K65.8 – Other peritonitis

ICD-10-CM 2027 diagnosis code · Diseases of peritoneum, retroperitoneum and pelvis

Billable code

ICD-10-CM code K65.8

Code: K65.8 (claims format: K658)
Description: Other peritonitis
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 11. Diseases of the digestive system (K00-K95)
Block: K65-K6A Diseases of peritoneum, retroperitoneum and pelvis
Parent codes: K65

Notes for K65.8

Applicable to:

Chronic proliferative peritonitis
Peritonitis due to urine

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

K65 – Peritonitis

Excludes1 (not coded here):

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.-)

Use additional code:

code (B95-B97), to identify infectious agent, if known

Code also:

if applicable diverticular disease of intestine (K57.-)

Index terms for K65.8

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in K65

K65.0 – Generalized (acute) peritonitisBillable
K65.1 – Peritoneal abscessBillable
K65.2 – Spontaneous bacterial peritonitisBillable
K65.3 – CholeperitonitisBillable
K65.4 – Sclerosing mesenteritisBillable
K65.9 – Peritonitis, unspecifiedBillable

Frequently asked questions

What is ICD-10 code K65.8?

K65.8 is the ICD-10-CM code for other peritonitis, in the block K65-K6A (Diseases of peritoneum, retroperitoneum and pelvis).

Is K65.8 a billable code?

Yes. K65.8 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K65.8 belong to?

It belongs to category K65 – Peritonitis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.