2024 ICD-10-CM Diagnosis Code T46.1X1A

Poisoning by calcium-channel blockers, accidental (unintentional), initial encounter

ICD-10-CM Code:
T46.1X1A
ICD-10 Code for:
Poisoning by calcium-channel blockers, accidental, init
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
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 agents primarily affecting the cardiovascular system
        (T46)

T46.1X1A is a billable diagnosis code used to specify a medical diagnosis of poisoning by calcium-channel blockers, accidental (unintentional), initial encounter. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

T46.1X1A is an initial encounter code, includes a 7th character and should be used while the patient is receiving active treatment for a condition like poisoning by calcium-channel blockers accidental (unintentional). According to ICD-10-CM Guidelines an "initial encounter" doesn't necessarily means "initial visit". The 7th character should be used when the patient is undergoing active treatment regardless if new or different providers saw the patient over the course of a treatment. The appropriate 7th character codes should also be used even if the patient delayed seeking treatment for a condition.

Approximate Synonyms

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

  • Accidental overdose by calcium channel blocker
  • Accidental poisoning by calcium channel blocker
  • Overdose of calcium-channel blockers
  • Poisoning by calcium-channel blockers

Clinical Classification

Clinical CategoryCCSR Category CodeInpatient Default CCSROutpatient Default CCSR
External cause codes: intent of injury, accidental/unintentionalEXT020N - Not default inpatient assignment for principal diagnosis or first-listed diagnosis.N - Not default outpatient assignment for principal diagnosis or first-listed diagnosis.
External cause codes: poisoning by drugEXT014N - Not default inpatient assignment for principal diagnosis or first-listed diagnosis.N - Not default outpatient assignment for principal diagnosis or first-listed diagnosis.
Poisoning by drugs, initial encounterINJ022Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

Clinical Information

  • Bepridil

    a long-acting calcium-blocking agent with significant anti-anginal activity. the drug produces significant coronary vasodilation and modest peripheral effects. it has antihypertensive and selective anti-arrhythmia activities and acts as a calmodulin antagonist.
  • Diltiazem

    a benzothiazepine derivative with vasodilating action due to its antagonism of the actions of calcium ion on membrane functions.
  • Felodipine

    a dihydropyridine calcium antagonist with positive inotropic effects. it lowers blood pressure by reducing peripheral vascular resistance through a highly selective action on smooth muscle in arteriolar resistance vessels.
  • Fendiline

    coronary vasodilator; inhibits calcium function in muscle cells in excitation-contraction coupling; proposed as antiarrhythmic and antianginal agents.
  • Gallopamil

    coronary vasodilator that is an analog of iproveratril (verapamil) with one more methoxy group on the benzene ring.
  • Isradipine

    a potent antagonist of calcium channels that is highly selective for vascular smooth muscle. it is effective in the treatment of chronic stable angina pectoris, hypertension, and congestive cardiac failure.
  • Lidoflazine

    coronary vasodilator with some antiarrhythmic action.
  • Nicardipine

    a potent calcium channel blockader with marked vasodilator action. it has antihypertensive properties and is effective in the treatment of angina and coronary spasms without showing cardiodepressant effects. it has also been used in the treatment of asthma and enhances the action of specific antineoplastic agents.
  • Nifedipine

    a potent vasodilator agent with calcium antagonistic action. it is a useful anti-anginal agent that also lowers blood pressure.
  • Nimodipine

    a calcium channel blockader with preferential cerebrovascular activity. it has marked cerebrovascular dilating effects and lowers blood pressure.
  • Nisoldipine

    a dihydropyridine calcium channel antagonist that acts as a potent arterial vasodilator and antihypertensive agent. it is also effective in patients with cardiac failure and angina.
  • Nitrendipine

    a calcium channel blocker with marked vasodilator action. it is an effective antihypertensive agent and differs from other calcium channel blockers in that it does not reduce glomerular filtration rate and is mildly natriuretic, rather than sodium retentive.
  • Verapamil

    a calcium channel blocker that is a class iv anti-arrhythmia agent.

Coding Guidelines

When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined. If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system (T46). Use the following options for the aplicable episode of care:

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

Convert T46.1X1A to ICD-9-CM

  • ICD-9-CM Code: 972.9 - Pois-cardiovasc agt NEC
    Combination Flag - Multiple codes are needed to describe the source diagnosis code. Correct coding should be done based on contextual judgment.
  • ICD-9-CM Code: E858.3 - Acc poisn-cardiovasc agt
    Combination Flag - Multiple codes are needed to describe the source diagnosis code. Correct coding should be done based on contextual judgment.

Table of Drugs and Chemicals

The parent code T46.1X1 of the current diagnosis 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
BepridilT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
Blockers, calcium channelT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
DiltiazemT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
FelodipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
FendilineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
GallopamilT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
IproveratrilT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
IsradipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
LidoflazineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
Monoxidine hydrochlorideT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NicardipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NifedipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NimodipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NisoldipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NitrendipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
OxodipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
TiapamilT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
VerapamilT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6

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.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.