2024 ICD-10-CM Diagnosis Code A18.31

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Tuberculous peritonitis

  • A18.31 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2024 edition of ICD-10-CM A18.31 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of A18.31 – other international versions of ICD-10 A18.31 may differ.

Applicable To

  • Tuberculous ascites

The following code(s) above A18.31 contain annotation back-references

 that may be applicable to A18.31:

  • A00-B99  Certain infectious and parasitic diseases
  • A15-A19  Tuberculosis

Approximate Synonyms

  • Tuberculosis (tb) peritonitis

Clinical Information

  • A form of peritonitis seen in patients with tuberculosis, characterized by lesion either as a miliary form or as a pelvic mass on the peritoneal surfaces. Most patients have ascites, abdominal swelling, abdominal pain, and other systemic symptoms such as fever; weight loss; and anemia.

ICD-10-CM A18.31 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

  • 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
  • 974 Hiv with major related condition with mcc
  • 975 Hiv with major related condition with cc
  • 976 Hiv with major related condition without cc/mcc

Convert A18.31 to ICD-9-CMCode 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
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change

Code annotations containing back-references to A18.31:

Diagnosis Index entries containing back-references to A18.31:

  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) L02.91
  • Ascites (abdominal) R18.8
    • tuberculous A18.31
  • Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) K65.9
    • fibrocaseous A18.31 (tuberculous)
    • tuberculous A18.31
  • Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
    • abscess (respiratory) A15.9
      • subdiaphragmatic A18.31
    • ascites A18.31
    • omentum A18.31
    • peritoneum NEC A18.31
    • peritonitis A18.31