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    v1.0.28
    OpenPayerBilling CodesDiseases of peritoneum and retroperitoneumICD-10-CM k66-other-disorders-of-peritoneum
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    ICD-10-CM Code For Other Disorders Of Peritoneum: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group K66 includes noninfectious and other specified disorders of the peritoneum and retroperitoneum such as peritoneal adhesions, peritoneal fibrosis, and localized or generalized peritoneal conditions that are not classified elsewhere. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving peritoneal membrane pathology, postoperative complications, or chronic peritoneal processes, capturing disease severity, organ involvement, or clinical complexity relevant to this group. Accurate coding within the ICD-10-CM K66 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM K66: Other Disorders Of Peritoneum Overview

    The ICD-10-CM K66 group captures noninfectious and nonspecific disorders of the peritoneum and retroperitoneal space, including fibrosis, adhesions, and spontaneous or chronic conditions affecting the peritoneal lining. These diagnoses relate to the abdominal serous membrane and structures within the peritoneal cavity and retroperitoneum. Accurate coding matters for correct claim processing and to reflect clinical complexity that influences care planning and reimbursement.

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    When to Use

    Codes from this group are used when a clinician documents noninfectious or unspecified peritoneal disorders, postoperative peritoneal complications, or chronic peritoneal pathology without an alternative specific code. Select the most specific code that matches clinical findings, laterality if applicable, and any documented complications to reflect the patients condition accurately.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    K66.0Peritoneal adhesions (postprocedural) (postinfection)
    K66.1Hemoperitoneum
    K66.8Other specified disorders of peritoneum
    K66.9Disorder of peritoneum, unspecified

    DRG Codes

    5 rows

    DRG CodeDescription
    393Other Digestive System Diagnoses with MCC
    394Other Digestive System Diagnoses with CC
    395Other Digestive System Diagnoses without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • An elderly patient on peritoneal dialysis presents to the emergency department with sudden onset abdominal pain, fever, cloudy dialysis effluent, and hypotension. Peritoneal fluid analysis shows a high neutrophil count and culture grows bacteria consistent with peritonitis; the clinician documents an acute infectious process of the peritoneum requiring inpatient management. Typical codes: K66.0, K66.9
    • A middle-aged patient with a history of multiple prior abdominal surgeries complains of chronic intermittent abdominal discomfort and progressive abdominal distension; imaging demonstrates loculated fluid collections and fibrous adhesions of the peritoneal cavity consistent with chronic peritoneal fibrosis/encapsulation causing bowel obstruction symptoms. The diagnosis reflects a chronic noninfectious disorder of the peritoneum contributing to ongoing gastrointestinal symptoms and potential surgical referral. Typical codes: K66.8, K66.9
    • A patient hospitalized after blunt abdominal trauma develops persistent serous drainage and a localized inflammatory tract between the peritoneal cavity and the skin, with imaging confirming an enterocutaneous fistula and ongoing peritoneal irritation; this is documented as a complication of the peritoneal surfaces leading to prolonged hospitalization and wound care. Typical codes: K66.1, K66.8

    Related Codes

    K65-PERITONITIS

    ICD-10-CM Code For Peritonitis: Group Overview

    K67-DISORDERS-OF-PERITONEUM

    ICD-10-CM Code For Disorders Of Peritoneum In Infectious Diseases Classified Elsewhere: Group Overview

    K68-DISORDERS-OF-RETROPERITONEUM

    ICD-10-CM Code For Disorders Of Retroperitoneum: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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