K35.209 – Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation

ICD-10-CM 2027 diagnosis code · Diseases of appendix

Billable code

ICD-10-CM code K35.209

Code: K35.209 (claims format: K35209)
Description: Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation
Short description: Ac appendicitis w gen peritonitis,w/o abscs,unsp as to perf
Billable: Yes – valid for HIPAA-covered transactions
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 › K35.2 › K35.20

Notes for K35.209

Applicable to:

(Acute) appendicitis with generalized peritonitis NOS

Index terms for K35.209

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in K35.20

Frequently asked questions

What is ICD-10 code K35.209?

K35.209 is the ICD-10-CM code for acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation, in the block K35-K38 (Diseases of appendix).

Is K35.209 a billable code?

Yes. K35.209 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K35.209 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.