ICD-10-CM Code Z51.81

Encounter for therapeutic drug level monitoring

Version 2020 Billable Code POA Exempt

Valid for Submission

Z51.81 is a billable code used to specify a medical diagnosis of encounter for therapeutic drug level monitoring. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code Z51.81 might also be used to specify conditions or terms like antihypertensive agent surveillance done, asthma monitoring status, attends hormone replacement monitoring, bronchodilators used a maximum of once daily, bronchodilators used more than once daily, bronchodilators used once daily, etc The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

ICD-10:Z51.81
Short Description:Encounter for therapeutic drug level monitoring
Long Description:Encounter for therapeutic drug level monitoring

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code Z51.81:

Code Also

Code Also
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
  • any long-term current drug therapy Z79

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • encounter for blood-drug test for administrative or medicolegal reasons Z02.83

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code Z51.81 are found in the index:


Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Antihypertensive agent surveillance done
  • Asthma monitoring status
  • Attends hormone replacement monitoring
  • Bronchodilators used a maximum of once daily
  • Bronchodilators used more than once daily
  • Bronchodilators used once daily
  • Clozapine monitoring
  • Drug action decreased
  • Drug action increased
  • Drug action prolonged
  • Drug action reversal
  • Drug action shortened
  • Drug administration observations
  • Effects of immunotherapy
  • Gout monitoring status
  • Hormone replacement monitoring check done
  • Hormone replacement monitoring status
  • Hormone replacement monitoring status
  • Inhaler technique - moderate
  • Inhaler technique - poor
  • Intermittent drugs used more
  • Lack of drug action
  • Lithium monitoring
  • Measurement of medication level in blood started
  • Medication dose changed
  • Medication dose changed
  • Medication dose changed
  • Medication dose changed
  • Medication dose changed in response to liver function
  • Medication dose changed in response to pharmacogenetic findings
  • Medication dose changed in response to renal function
  • Medication dose changed to sliding scale
  • Medication dose changed too rapidly
  • Medication monitoring up to date
  • Medication therapy changed too rapidly
  • Nebulizer technique good
  • Nebulizer technique poor
  • No nebulization since last appointment
  • PEM completed
  • Phenothiazine injection - monitor
  • Prescription event monitoring status
  • Pre-treatment uric acid level
  • Therapeutic drug effect
  • Warfarin monitoring status

Diagnostic Related Groups

The ICD-10 code Z51.81 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.

  • 949 - AFTERCARE WITH CC/MCC
  • 950 - AFTERCARE WITHOUT CC/MCC

Present on Admission (POA)

Z51.81 is exempt from POA reporting - 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. Review other POA exempt codes here .

CMS POA Indicator Options and Definitions
POA Indicator CodePOA Reason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Convert Z51.81 to ICD-9

  • V58.83 - Therapeutic drug monitor

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)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020