K35.3 — Acute appendicitis with localized peritonitis
Not billable
Is K35.3 billable?
No — K35.3 is a non-billable header code. K35.3 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath K35.3.
Billable codes under this header
- K35.30Acute appendicitis with localized peritonitis, without perforation or gangrene
- K35.31Acute appendicitis with localized peritonitis and gangrene, without perforation
- K35.32Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess
- K35.33Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess
K35.3 at a glance
| Code | K35.3 |
|---|---|
| Description | Acute appendicitis with localized peritonitis |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes2 — not included here — inherited from Chapter 11
The conditions below are not part of K35.3, but a patient may have both at the same time. When documentation supports it, K35.3 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
What codes fall under K35.3? (4)
- K35.30Acute appendicitis with localized peritonitis, without perforation or gangrene
- K35.31Acute appendicitis with localized peritonitis and gangrene, without perforation
- K35.32Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess
- K35.33Acute appendicitis with perforation, localized peritonitis, and gangrene, with abscess
How long has K35.3 existed?
K35.3 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
- FY2019: K35.3 stopped being billable
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.