K35.80 – Unspecified acute appendicitis

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

Billable code

ICD-10-CM code K35.80
Code
K35.80 (claims format: K3580)
Description
Unspecified acute appendicitis
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 › K35.8

Notes for K35.80

Applicable to:
  • Acute appendicitis NOS
  • Acute appendicitis without (localized) (generalized) peritonitis

Index terms for K35.80

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

Related codes in K35.8

Frequently asked questions

What is ICD-10 code K35.80?

K35.80 is the ICD-10-CM code for unspecified acute appendicitis, in the block K35-K38 (Diseases of appendix).

Is K35.80 a billable code?

Yes. K35.80 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K35.80 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.