CMS has made the following changes to the diagnosis requirements for billing CPT® code 85610 for anticoagulation therapy effective for dates of service after 7/1/2010.
· If the PT or INR is performed for monitoring or regulation of patients on warfarin, V58.83(encounter for therapeutic monitoring) must be coded as the primary diagnosis.
· V58.61 (current) use of anticoagulants)must be coded as the secondary diagnosis.
· The condition requiring treatment with warfarin, or the occurrence of an associated adverse event in a patient already on warfarin requiring the testing (e.g., trauma, hemorrhage), must be coded as a tertiary diagnosis on the claim.
for more info... Here's the link to CMS