K35.3 – Acute appendicitis with localized peritonitis
ICD-10-CM 2027 diagnosis code · Diseases of appendix
ICD-10-CM code
K35.3
- Code
K35.3(claims format:K353)- Description
- Acute appendicitis with localized peritonitis
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 11. Diseases of the digestive system (K00-K95)
- Block
- K35-K38 Diseases of appendix
- Parent codes
- K35
Billable codes under K35.3
K35.3 is a header code and cannot be used on claims. Choose the most specific code:
- K35.30 – Acute appendicitis with localized peritonitis, without perforation or gangreneBillable
- K35.31 – Acute appendicitis with localized peritonitis and gangrene, without perforationBillable
- K35.32 – Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscessBillable
- K35.33 – Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscessBillable
Related codes in K35
Frequently asked questions
What is ICD-10 code K35.3?
K35.3 is the ICD-10-CM code for acute appendicitis with localized peritonitis, in the block K35-K38 (Diseases of appendix).
Is K35.3 a billable code?
No. K35.3 is a header code with more specific child codes; report one of the billable codes listed above.
What category does K35.3 belong to?
It belongs to category K35 – Acute appendicitis.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.