2024 ICD-10-CM Diagnosis Code T45.516

Underdosing of anticoagulants

ICD-10-CM Code:
T45.516
ICD-10 Code for:
Underdosing of anticoagulants
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances
      (T36-T50)
      • Poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified
        (T45)

T45.516 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of underdosing of anticoagulants. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Underdosing of anticoagulants

Non-specific codes like T45.516 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for underdosing of anticoagulants:

  • Use T45.516A for initial encounter - BILLABLE CODE

  • Use T45.516D for subsequent encounter - BILLABLE CODE

  • Use T45.516S for sequela - BILLABLE CODE

Clinical Information

  • Acenocoumarol

    a coumarin that is used as an anticoagulant. its actions and uses are similar to those of warfarin. (from martindale, the extra pharmacopoeia, 30th ed, p233)
  • Phenindione

    an indandione that has been used as an anticoagulant. phenindione has actions similar to warfarin, but it is now rarely employed because of its higher incidence of severe adverse effects. (from martindale, the extra pharmacopoeia, 30th ed, p234)
  • Phenprocoumon

    coumarin derivative that acts as a long acting oral anticoagulant.
  • Warfarin

    an anticoagulant that acts by inhibiting the synthesis of vitamin k-dependent coagulation factors. warfarin is indicated for the prophylaxis and/or treatment of venous thrombosis and its extension, pulmonary embolism, and atrial fibrillation with embolization. it is also used as an adjunct in the prophylaxis of systemic embolism after myocardial infarction. warfarin is also used as a rodenticide.

Coding Guidelines

Underdosing refers to taking less of a medication than is prescribed by a provider or a manufacturer's instruction. Codes for underdosing should never be assigned as principal or first-listed codes. If a patient has a relapse or exacerbation of the medical condition for which the drug is prescribed because of the reduction in dose, then the medical condition itself should be coded.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified (T45). Use the following options for the aplicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Table of Drugs and Chemicals

The code is referenced in the Table of Drugs and Chemicals, this table contains a classification of drugs, industrial solvents, corrosive gases, noxious plants, pesticides, and other toxic agents.

According to ICD-10-CM coding guidelines it is advised to do not code directly from the Table of Drugs and Chemicals, instead always refer back to the Tabular List when doing the initial coding. Each substance in the table is assigned a code according to the poisoning classification and external causes of adverse effects. It is important to use as many codes as necessary to specify all reported drugs, medicinal or chemical substances. If the same diagnosis code describes the causative agent for more than one adverse reaction, poisoning, toxic effect or underdosing, utilize the code only once.

Substance Poisoning
Accidental
(unintentional)
Poisoning
Accidental
(self-harm)
Poisoning
Assault
Poisoning
Undetermined
Adverse
effect
Underdosing
AcenocoumarinT45.511T45.512T45.513T45.514T45.515T45.516
AcenocoumarolT45.511T45.512T45.513T45.514T45.515T45.516
AnisindioneT45.511T45.512T45.513T45.514T45.515T45.516
Anticoagulant NECT45.511T45.512T45.513T45.514T45.515T45.516
Anticoagulant NEC
  »Antagonist
T45.511T45.512T45.513T45.514T45.515T45.516
BishydroxycoumarinT45.511T45.512T45.513T45.514T45.515T45.516
BromindioneT45.511T45.512T45.513T45.514T45.515T45.516
CoumadinT45.511T45.512T45.513T45.514T45.515T45.516
Coumadin
  »rodenticide
T45.511T45.512T45.513T45.514T45.515T45.516
CoumarinT45.511T45.512T45.513T45.514T45.515T45.516
CoumetarolT45.511T45.512T45.513T45.514T45.515T45.516
CumetharolT45.511T45.512T45.513T45.514T45.515T45.516
DaniloneT45.511T45.512T45.513T45.514T45.515T45.516
Dicoumarol, dicoumarin, dicumarolT45.511T45.512T45.513T45.514T45.515T45.516
DiphenadioneT45.511T45.512T45.513T45.514T45.515T45.516
Diphenadione
  »rodenticide
T45.511T45.512T45.513T45.514T45.515T45.516
Drotrecogin alfaT45.511T45.512T45.513T45.514T45.515T45.516
Enoxaparin (sodium)T45.511T45.512T45.513T45.514T45.515T45.516
FluindioneT45.511T45.512T45.513T45.514T45.515T45.516
Heparin (sodium)T45.511T45.512T45.513T45.514T45.515T45.516
Heparin (sodium)
  »action reverser
T45.511T45.512T45.513T45.514T45.515T45.516
Heparin-fractionT45.511T45.512T45.513T45.514T45.515T45.516
Heparinoid (systemic)T45.511T45.512T45.513T45.514T45.515T45.516
Indandione (derivatives)T45.511T45.512T45.513T45.514T45.515T45.516
Indendione (derivatives)T45.511T45.512T45.513T45.514T45.515T45.516
NicoumaloneT45.511T45.512T45.513T45.514T45.515T45.516
PanwarfinT45.511T45.512T45.513T45.514T45.515T45.516
PhenindioneT45.511T45.512T45.513T45.514T45.515T45.516
PhenprocoumonT45.511T45.512T45.513T45.514T45.515T45.516
SintromT45.511T45.512T45.513T45.514T45.515T45.516
TioclomarolT45.511T45.512T45.513T45.514T45.515T45.516
WarfarinT45.511T45.512T45.513T45.514T45.515T45.516
Warfarin
  »rodenticide
T45.511T45.512T45.513T45.514T45.515T45.516
Warfarin
  »sodium
T45.511T45.512T45.513T45.514T45.515T45.516
XigrisT45.511T45.512T45.513T45.514T45.515T45.516
ZovantT45.511T45.512T45.513T45.514T45.515T45.516

Patient Education


Medication Errors

Medicines treat infectious diseases, prevent problems from chronic diseases, and ease pain. But medicines can also cause harmful reactions if not used correctly. Errors can happen in the hospital, at the health care provider's office, at the pharmacy, or at home. You can help prevent errors by:

  • Knowing your medicines. When you get a prescription, ask the name of the medicine and check to make sure that the pharmacy gave you the right medicine. Make sure that you understand how often you should take the medicine and how long you should take it.
  • Keeping a list of medicines.
    • Write down all of the medicines that you are taking, including the names of your medicines, how much you take, and when you take them. Make sure to include any over-the-counter medicines, vitamins, supplements, and herbs that you take.
    • List the medicines that you are allergic to or that have caused you problems in the past.
    • Take this list with you every time you see a health care provider.
  • Reading medicine labels and following the directions. Don't just rely on your memory - read the medication label every time. Be especially careful when giving medicines to children.
  • Asking questions. If you don't know the answers to these questions, ask your health care provider or pharmacist:
    • Why am I taking this medicine?
    • What are the common side effects?
    • What should I do if I have side effects?
    • When should I stop this medicine?
    • Can I take this medicine with the other medicines and supplements on my list?
    • Do I need to avoid certain foods or alcohol while taking this medicine?

Food and Drug Administration


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.