ICD-10 Diagnosis Code Z51.81

Encounter for therapeutic drug level monitoring

Diagnosis Code Z51.81

ICD-10: Z51.81
Short Description: Encounter for therapeutic drug level monitoring
Long Description: Encounter for therapeutic drug level monitoring
This is the 2018 version of the ICD-10-CM diagnosis code Z51.81

Valid for Submission
The code Z51.81 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Factors influencing health status and contact with health services (Z00–Z99)
    • Encounters for other specific health care (Z40-Z53)
      • Encounter for other aftercare and medical care (Z51)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code Z51.81 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • V58.83 - Therapeutic drug monitor

Present on Admission (POA) Additional informationCallout TooltipPresent on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

The code Z51.81 is exempt from POA reporting.

  • Antihypertensive agent surveillance done
  • Lithium monitoring
  • Measurement of medication level in blood started
  • Warfarin monitoring status

Index of Diseases and Injuries
References found for the code Z51.81 in the Index of Diseases and Injuries:

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