K35.200 — Acute appendicitis with generalized peritonitis, without perforation or abscess
Is K35.200 billable?
Yes — K35.200 is billable for FY2027. K35.200 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. K35.200 may be submitted for encounters from October 1, 2026 through September 30, 2027.
K35.200 at a glance
| Code | K35.200 |
|---|---|
| Description | Acute appendicitis with generalized peritonitis, without perforation or abscess |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does K35.200 group to?
K35.200 sits in MDC 06 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 371Major Gastrointestinal Disorders and Peritoneal Infections with MCCmedical
- 372Major Gastrointestinal Disorders and Peritoneal Infections with CCmedical
- 373Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCCmedical
As a secondary diagnosis, K35.200 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is K35.200 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to K35.200. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Appendicitis › with › peritonitis NEC › generalized › without rupture or perforation of appendix (pneumococcal) (retrocecal)
- Appendicitis › acute › with › peritonitis NEC › generalized › without rupture or perforation of appendix (pneumococcal) (retrocecal)
Inclusion terms
Alternative wording in documentation that is classified to K35.200.
- (Acute) appendicitis with generalized peritonitis without rupture or perforation of appendix NOS
Excludes2 — not included here — inherited from Chapter 11
The conditions below are not part of K35.200, but a patient may have both at the same time. When documentation supports it, K35.200 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)
How long has K35.200 existed?
K35.200 first appears in FY2024.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.