K65.0 — Generalized (acute) peritonitis
K65.0 is a billable, specific ICD-10-CM code for generalized (acute) peritonitis. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Pelvic peritonitis (acute), male
- Subphrenic peritonitis (acute)
- Suppurative peritonitis (acute)
Risk adjustment
K65.0 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 78 Intestinal Obstruction/Perforation0.326 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
K65.0 is named in 2 Medicare coverage policies — 2 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A56580Billing and Coding: Computerized Axial Tomography (CT), Thorax
How K65.0 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to K65.0.
- Peritonitis›acute(generalized)
- Peritonitis›diaphragmatic
- Peritonitis›diffuse
- Peritonitis›disseminated
- Peritonitis›fibropurulent
- Peritonitis›general(ized)
- Peritonitis›pancreatic
- Peritonitis›purulent
- Peritonitis›septic
- Peritonitis›subdiaphragmatic
- Peritonitis›subphrenic
- Peritonitis›suppurative
Related codes at this level
Codes that share K65. If K65.0 is not quite right, the correct code is usually one of these.
Questions about K65.0
- Is K65.0 a billable ICD-10-CM code?
- Yes. K65.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does K65.0 sit in the tabular list?
- Diseases of the digestive system (K00-K95), in the block Diseases of peritoneum and retroperitoneum (K65-K68).