65.1 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 K65.1:
  • K00-K95
    2021 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
  • K65
    ICD-10-CM Diagnosis Code K65

    Peritonitis

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Code Also
    • if applicable diverticular disease of intestine (K57.-)
    Type 1 Excludes
    • acute appendicitis with generalized peritonitis (K35.2-)
    • aseptic peritonitis (T81.6)
    • benign paroxysmal peritonitis (E85.0)
    • chemical peritonitis (T81.6)
    • gonococcal peritonitis (A54.85)
    • neonatal peritonitis (P78.0-P78.1)
    • pelvic peritonitis, female (N73.3-N73.5)
    • periodic familial peritonitis (E85.0)
    • peritonitis due to talc or other foreign substance (T81.6)
    • peritonitis in chlamydia (A74.81)
    • peritonitis in diphtheria (A36.89)
    • peritonitis in syphilis (late) (A52.74)
    • peritonitis in tuberculosis (A18.31)
    • peritonitis with or following abortion or ectopic or molar pregnancy (O00-O07, O08.0)
    • peritonitis with or following appendicitis (K35.-)
    • puerperal peritonitis (O85)
    • retroperitoneal infections (K68.-)
    Use Additional
    • code (B95-B97), to identify infectious agent, if known
    Peritonitis
Approximate Synonyms
  • Abdominal abscess
  • Abdominopelvic abscess
  • Abscess of omentum
  • Abscess of peritoneum
  • Abscess, abdominal
  • Abscess, abdominal- pelvic
  • Abscess, mesenteric
  • Abscess, mid-abdominal
  • Abscess, omentum
  • Abscess, peritoneal
  • Abscess, retrocecal
  • Abscess, subdiaphragmatic (under diaphragm)
  • Abscess, subhepatic (under liver)
  • Acute male pelvic abscess
  • Acute male pelvis abscess
  • Intra abdominal abscess after procedure
  • Mesenteric abscess
  • Midabdominal abscess
  • Postprocedural intraabdominal abscess
  • Postprocedural subphrenic abscess
  • Retrocecal abscess
  • Subdiaphragmatic abscess
  • Subhepatic abscess
  • Subphrenic abscess after procedure
Clinical Information
  • Accumulation of purulent exudates beneath the diaphragm, also known as upper abdominal abscess. It is usually associated with peritonitis or postoperative infections.
ICD-10-CM K65.1 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 371 Major gastrointestinal disorders and peritoneal infections with mcc
  • 372 Major gastrointestinal disorders and peritoneal infections with cc
  • 373 Major gastrointestinal disorders and peritoneal infections without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems

Convert K65.1 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
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to K65.1:
  • 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 2021 Billable/Specific Code
  • Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) K65.9
    ICD-10-CM Diagnosis Code K65.9

    Peritonitis, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Bacterial peritonitis NOS
  • Sepsis (generalized) (unspecified organism) A41.9
    ICD-10-CM Diagnosis Code A41.9

    Sepsis, unspecified organism

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Septicemia NOS
    • intra-abdominal K65.1

ICD-10-CM Codes Adjacent To K65.1
K64.0 First degree hemorrhoids
K64.1 Second degree hemorrhoids
K64.2 Third degree hemorrhoids
K64.3 Fourth degree hemorrhoids
K64.4 Residual hemorrhoidal skin tags
K64.5 Perianal venous thrombosis
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

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