Diagnosis Code

Z51.81 ENCOUNTER FOR THERAPEUTIC DRUG LEVEL MONITORING


Code Information

Diagnosis Code: Z51.81

Short Description: Encounter for therapeutic drug level monitoring

Long Description: Encounter for therapeutic drug level monitoring

The code Z51.81 is VALID for claim submission

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)
        • Z51.81 Encounter for therapeutic drug level monitoring

Code Version: 2022 ICD-10-CM


Synonyms

  • Acetaminophen above therapeutic range
  • Acetaminophen within therapeutic range
  • Aminophylline level - finding
  • Aminophylline level - finding
  • Aminophylline level - finding
  • Aminophylline: blood level - finding
  • Aminophylline: blood level - finding
  • Aminophylline: blood level - finding
  • 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
  • Carbamazepine level - finding
  • Carbamazepine level - finding
  • Carbamazepine level - finding
  • Carbamazepine level above reference range
  • Carbamazepine level below reference range
  • Carbamazepine level therapeutic
  • Digoxin level - finding
  • Digoxin level - finding
  • Digoxin level - finding
  • Digoxin level above therapeutic range
  • Digoxin level below therapeutic range
  • Digoxin level therapeutic
  • Drug action decreased
  • Drug action increased
  • Drug action prolonged
  • Drug action reversal
  • Drug action shortened
  • Effects of immunotherapy
  • Finding of serum phenobarbital level
  • Finding of serum phenobarbital level
  • Finding of serum phenobarbital level
  • Good response to medication
  • 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 level - finding
  • Lithium level - finding
  • Lithium level - finding
  • Lithium level below therapeutic range
  • Lithium level therapeutic
  • Lithium: blood level - finding
  • Lithium: blood level - finding
  • Lithium: blood level - finding
  • Measurement of medication level in blood started
  • Medication dose changed
  • Medication dose changed
  • Medication dose changed
  • Medication dose changed in response to liver function
  • 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
  • Phenobarbitone level - finding
  • Phenobarbitone level - finding
  • Phenobarbitone level - finding
  • Phenobarbitone level above therapeutic range
  • Phenobarbitone level below therapeutic range
  • Phenobarbitone level therapeutic
  • Phenothiazine injection - monitor
  • Phenytoin level - finding
  • Phenytoin level - finding
  • Phenytoin level - finding
  • Phenytoin level above therapeutic range
  • Phenytoin level below reference range
  • Phenytoin level therapeutic
  • Prescription event monitoring status
  • Pre-treatment uric acid level
  • Salicylate above therapeutic range
  • Salicylate below therapeutic range
  • Serum aminophylline above therapeutic range
  • Serum aminophylline below therapeutic range
  • Serum aminophylline level - finding
  • Serum aminophylline level - finding
  • Serum aminophylline level - finding
  • Serum aminophylline within therapeutic range
  • Serum carbamazepine above therapeutic range
  • Serum carbamazepine below therapeutic range
  • Serum carbamazepine level - finding
  • Serum carbamazepine level - finding
  • Serum carbamazepine level - finding
  • Serum carbamazepine within therapeutic range
  • Serum digoxin level - finding
  • Serum digoxin level - finding
  • Serum digoxin level - finding
  • Serum digoxin level above therapeutic range
  • Serum digoxin level below therapeutic range
  • Serum digoxin level within therapeutic range
  • Serum lithium level - finding
  • Serum lithium level - finding
  • Serum lithium level - finding
  • Serum lithium level above therapeutic range
  • Serum lithium level below therapeutic range
  • Serum lithium level within therapeutic range
  • Serum phenobarbital above therapeutic range
  • Serum phenobarbital below therapeutic range
  • Serum phenobarbital within therapeutic range
  • Serum phenytoin above therapeutic range
  • Serum phenytoin below therapeutic range
  • Serum phenytoin level - finding
  • Serum phenytoin level - finding
  • Serum phenytoin level - finding
  • Serum phenytoin within therapeutic range
  • Serum sodium valproate above therapeutic range
  • Serum sodium valproate below therapeutic range
  • Serum sodium valproate level - finding
  • Serum sodium valproate level - finding
  • Serum sodium valproate level - finding
  • Serum sodium valproate within therapeutic range
  • Therapeutic drug effect
  • Valproate level - finding
  • Valproate level - finding
  • Valproate level - finding
  • Warfarin monitoring status

Diagnostic Related Group(s)

The code Z51.81 is grouped in the following Diagnostic Related Group(s) (MS-DRG v39.0)
  • Aftercare With Cc/mcc (949)
  • Aftercare Without Cc/mcc (950)

References to Index of Diseases and Injuries

The code Z51.81 has the following ICD-10-CM references to the Index of Diseases and Injuries
  • Type 1 Excludes Notes:
    • encounter for blood-drug test for administrative or medicolegal reasons (@Z02.83*)
  • Code Also:
    • any long-term (current) drug therapy (@Z79*.-)

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
Z51.81 Right Arrow V58.83 Therapeutic drug monitor

This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code ICD-10 Description
Z51 Encounter for other aftercare and medical care
Z51.0 Encounter for antineoplastic radiation therapy
Z51.1 Encounter for antineoplastic chemotherapy and immunotherapy
Z51.11 Encounter for antineoplastic chemotherapy
Z51.12 Encounter for antineoplastic immunotherapy
Z51.5 Encounter for palliative care
Z51.6 Encounter for desensitization to allergens
Z51.8 Encounter for other specified aftercare
Z51.89 Encounter for other specified aftercare


This page was last updated on: 10/1/2023