Z51.81 - Encounter for therapeutic drug level monitoring

The ICD 10 Code for Encounter for therapeutic drug level monitoring is listed as Z51.81.
Additional information concerning this code and description can be found below including ICD 9 crosswalks / GEMS, chapter information, and DRGs where available.

ICD 10 CM Field	Value
Diagnosis Code:	Z51.81
Description:	Encounter for therapeutic drug level monitoring Excludes1: encounter for blood-drug test for administrative or medicolegal reasons (Z02.83) Code also any long-term (current) drug therapy (Z79.-)
Diagnostic Related Groups (MS-DRG v30.0)	945 - Rehabilitation W Cc/mcc 946 - Rehabilitation W/o Cc/mcc 949 - Aftercare W Cc/mcc 950 - Aftercare W/o Cc/mcc

Chapter	Factors influencing health status and contact with health services (Z00-Z99)
Block	Encounters for other specific health care (Z40-Z53)
Parent	Z51.8 - Encounter for other specified aftercare
ICD-9-CM Diagnosis Codes General Equivalence Mappings (GEMS):
ICD 9 Dx Code:	V58.83 - Encounter for therapeutic drug monitoring
ICD-10-CM Siblings (same level / similar specificity) of Z51.81:
Z51.89 - Encounter for other specified aftercare