1. ICD-10-CM Codes
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2. K00-K95
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3. K65-K68
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4. K65-
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5. 2023 ICD-10-CM Diagnosis Code K65.9

2023 ICD-10-CM Diagnosis Code K65.9

Peritonitis, unspecified

2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

• K65.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2023 edition of ICD-10-CM K65.9 became effective on October 1, 2022.
• This is the American ICD-10-CM version of K65.9 - other international versions of ICD-10 K65.9 may differ.

• Epiploic appendagitis
• Fibrinous peritonitis
• Infectious peritonitis
• Peritoneal dialysis-associated peritonitis
• Peritonitis
• Peritonitis due to infected dialysis catheter
• Peritonitis due to infected peritoneal dialysis catheter
• Peritonitis due to peritoneal dialysis
• Peritonitis, fibrinous
• Peritonitis, infectious

• Inflammation of the peritoneum (tissue that lines the abdominal wall and covers most of the organs in the abdomen). Peritonitis can result from infection, injury, or certain diseases. Symptoms may include swelling of the abdomen, severe pain, and weight loss.
• Inflammation of the peritoneum due to infection by bacteria or fungi. Causes include liver disease, perforation of the gastrointestinal tract or biliary tract, and peritoneal dialysis. Patients usually present with abdominal pain and tenderness, fever, chills, and nausea and vomiting. It is an emergency medical condition that requires prompt medical attention and treatment.
• Inflammation of the peritoneum lining the abdominal cavity as the result of infectious, autoimmune, or chemical processes. Primary peritonitis is due to infection of the peritoneal cavity via hematogenous or lymphatic spread and without intra-abdominal source. Secondary peritonitis arises from the abdominal cavity itself through rupture or abscess of intra-abdominal organs.
• Inflammation of the peritoneum, a condition marked by exudations in the peritoneum of serum, fibrin, cells, and pus.
• Inflammation of the thin membrane surrounding abdominal cavity, called peritoneum

• 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 K65.9 to ICD-9-CM

• 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
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change

• Type 1 Excludes: K65.2
  ICD-10-CM Diagnosis Code K65.2

  Spontaneous bacterial peritonitis

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

  Type 1 Excludes

  • bacterial peritonitis NOS (K65.9)

• Fistula (cutaneous) L98.8
  ICD-10-CM Diagnosis Code L98.8

  Other specified disorders of the skin and subcutaneous tissue

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • peritoneum K65.9
• Hemoperitoneum K66.1
  ICD-10-CM Diagnosis Code K66.1

  Hemoperitoneum

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

  Type 1 Excludes

  • traumatic hemoperitoneum (S36.8-)
  • infectional K65.9
• Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) K65.9

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