1. ICD-10-CM Codes
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2. K00-K95 Diseases of the digestive system
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3. K35-K38 Diseases of appendix
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4. K35- Acute appendicitis
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2018 ICD-10-CM Diagnosis Code K35.3

Acute appendicitis with localized peritonitis

2016 2017 2018 Billable/Specific Code

• K35.3 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2018 edition of ICD-10-CM K35.3 became effective on October 1, 2017.
• This is the American ICD-10-CM version of K35.3 - other international versions of ICD-10 K35.3 may differ.

• Acute appendicitis with peritoneal abscess
• Localized peritonitis due to acute appendicitis

• 338 Appendectomy with complicated principal diagnosis with mcc
• 339 Appendectomy with complicated principal diagnosis with cc
• 340 Appendectomy with complicated principal diagnosis without cc/mcc
• 341 Appendectomy without complicated principal diagnosis with mcc
• 342 Appendectomy without complicated principal diagnosis with cc
• 343 Appendectomy without complicated principal diagnosis without cc/mcc
• 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

Convert K35.3 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

• Type 1 Excludes: K37
  ICD-10-CM Diagnosis Code K37

  Unspecified appendicitis

  2016 2017 2018 Billable/Specific Code

  Type 1 Excludes

  • -unspecified appendicitis with peritonitis (K35.2-K35.3)
• Type 2 Excludes: K63.0
  , K63.1
  ICD-10-CM Diagnosis Code K63.0

  Abscess of intestine

  2016 2017 2018 Billable/Specific Code

  Type 1 Excludes

  • abscess of intestine with Crohn's disease (K50.014, K50.114, K50.814, K50.914,)
  • abscess of intestine with diverticular disease (K57.0, K57.2, K57.4, K57.8)
  • abscess of intestine with ulcerative colitis (K51.014, K51.214, K51.314, K51.414, K51.514, K51.814, K51.914)

  Type 2 Excludes

  • abscess of anal and rectal regions (K61.-)
  • abscess of appendix (K35.3)
  ICD-10-CM Diagnosis Code K63.1

  Perforation of intestine (nontraumatic)

  2016 2017 2018 Billable/Specific Code

  Applicable To

  • Perforation (nontraumatic) of rectum

  Type 1 Excludes

  • perforation (nontraumatic) of duodenum (K26.-)
  • perforation (nontraumatic) of intestine with diverticular disease (K57.0, K57.2, K57.4, K57.8)

  Type 2 Excludes

  • perforation (nontraumatic) of appendix (K35.2, K35.3)

• 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 Billable/Specific Code
  • iliac (region) L02.214
    ICD-10-CM Diagnosis Code L02.214

    Cutaneous abscess of groin

    2016 2017 2018 Billable/Specific Code
    • fossa K35.3
  • peritoneum, peritoneal (perforated) (ruptured) K65.1
    ICD-10-CM Diagnosis Code K65.1

    Peritoneal abscess

    2016 2017 2018 Billable/Specific Code

    Applicable To

    • Abdominopelvic abscess
    • Abscess (of) omentum
    • Abscess (of) peritoneum
    • Mesenteric abscess
    • Retrocecal abscess
    • Subdiaphragmatic abscess
    • Subhepatic abscess
    • Subphrenic abscess
    • with appendicitis K35.3
  • appendix K35.3
  • cecum K35.3
  • ileocecal K35.3
  • periappendicular K35.3
  • pericecal K35.3
  • perityphlic K35.3
  • postcecal K35.3
  • subcecal K35.3
  • vermiform appendix K35.3
• Appendicitis (pneumococcal) (retrocecal) K37
  ICD-10-CM Diagnosis Code K37

  Unspecified appendicitis

  2016 2017 2018 Billable/Specific Code

  Type 1 Excludes

  • -unspecified appendicitis with peritonitis (K35.2-K35.3)
  • with
    • peritonitis NEC K35.3
      • localized K35.3 (with perforation or rupture)
    • peritoneal abscess K35.3
  • acute (catarrhal) (fulminating) (gangrenous) (obstructive) (retrocecal) (suppurative) K35.80
    ICD-10-CM Diagnosis Code K35.80

    Unspecified acute appendicitis

    2016 2017 2018 Billable/Specific Code

    Applicable To

    • Acute appendicitis NOS
    • Acute appendicitis without (localized) (generalized) peritonitis
    • with
      • peritonitis NEC K35.3
        • localized K35.3 (with perforation or rupture)
      • peritoneal abscess K35.3
• Gangrene, gangrenous (connective tissue) (dropsical) (dry) (moist) (skin) (ulcer) I96
  - see also Necrosis
  ICD-10-CM Diagnosis Code I96

  Gangrene, not elsewhere classified

  2016 2017 2018 Billable/Specific Code

  Applicable To

  • Gangrenous cellulitis

  Type 1 Excludes

  • gangrene in atherosclerosis of native arteries of the extremities (I70.26)
  • gangrene in hernia (K40.1, K40.4, K41.1, K41.4, K42.1, K43.1-, K44.1, K45.1, K46.1)
  • gangrene in other peripheral vascular diseases (I73.-)
  • gangrene of certain specified sites - see Alphabetical Index
  • gas gangrene (A48.0)
  • pyoderma gangrenosum (L88)

  Type 2 Excludes

  • gangrene in diabetes mellitus (E08-E13 with .52)
  • appendix K35.80
    ICD-10-CM Diagnosis Code K35.80

    Unspecified acute appendicitis

    2016 2017 2018 Billable/Specific Code

    Applicable To

    • Acute appendicitis NOS
    • Acute appendicitis without (localized) (generalized) peritonitis
    • with
      • peritonitis NEC K35.3
        • localized K35.3 (with perforation or rupture)
      • peritoneal abscess K35.3
• Perforation, perforated (nontraumatic) (of)
  • appendix K35.2
    ICD-10-CM Diagnosis Code K35.2

    Acute appendicitis with generalized peritonitis

    2016 2017 2018 Billable/Specific Code

    Applicable To

    • Appendicitis (acute) with generalized (diffuse) peritonitis following rupture or perforation of appendix
    • Perforated appendix NOS
    • Ruptured appendix NOS
    • with localized peritonitis K35.3
  • cecum K35.2
    ICD-10-CM Diagnosis Code K35.2

    Acute appendicitis with generalized peritonitis

    2016 2017 2018 Billable/Specific Code

    Applicable To

    • Appendicitis (acute) with generalized (diffuse) peritonitis following rupture or perforation of appendix
    • Perforated appendix NOS
    • Ruptured appendix NOS
    • with localized peritonitis K35.3
• 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 Billable/Specific Code

  Applicable To

  • Bacterial peritonitis NOS
  • with or following
    • appendicitis K35.3
      • localized K35.3
• Rupture, ruptured
  • appendix (with peritonitis) K35.2
    ICD-10-CM Diagnosis Code K35.2

    Acute appendicitis with generalized peritonitis

    2016 2017 2018 Billable/Specific Code

    Applicable To

    • Appendicitis (acute) with generalized (diffuse) peritonitis following rupture or perforation of appendix
    • Perforated appendix NOS
    • Ruptured appendix NOS
    • with localized peritonitis K35.3
  • cecum (with peritonitis) K65.0
    ICD-10-CM Diagnosis Code K65.0

    Generalized (acute) peritonitis

    2016 2017 2018 Billable/Specific Code

    Applicable To

    • Pelvic peritonitis (acute), male
    • Subphrenic peritonitis (acute)
    • Suppurative peritonitis (acute)
    • with peritoneal abscess K35.3

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