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ICD-10-CM Codes
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K00-K95
Diseases of the digestive system
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K35-K38
Diseases of appendix
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K35-
Acute appendicitis
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2021 ICD-10-CM Diagnosis Code K35.33
2021 ICD-10-CM Diagnosis Code K35.33
Acute appendicitis with perforation and localized peritonitis, with abscess
2019 - New Code 2020 2021 Billable/Specific Code
- K35.33 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- Short description: Acute appendicitis with perf and loc peritonitis, with abscs
- The 2021 edition of ICD-10-CM K35.33 became effective on October 1, 2020.
- This is the American ICD-10-CM version of K35.33 - other international versions of ICD-10 K35.33 may differ.
Applicable To- (Acute) appendicitis with (peritoneal) abscess NOS
- Ruptured appendix with localized peritonitis and abscess
The following code(s) above
K35.33 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
- Applicable To annotations, or
- Code Also annotations, or
- Code First annotations, or
- Excludes1 annotations, or
- Excludes2 annotations, or
- Includes annotations, or
- Note annotations, or
- Use Additional annotations
that may be applicable to
K35.33:
ICD-10-CM K35.33 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
- 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
- 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
Code History
- 2019 (effective 10/1/2018): New code
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
- 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 2019 2020 2021 Billable/Specific Code
- iliac (region) L02.214
ICD-10-CM Diagnosis Code L02.214
Cutaneous abscess of groin
2016 2017 2018 2019 2020 2021 Billable/Specific Code
- peritoneum, peritoneal (perforated) (ruptured) K65.1
ICD-10-CM Diagnosis Code K65.1
Peritoneal abscess
2016 2017 2018 2019 2020 2021 Billable/Specific Code
Applicable To- Abdominopelvic abscess
- Abscess (of) omentum
- Abscess (of) peritoneum
- Mesenteric abscess
- Retrocecal abscess
- Subdiaphragmatic abscess
- Subhepatic abscess
- Subphrenic abscess
- appendix K35.33
- cecum K35.33
- ileocecal K35.33
- periappendicular K35.33
- pericecal K35.33
- perityphlic K35.33
- postcecal K35.33
- subcecal K35.33
- vermiform appendix K35.33
- Appendicitis (pneumococcal) (retrocecal) K37
ICD-10-CM Diagnosis Code K37
Unspecified appendicitis
2016 2017 2018 2019 2020 2021 Billable/Specific Code
- with
- peritonitis NEC K35.33
- localized K35.30
ICD-10-CM Diagnosis Code K35.30
Acute appendicitis with localized peritonitis, without perforation or gangrene
2019 - New Code 2020 2021 Billable/Specific Code
Applicable To- Acute appendicitis with localized peritonitis NOS
- with
- perforation K35.32
ICD-10-CM Diagnosis Code K35.32
Acute appendicitis with perforation and localized peritonitis, without abscess
2019 - New Code 2020 2021 Billable/Specific Code
Applicable To- (Acute) appendicitis with perforation NOS
- Perforated appendix NOS
- Ruptured appendix (with localized peritonitis) NOS
- peritoneal abscess K35.33
- acute (catarrhal) (fulminating) (gangrenous) (obstructive) (retrocecal) (suppurative) K35.80
ICD-10-CM Diagnosis Code K35.80
Unspecified acute appendicitis
2016 2017 2018 2019 2020 2021 Billable/Specific Code
Applicable To- Acute appendicitis NOS
- Acute appendicitis without (localized) (generalized) peritonitis
- with
- peritonitis NEC K35.33
- localized K35.30
ICD-10-CM Diagnosis Code K35.30
Acute appendicitis with localized peritonitis, without perforation or gangrene
2019 - New Code 2020 2021 Billable/Specific Code
Applicable To- Acute appendicitis with localized peritonitis NOS
- with
- perforation K35.32
ICD-10-CM Diagnosis Code K35.32
Acute appendicitis with perforation and localized peritonitis, without abscess
2019 - New Code 2020 2021 Billable/Specific Code
Applicable To- (Acute) appendicitis with perforation NOS
- Perforated appendix NOS
- Ruptured appendix (with localized peritonitis) NOS
- peritoneal abscess K35.33
- Rupture, ruptured
- cecum (with peritonitis) K65.0
ICD-10-CM Diagnosis Code K65.0
Generalized (acute) peritonitis
2016 2017 2018 2019 2020 2021 Billable/Specific Code
Applicable To- Pelvic peritonitis (acute), male
- Subphrenic peritonitis (acute)
- Suppurative peritonitis (acute)
- with peritoneal abscess K35.33
ICD-10-CM Codes Adjacent To K35.33
K31.89 Other diseases of stomach and duodenum
K31.9 Disease of stomach and duodenum, unspecified
K35.2 Acute appendicitis with generalized peritonitis
K35.3 Acute appendicitis with localized peritonitis
K35.30 …… without perforation or gangrene
K35.31 …… and gangrene, without perforation
K35.32 Acute appendicitis with perforation and localized peritonitis, without abscess
K35.33
Acute appendicitis with perforation and localized peritonitis, with abscess
K35.8 Other and unspecified acute appendicitis
K35.80 Unspecified acute appendicitis
K35.89 Other acute appendicitis
K35.890 …… without perforation or gangrene
K35.891 …… without perforation, with gangrene
K37 Unspecified appendicitis
K38 Other diseases of appendix
K38.0 Hyperplasia of appendix
K38.1 Appendicular concretions
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.