ICD-10-CM 2027 diagnosis code
K36Other appendicitis
K36 is a valid, billable ICD-10-CM code for other appendicitis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About K36
K36 is the ICD-10-CM diagnosis code for other appendicitis. It belongs to block K35-K38 (diseases of appendix) and chapter 11 (diseases of the digestive system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 542 (other appendicitis).
Coding notes
- Chronic appendicitis
- Recurrent appendicitis
Notes that apply from higher levels
Instructions written at a parent level also apply to K36.
Broader instructions also apply from Chapter 11: Diseases of the digestive system.
Alphabetic index entries
10 entriesTerms in the official ICD-10-CM index that lead to K36.
- Appendicitis (pneumococcal) (retrocecal) › chronic (recurrent)
- Appendicitis (pneumococcal) (retrocecal) › healed (obliterative)
- Appendicitis (pneumococcal) (retrocecal) › interval
- Appendicitis (pneumococcal) (retrocecal) › neurogenic
- Appendicitis (pneumococcal) (retrocecal) › obstructive
- Appendicitis (pneumococcal) (retrocecal) › recurrent
- Appendicitis (pneumococcal) (retrocecal) › relapsing
- Appendicitis (pneumococcal) (retrocecal) › subacute (adhesive)
- Appendicitis (pneumococcal) (retrocecal) › subsiding
- Subsiding appendicitis
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 06 · Diseases and Disorders of the Digestive System
ICD-9-CM equivalent
Converter →- 542Other appendicitisexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about K36
Is K36 billable?
- Yes. K36 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K36 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K36 as a principal diagnosis.
Is K36 a CC or MCC?
- No. K36 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does K36 group to?
- K36 is used in the MS-DRG v44.0 logic for MS-DRG 393 (Other Digestive System Diagnoses with MCC), MS-DRG 394 (Other Digestive System Diagnoses with CC) and MS-DRG 395 (Other Digestive System Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for K36?
- The CMS General Equivalence Mappings map K36 to ICD-9-CM 542.