ICD-10 Code K68.1 – Retroperitoneal abscess (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K68.1 – Retroperitoneal abscess
What it is
K68.1 identifies a localized collection of pus in the retroperitoneal space, the area behind the abdominal lining. Use it when documentation clearly states a retroperitoneal abscess.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe abdominal, flank, or back pain, fever, tenderness, or imaging evidence of a retroperitoneal fluid collection consistent with abscess.
When to use this code
Use K68.1 when the provider documents a retroperitoneal abscess, whether confirmed by imaging, surgery, or other diagnostic evaluation. It may also apply when the abscess is listed as the principal or secondary diagnosis. Code any associated underlying condition if documented.
Do not use for
Do not use this code for nonspecific abdominal pain, cellulitis, or abscesses in other anatomic sites. Check documentation if the source is a renal, psoas, or intra-abdominal process rather than a true retroperitoneal abscess.
Coding tip
Verify the exact anatomic location in the record before assigning K68.1, because similar abscesses in adjacent structures may require different codes.