ICD-10-CM Alphabetic Index · FY 2027 73 Entries
Peritonitis in the ICD-10-CM Index ICD-10-CM
The main term Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) carries 73 index entries pointing to 34 ICD-10-CM codes. The default entry is K65.9, 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 2027 index fileEffective Oct 1, 2026 – Sep 30, 2027
73
Index Entries
34
Codes Referenced
K65.9
Default Code
P
Letter
73 of 73 shown
ICD-10-CM
Index Entries Under Peritonitis 73 entries · 34 codes
Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) K65.9
with or following
abscess K65.1
appendicitis
with perforation or rupture K35.32
generalized K35.209 see also Appendicitis
localized K35.30 see also Appendicitis
diverticular disease (intestine) K57.80
with bleeding K57.81
large intestine K57.20
with
bleeding K57.21
small intestine K57.40
with bleeding K57.41
small intestine K57.00
with
bleeding K57.01
large intestine K57.40
with bleeding K57.41
ectopic or molar pregnancy O08.0
acute (generalized) K65.0
aseptic T81.61 Non-billable
bile, biliary K65.3
chemical T81.61 Non-billable
chlamydial A74.81
complicating abortion see Abortion, by type, complicated by, pelvic peritonitis
congenital P78.1
chronic proliferative K65.8
diaphragmatic K65.0
diffuse K65.0
diphtheritic A36.89
disseminated K65.0
due to
bile K65.3
foreign
body or object accidentally left during a procedure (instrument) (sponge) (swab) T81.599 Non-billable
substance accidentally left during a procedure (chemical) (powder) (talc) T81.61 Non-billable
talc T81.61 Non-billable
urine K65.8
eosinophilic K65.8
acute K65.0
fibrocaseous (tuberculous) A18.31
fibropurulent K65.0
following ectopic or molar pregnancy O08.0
general (ized) K65.0
gonococcal A54.85
meconium (newborn) P78.0
neonatal P78.1
meconium P78.0
pancreatic K65.0
paroxysmal, familial E85.0
benign E85.0
pelvic (see also, if applicable, Abscess, abdominopelvic)
female N73.5
acute N73.3
chronic N73.4
with adhesions N73.6
male K65.0
periodic, familial E85.0
proliferative, chronic K65.8
puerperal, postpartum, childbirth O85
purulent K65.0
septic K65.0
specified NEC K65.8
spontaneous bacterial K65.2
subdiaphragmatic K65.0
subphrenic K65.0
suppurative K65.0
syphilitic A52.74
talc T81.61 Non-billable
tuberculous A18.31
urine K65.8
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2027 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2026 through September 30, 2027.
