790.92 is for an abnormal coagulation profile not for Coumadin therapy.
You would use v58.61 long-term (current) use of anticoagulants to code current Coumadin use. If the physician documents that the coagulation profile is abnormal then you could code it. In the ICD 9 under the code in the tabular it gives examples of what constitutes abnormal or prolonged.
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