Patient takes Coumadin 9 mg daily for hx DVT/PE and is supposed to get INR checked weekly but has not had INR checked for 2-3 months as instructed by PCP. The patient went to see PCP, blood work revealed a INR of 6.8, goal is 2-3 and was sent to the ED for evaluation. Coumadin was held and patient was given Vitamin K 2.5mg PO once.
Prolonged prothrombin time is an expected result when taking Coumadin. As patient was not getting INR checked as instructed would this be coded as Coumadin poisoning or abnormal coagulation profile?
Appreciate any advice that can be provided.