K36 — Other appendicitis
Is K36 billable?
Yes — K36 is billable for FY2027. K36 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. K36 may be submitted for encounters from October 1, 2026 through September 30, 2027.
K36 at a glance
| Code | K36 |
|---|---|
| Description | Other appendicitis |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does K36 group to?
K36 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.
- 393Other Digestive System Diagnoses with MCCmedical
- 394Other Digestive System Diagnoses with CCmedical
- 395Other Digestive System Diagnoses without CC/MCCmedical
How is K36 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to K36. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Subsiding appendicitis
- Appendicitis › chronic (pneumococcal) (retrocecal)
- Appendicitis › healed (pneumococcal) (retrocecal)
- Appendicitis › interval (pneumococcal) (retrocecal)
- Appendicitis › neurogenic (pneumococcal) (retrocecal)
- Appendicitis › obstructive (pneumococcal) (retrocecal)
- Appendicitis › recurrent (pneumococcal) (retrocecal)
- Appendicitis › relapsing (pneumococcal) (retrocecal)
- Appendicitis › subacute (pneumococcal) (retrocecal)
- Appendicitis › subsiding (pneumococcal) (retrocecal)
Inclusion terms
Alternative wording in documentation that is classified to K36.
- Chronic appendicitis
- Recurrent appendicitis
Excludes2 — not included here — inherited from Chapter 11
The conditions below are not part of K36, but a patient may have both at the same time. When documentation supports it, K36 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 K36 existed?
K36 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.