Z51.81
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BillableEncounter for therapeutic drug level monitoring
Z51.81 is the ICD-10-CM code for Encounter for therapeutic drug level monitoring. It is a billable, specific code valid for reimbursement.
Z00-Z99 Factors influencing health status and contact with health services
Excludes1 — not coded here
- •encounter for blood-drug test for administrative or medicolegal reasons (Z02.83)
Notes
- •any long-term (current) drug therapy (Z79.-)
Medications indicated for this condition
FDA labelingDrugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
Frequently asked questions
- What is ICD-10 code Z51.81?
- Z51.81 is the ICD-10-CM code for "Encounter for therapeutic drug level monitoring". It falls under Z00-Z99 Factors influencing health status and contact with health services.
- Is Z51.81 a billable code?
- Yes — Z51.81 is a billable, specific ICD-10-CM code valid for reimbursement.
- What is excluded from Z51.81?
- Excludes1 (not coded here): encounter for blood-drug test for administrative or medicolegal reasons (Z02.83).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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