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Z51.81 Encounter for therapeutic drug level monitoring
BackZ51Encounter for other aftercare and medical careCategory6 →Z51.0Encounter for antineoplastic radiation therapyCategoryZ51.1Encounter for antineoplastic chemotherapy and immunotherapyCategory2 →Z51.11Encounter for antineoplastic chemotherapyCategoryZ51.12Encounter for antineoplastic immunotherapyCategoryZ51.5Encounter for palliative careCategoryZ51.6Encounter for desensitization to allergensCategoryZ51.8Encounter for other specified aftercareCategory2 →Z51.81Encounter for therapeutic drug level monitoringCategoryZ51.89Encounter for other specified aftercareCategoryZ51.AEncounter for sepsis aftercareCategory
CategoryCODABLE
Z51.81
Encounter for therapeutic drug level monitoring
EXCLUDES
Excludes1: encounter for blood-drug test for administrative or medicolegal reasons (Z02.83)
CODING RULE
Code also: any long-term (current) drug therapy (Z79.-)
- Chapter
- XXI · Factors influencing health status and contact with health services
- Section
- Z40-Z53
- Valid from
Source
CMS ICD-10-CM Tabular List, edition FY2026.