1. ICD-10-CM Codes
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2. K00-K95 Diseases of the digestive system
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3. K65-K68 Diseases of peritoneum and retroperitoneum
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4. K65- Peritonitis
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5. 2021 ICD-10-CM Diagnosis Code K65.8

2021 ICD-10-CM Diagnosis Code K65.8

Other peritonitis

2016 2017 2018 2019 2020 2021 Billable/Specific Code

• K65.8 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 K65.8 became effective on October 1, 2020.
• This is the American ICD-10-CM version of K65.8 - other international versions of ICD-10 K65.8 may differ.

• Chronic peritonitis
• Chronic proliferative peritonitis
• Mesenteric saponification
• Peritonitis after surgery
• Peritonitis due to infected dialysis catheter
• Peritonitis due to infected peritoneal dialysis catheter
• Peritonitis due to urine
• Peritonitis, chronic
• Peritonitis, chronic proliferative
• Peritonitis, pneumococcal
• Pneumococcal peritonitis
• Postoperative peritonitis
• Urine peritonitis

• 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 K65.8 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

• Capsulitis (joint) - see also Enthesopathy
  • hepatic K65.8
• Cecitis K52.9
  ICD-10-CM Diagnosis Code K52.9

  Noninfective gastroenteritis and colitis, unspecified

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Applicable To

  • Colitis NOS
  • Enteritis NOS
  • Gastroenteritis NOS
  • Ileitis NOS
  • Jejunitis NOS
  • Sigmoiditis NOS

  Type 1 Excludes

  • diarrhea NOS (R19.7)
  • functional diarrhea (K59.1)
  • infectious gastroenteritis and colitis NOS (A09)
  • neonatal diarrhea (noninfective) (P78.3)
  • psychogenic diarrhea (F45.8)
  • with perforation, peritonitis, or rupture K65.8
• Perihepatitis K65.8
• 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
  • due to
    • urine K65.8
  • eosinophilic K65.8
  • chronic proliferative K65.8
  • proliferative, chronic K65.8
  • specified NEC K65.8
  • urine K65.8
• Saponification, mesenteric K65.8
• Serositis, multiple K65.8
  • peritoneal K65.8

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