2024 ICD-10-CM Diagnosis Code T45.0X6A
Underdosing of antiallergic and antiemetic drugs, initial encounter
- ICD-10-CM Code:
- T45.0X6A
- ICD-10 Code for:
- Underdosing of antiallergic and antiemetic drugs, init
- Is Billable?
- Yes - Valid for Submission
- Chronic Condition Indicator: [1]
- Not chronic
- Code Navigator:
T45.0X6A is a billable diagnosis code used to specify a medical diagnosis of underdosing of antiallergic and antiemetic drugs, 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.
This code describes a circumstance which influences the patient's health status but not a current illness or injury. The code is unacceptable as a principal diagnosis.
T45.0X6A is an initial encounter code, includes a 7th character and should be used while the patient is receiving active treatment for a condition like underdosing of antiallergic and antiemetic drugs. 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.
Clinical Classification
Clinical Category is Underdosing of drugs and medicaments, initial encounter
- CCSR Category Code: INJ029
- Inpatient Default CCSR: X - Not applicable.
- Outpatient Default CCSR: X - Not applicable.
Clinical Information
Astemizole
antihistamine drug now withdrawn from the market in many countries because of rare but potentially fatal side effects.Brompheniramine
histamine h1 antagonist used in treatment of allergies, rhinitis, and urticaria.Cetirizine
a potent second-generation histamine h1 antagonist that is effective in the treatment of allergic rhinitis, chronic urticaria, and pollen-induced asthma. unlike many traditional antihistamines, it does not cause drowsiness or anticholinergic side effects.Chlorpheniramine
a histamine h1 antagonist used in allergic reactions, hay fever, rhinitis, urticaria, and asthma. it has also been used in veterinary applications. one of the most widely used of the classical antihistaminics, it generally causes less drowsiness and sedation than promethazine.Cinnarizine
a piperazine derivative having histamine h1-receptor and calcium-channel blocking activity with vasodilating and antiemetic properties but it induces parkinsonian disorders.Clemastine
a histamine h1 antagonist used as the hydrogen fumarate in hay fever, rhinitis, allergic skin conditions, and pruritus. it causes drowsiness.Cyclizine
a histamine h1 antagonist given by mouth or parenterally for the control of postoperative and drug-induced vomiting and in motion sickness. (from martindale, the extra pharmacopoeia, 30th ed, p935)Cyproheptadine
a serotonin antagonist and a histamine h1 blocker used as antipruritic, appetite stimulant, antiallergic, and for the post-gastrectomy dumping syndrome, etc.Dimenhydrinate
a drug combination that contains diphenhydramine and theophylline. it is used for treating vertigo, motion sickness, and nausea associated with pregnancy.Dimethindene
a histamine h1 antagonist. it is used in hypersensitivity reactions, in rhinitis, for pruritus, and in some common cold remedies.Diphenhydramine
a histamine h1 antagonist used as an antiemetic, antitussive, for dermatoses and pruritus, for hypersensitivity reactions, as a hypnotic, an antiparkinson, and as an ingredient in common cold preparations. it has some undesired antimuscarinic and sedative effects.Domperidone
a specific blocker of dopamine receptors. it speeds gastrointestinal peristalsis, causes prolactin release, and is used as antiemetic and tool in the study of dopaminergic mechanisms.Doxylamine
histamine h1 antagonist with pronounced sedative properties. it is used in allergies and as an antitussive, antiemetic, and hypnotic. doxylamine has also been administered in veterinary applications and was formerly used in parkinsonism.Granisetron
a serotonin receptor (5ht-3 selective) antagonist that has been used as an antiemetic for cancer chemotherapy patients.Ketotifen
a cycloheptathiophene blocker of histamine h1 receptors and release of inflammatory mediators. it has been proposed for the treatment of asthma, rhinitis, skin allergies, and anaphylaxis.Methapyrilene
histamine h1 antagonist with sedative action used as a hypnotic and in allergies.Metoclopramide
a dopamine d2 antagonist that is used as an antiemetic.Ondansetron
a competitive serotonin type 3 receptor antagonist. it is effective in the treatment of nausea and vomiting caused by cytotoxic chemotherapy drugs, including cisplatin, and has reported anxiolytic and neuroleptic properties.Pheniramine
one of the histamine h1 antagonists with little sedative action. it is used in treatment of hay fever, rhinitis, allergic dermatoses, and pruritus.Pyrilamine
a histamine h1 antagonist. it has mild hypnotic properties and some local anesthetic action and is used for allergies (including skin eruptions) both parenterally and locally. it is a common ingredient of cold remedies.Terfenadine
a selective histamine h1-receptor antagonist devoid of central nervous system depressant activity. the drug was used for allergy but withdrawn due to causing long qt syndrome.Tripelennamine
a histamine h1 antagonist with low sedative action but frequent gastrointestinal irritation. it is used to treat asthma; hay fever; urticaria; and rhinitis; and also in veterinary applications. tripelennamine is administered by various routes, including topically.Triprolidine
histamine h1 antagonist used in allergic rhinitis; asthma; and urticaria. it is a component of cough and cold medicines. it may cause drowsiness.
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
Code Edits
The Medicare Code Editor (MCE) detects and reports errors in the coding of claims data. The following ICD-10-CM Code Edits are applicable to this code:
- Unacceptable principal diagnosis - There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.
Table of Drugs and Chemicals
The parent code T45.0X6 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.
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.