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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Supplementary Classification Of Factors Influencing Health Status And Contact With Health Services V01-V86 > Persons Encountering Health Services For Specific Procedures And Aftercare V50-V59 > Encounter For Other And Unspecified Procedures And Aftercare V58.* > 2008 ICD-9-CM Diagnosis V58.83 Encounter for therapeutic drug monitoring  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM V58.83 can be accessed here. V58.83 is a specific code that can be used to specify a diagnosis V58.83 contains 3 index entries View the ICD-9-CM Volume 1 V58.* hierarchy Use additional code for any associated long-term (current) drug use (V58.61-V58.69) V58.83 excludes: blood-drug testing for medicolegal reasons (V70.4) Index entries containing V58.83: Admission (encounter) for drug monitoring, therapeutic V58.83 therapeutic drug monitoring V58.83 Test(s) blood-drug V70.4 for therapeutic drug monitoring V58.83