K65.1: Peritoneal abscess
K65.1 is a billable, specific ICD-10-CM code for peritoneal abscess. It is valid for submission on a claim.
Check K65.1 with the rest of the claim: free scrubberExcludes2: not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
- pelvic abscess (extraperitoneal) (K6A.0-)
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Abdominopelvic abscess
- Abscess (of) omentum
- Abscess (of) peritoneum
- Mesenteric abscess
- Retrocecal abscess
- Subdiaphragmatic abscess
- Subhepatic abscess
- Subphrenic abscess
Excludes1 inherited from the categories above K65.1
A category’s note binds every code beneath it.
Written on K65: Peritonitis
- 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.-)
Risk adjustment
K65.1 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. Look up the whole chart to see which of its HCCs the hierarchy would zero.
Medicare coverage
K65.1 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A56580Billing and Coding: Computerized Axial Tomography (CT), Thorax
Alphabetic index entries that lead here
- Abscess›abdominopelvic
- Abscess›diaphragm, diaphragmatic
- Abscess›epiploon, epiploic
- Abscess›intra-abdominal
- Abscess›intraperitoneal
- Abscess›mesentery, mesenteric
- Abscess›omentum
- Abscess›peritoneum, peritoneal(perforated) (ruptured)
- Abscess›retrocecal
- Abscess›subdiaphragmatic
- Abscess›subhepatic
- Abscess›subphrenic
Code history
Unchanged in every release from FY2024 to FY2027.