AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2019 Issue 4; Ask the Editor

Mesenteric Vein Thrombosis

The patient was diagnosed with acute ischemia of the ascending colon due to mesenteric vein thrombosis, which was attributed to Antithrombin III deficiency. The Index to Diseases references code I81, Portal vein, under Thrombosis, mesenteric, vein. However, mesenteric thrombosis are inclusion terms under subcategory K55.0-, Acute vascular disorders of intestine. What is the appropriate code assignment for mesenteric vein thrombosis?  ...

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