ICD-10-CM K65 is the diagnosis code for Peritonitis. This code falls under the section "Diseases of peritoneum and retroperitoneum" within Chapter 11 — Diseases of the digestive system (K00-K95). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as K65. They are mutually exclusive:
Understanding where K65 sits in the ICD-10-CM classification helps ensure proper coding:
No, K65 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
K65 is the ICD-10-CM diagnosis code for "Peritonitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
K65 is located in Section K65-K68 — "Diseases of peritoneum and retroperitoneum" within Chapter 11 of the ICD-10-CM Tabular List.
K65 has 7 sub-code(s) that provide more specific detail: K65.0, K65.1, K65.2, K65.3, K65.4 and more.
Use K65 when the patients documented diagnosis matches "Peritonitis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Peritonitis is K65.
No, K65 is non-billable. Use a more specific sub-code for primary diagnosis billing.
K65 is in Chapter 11 of the ICD-10-CM Tabular List.
Type 1 Excludes for K65 include: acute appendicitis with generalized peritonitis (K35.2-); aseptic peritonitis (T81.6); benign paroxysmal peritonitis (E85.0) and more.
Yes, K65 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.