K65.9

Billable

Peritonitis, unspecified

HCC Category Mapping

V28HCC 78 — Intestinal Obstruction/Perforation

0.000

V24HCC 33 — Intestinal Obstruction/Perforation

0.226

ESRDHCC 33 — Intestinal Obstruction/Perforation

0.000

What This Code Means

Peritonitis without specification of the type or cause; used when the specific form of peritoneal inflammation is not documented.

Coding Tips

•Use only when the specific type of peritonitis cannot be determined from documentation
•Query the provider for additional details to assign a more specific code

Clinical Significance

Unspecified peritonitis represents a serious inflammatory condition with potential for life-threatening complications including sepsis and multi-organ failure. This diagnosis requires urgent medical attention and comprehensive treatment to prevent mortality and long-term complications.

Documentation Requirements

✓Documentation of peritonitis diagnosis by provider
✓Clinical signs of peritoneal inflammation
✓Absence of specific type documentation
✓Laboratory findings consistent with inflammation
✓Imaging studies showing peritoneal involvement
✓Treatment modalities employed
✓Patient response to interventions
✓Absence of more specific peritonitis classification

Commonly Confused Codes

K65.0 — Acute peritonitis requires specific acute documentation K65.8 — Other peritonitis used when specific non-infectious cause identified K67 — Used when peritonitis is due to infectious disease classified elsewhere A41.9 — Sepsis should be coded separately if present R10.9 — Abdominal pain alone insufficient without inflammatory evidence

Code Hierarchy

└K65Peritonitis └K65.9Peritonitis, unspecified

└K65.9Peritonitis, unspecified