ICD-10-CM Alphabetic Index · FY 2026 59 Entries
Appendicitis in the ICD-10-CM Index ICD-10-CM
The main term Appendicitis (pneumococcal) (retrocecal) carries 59 index entries pointing to 17 ICD-10-CM codes. The default entry is K37, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
59
Index Entries
17
Codes Referenced
K37
Default Code
A
Letter
59 of 59 shown
ICD-10-CM
Index Entries Under Appendicitis 59 entries · 17 codes
Appendicitis (pneumococcal) (retrocecal) K37
with
gangrene K35.891
with localized peritonitis K35.31
perforation NOS K35.32
peritoneal abscess K35.33
peritonitis NEC K35.33
generalized K35.209
with
abscess K35.219
with perforation or rupture K35.211
following rupture or perforation of appendix NOS K35.211
without perforation or rupture K35.210
perforation or rupture K35.201
following rupture or perforation of appendix NOS K35.201
without rupture or perforation of appendix K35.200
localized K35.30
with
gangrene K35.31
perforation K35.32
and abscess K35.33
rupture (with localized peritonitis) K35.32
acute (catarrhal) (fulminating) (obstructive) (retrocecal) (suppurative) K35.80
with
gangrene K35.891
peritoneal abscess K35.33
peritonitis NEC K35.33
generalized K35.209
with
abscess K35.219
with perforation or rupture K35.211
following rupture or perforation of appendix NOS K35.211
without perforation or rupture K35.210
perforation or rupture K35.201
following rupture or perforation of appendix NOS K35.201
without rupture or perforation of appendix K35.200
localized K35.30
with
gangrene K35.31
perforation K35.32
and abscess K35.33
specified NEC K35.890
with gangrene K35.891
with localized peritonitis K35.31
amebic A06.89
chronic (recurrent) K36
exacerbation see Appendicitis, with, gangrene
gangrenous see Appendicitis, acute
healed (obliterative) K36
interval K36
neurogenic K36
obstructive K36
recurrent K36
relapsing K36
ruptured NOS (with localized peritonitis) K35.32
subacute (adhesive) K36
subsiding K36
suppurative see Appendicitis, acute
tuberculous A18.32
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
