K65 ICD-10-CM Code: Peritonitis
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
K65Peritonitis
ICD-10-CM diagnosis code · United States clinical modification
Where K65 sits
- 1
Chapter 11
Diseases of the digestive system (K00-K95)
- 2
Section
Diseases of peritoneum, retroperitoneum and pelvis (K65-K6A)
- 3
Category K65
Peritonitis
- 4
Code K65
Peritonitis
Codes under K65
K65 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for K65.
Code first
No “code first” instruction is listed for K65.
Use additional code
- code (B95-B97), to identify infectious agent, if known
Excludes1
Conditions that should not be reported together with this code.
- acute appendicitis with generalized peritonitis (K35.2-)
- aseptic peritonitis (T81.6)
- benign paroxysmal peritonitis (E85.0)
- chemical peritonitis (T81.6)
- gonococcal peritonitis (A54.85)
- neonatal peritonitis (P78.0-P78.1)
- pelvic peritonitis, female (N73.3-N73.5)
- periodic familial peritonitis (E85.0)
- peritonitis due to talc or other foreign substance (T81.6)
- peritonitis in chlamydia (A74.81)
- peritonitis in diphtheria (A36.89)
- peritonitis in syphilis (late) (A52.74)
- peritonitis in tuberculosis (A18.31)
- peritonitis with or following abortion or ectopic or molar pregnancy (O00-O07, O08.0)
- peritonitis with or following appendicitis (K35.-)
- puerperal peritonitis (O85)
- retroperitoneal infections (K68.-)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for K65.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code K65 mean?
K65 is the FY 2027 U.S. ICD-10-CM code for “Peritonitis.”
Is K65 a billable or specific ICD-10-CM code?
No. K65 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is K65 located in ICD-10-CM?
K65 is listed in Chapter 11, Diseases of the digestive system (K00-K95), within Diseases of peritoneum, retroperitoneum and pelvis (K65-K6A) (K65–K6A), under category K65, Peritonitis.
What coding notes are listed for K65?
No inclusion terms are listed for K65 in this reference record. No code-first instruction is listed. Additional-code instructions: code (B95-B97), to identify infectious agent, if known. Excludes1 notes: acute appendicitis with generalized peritonitis (K35.2-); aseptic peritonitis (T81.6); benign paroxysmal peritonitis (E85.0); chemical peritonitis (T81.6); gonococcal peritonitis (A54.85); neonatal peritonitis (P78.0-P78.1); pelvic peritonitis, female (N73.3-N73.5); periodic familial peritonitis (E85.0); peritonitis due to talc or other foreign substance (T81.6); peritonitis in chlamydia (A74.81); peritonitis in diphtheria (A36.89); peritonitis in syphilis (late) (A52.74); peritonitis in tuberculosis (A18.31); peritonitis with or following abortion or ectopic or molar pregnancy (O00-O07, O08.0); peritonitis with or following appendicitis (K35.-); puerperal peritonitis (O85); retroperitoneal infections (K68.-). No Excludes2 note is listed.