Specific code 2012 ICD-9-CM Diagnosis Code 540.1
Acute appendicitis with peritoneal abscess
  • Short description: Abscess of appendix.
  • ICD-9-CM 540.1 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 540.1 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
  • You are viewing the 2012 version of ICD-9-CM 540.1.
  • More recent version(s) of ICD-9-CM 540.1: 2013 2014.
Disease Synonyms
  • Acute appendicitis w peritoneal abscess
Applies To
  • Abscess of appendix
    • With generalized peritonitis
Convert to ICD-10-CM: 540.1 converts approximately to:
  • 2014 ICD-10-CM K35.3 Acute appendicitis with localized peritonitis
ICD-9-CM Volume 2 Index entries containing back-references to 540.1:
  • Abscess (acute) (chronic) (infectional) (lymphangitic) (metastatic) (multiple) (pyogenic) (septic) (with lymphangitis) (see also Cellulitis) 682.9
    • appendix 540.1
    • cecum 569.5
      • with appendicitis 540.1
    • ileocecal 540.1
    • iliac (region) 682.2
      • fossa 540.1
    • periappendiceal 540.1
    • pericecal 540.1
    • peritoneum, peritoneal (perforated) (ruptured) 567.22
      • with
        • abortion - see Abortion, by type, with sepsis
        • appendicitis 540.1
        • ectopic pregnancy (see also categories 633.0-633.9) 639.0
        • molar pregnancy (see also categories 630-632) 639.0
      • following
      • pelvic, female (see also Disease, pelvis, inflammatory) 614.4
      • postoperative 998.59
      • puerperal, postpartum, childbirth 670.8
      • tuberculous (see also Tuberculosis) 014.0
    • perityphlic 540.1
    • postcecal 540.1
    • subcecal 540.1
    • vermiform appendix 540.1
  • Appendicitis 541
    • with
      • perforation, peritonitis (generalized), or rupture 540.0
        • with peritoneal abscess 540.1
      • peritoneal abscess 540.1
    • acute (catarrhal) (fulminating) (gangrenous) (inflammatory) (obstructive) (retrocecal) (suppurative) 540.9
      • with
        • perforation, peritonitis, or rupture 540.0
          • with peritoneal abscess 540.1
        • peritoneal abscess 540.1
  • Perforation, perforative (nontraumatic)
    • appendix 540.0
      • with peritoneal abscess 540.1
    • cecum 540.0
      • with peritoneal abscess 540.1
  • Peritonitis (acute) (adhesive) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) 567.9
    • with or following
      • abortion - see Abortion, by type, with sepsis
      • abscess 567.21
      • appendicitis 540.0
        • with peritoneal abscess 540.1
      • ectopic pregnancy (see also categories 633.0-633.9) 639.0
      • molar pregnancy (see also categories 630-632) 639.0
  • Phlegmon (see also Abscess) 682.9
  • Rupture, ruptured 553.9
    • appendix (with peritonitis) 540.0
      • with peritoneal abscess 540.1
      • traumatic - see Injury, internal, gastrointestinal tract
    • cecum (with peritonitis) 540.0
      • with peritoneal abscess 540.1
      • traumatic 863.89
        • with open wound into cavity 863.99
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 540.1 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2012 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.