Non-Billable / Non-Specific Code
ICD-10-CM K66 is the diagnosis code for Other disorders of peritoneum. This code falls under the section "Diseases of peritoneum and retroperitoneum" within Chapter 11 â 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 are not included in K66. If the patient has both, code each condition separately:
Understanding where K66 sits in the ICD-10-CM classification helps ensure proper coding:
No, K66 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
K66 is the ICD-10-CM diagnosis code for "Other disorders of peritoneum". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
K66 is located in Section K65-K68 â "Diseases of peritoneum and retroperitoneum" within Chapter 11 of the ICD-10-CM Tabular List.
K66 has 4 sub-code(s) that provide more specific detail: K66.0, K66.1, K66.8, K66.9.
Use K66 when the patients documented diagnosis matches "Other disorders of peritoneum" 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 Other disorders of peritoneum is K66.
No, K66 is non-billable. Use a more specific sub-code for primary diagnosis billing.
K66 is in Chapter 11 of the ICD-10-CM Tabular List.
Yes, K66 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.