Diseases of appendix
29 codes in this section
About Section K35-K38
Section K35-K38 (K35-K38) covers diseases of appendix. It sits within the Diseases of the digestive system chapter (K00-K95). This section contains 29 ICD-10-CM codes, 21 billable diagnoses you can submit on a claim, and 8 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in K35-K38
Grouped by 3-character root code. Click any code for full detail.
| K35.2 | Acute appendicitis with generalized peritonitis | Header |
| K35.20 | Acute appendicitis with generalized peritonitis, without abscess | Header |
| K35.200 | Acute appendicitis with generalized peritonitis, without perforation or abscess | Billable |
| K35.201 | Acute appendicitis with generalized peritonitis, with perforation, without abscess | Billable |
| K35.209 | Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation | Billable |
| K35.21 | Acute appendicitis with generalized peritonitis, with abscess | Header |
| K35.210 | Acute appendicitis with generalized peritonitis, without perforation, with abscess | Billable |
| K35.211 | Acute appendicitis with generalized peritonitis, with perforation and abscess | Billable |
| K35.219 | Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation | Billable |
| K35.3 | Acute appendicitis with localized peritonitis | Header |
| K35.30 | Acute appendicitis with localized peritonitis, without perforation or gangrene | Billable |
| K35.31 | Acute appendicitis with localized peritonitis and gangrene, without perforation | Billable |
| K35.32 | Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess | Billable |
| K35.33 | Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess | Billable |
| K35.8 | Other and unspecified acute appendicitis | Header |
| K35.80 | Unspecified acute appendicitis | Billable |
| K35.89 | Other acute appendicitis | Header |
| K35.890 | Other acute appendicitis without perforation or gangrene | Billable |
| K35.891 | Other acute appendicitis without perforation, with gangrene | Billable |
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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