2024 ICD-10-CM Diagnosis Code T42.3X6A

Underdosing of barbiturates, initial encounter

ICD-10-CM Code:
T42.3X6A
ICD-10 Code for:
Underdosing of barbiturates, initial encounter
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 antiepileptic, sedative- hypnotic and antiparkinsonism drugs
        (T42)

T42.3X6A is a billable diagnosis code used to specify a medical diagnosis of underdosing of barbiturates, 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.

T42.3X6A 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 barbiturates. 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 Information

  • Barbital

    a long-acting barbiturate that depresses most metabolic processes at high doses. it is used as a hypnotic and sedative and may induce dependence. barbital is also used in veterinary practice for central nervous system depression.
  • Hexobarbital

    a barbiturate that is effective as a hypnotic and sedative.
  • Mephobarbital

    a barbiturate that is metabolized to phenobarbital. it has been used for similar purposes, especially in epilepsy, but there is no evidence mephobarbital offers any advantage over phenobarbital.
  • Pentobarbital

    a short-acting barbiturate that is effective as a sedative and hypnotic (but not as an anti-anxiety) agent and is usually given orally. it is prescribed more frequently for sleep induction than for sedation but, like similar agents, may lose its effectiveness by the second week of continued administration. (from ama drug evaluations annual, 1994, p236)
  • Phenobarbital

    a barbituric acid derivative that acts as a nonselective central nervous system depressant. it potentiates gamma-aminobutyric acid action on gaba-a receptors, and modulates chloride currents through receptor channels. it also inhibits glutamate induced depolarizations.
  • Secobarbital

    a barbiturate that is used as a sedative. secobarbital is reported to have no anti-anxiety activity.

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 antiepileptic, sedative- hypnotic and antiparkinsonism drugs (T42). 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.

Convert T42.3X6A to ICD-9-CM

  • ICD-9-CM Code: -
    No Map Flag -

Table of Drugs and Chemicals

The parent code T42.3X6 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
AgrypnalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
AllobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
AllylisopropylmalonylureaT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
AllypropymalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
AlurateT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Amobarbital (sodium)T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
AmylobarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Amytal (sodium)T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
AprobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
BarbenylT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
BarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Barbital
  »sodium
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
BarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Barbiturate NECT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Barbiturate NEC
  »with tranquilizer
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Barbiturate NEC
  »anesthetic (intravenous)
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
BrallobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Butabarbital (sodium)T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
ButabarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
ButabarpalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
ButalbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
ButallylonalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
ButethalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Butisol (sodium)T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
ButobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Butobarbital
  »sodium
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
ButobarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
CarbritalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
CyclobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
CyclobarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
DelvinalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diallylbarbituric acidT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
DiallymalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
DiemalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
DiethylT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »barbituric acid
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »carbamazine
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »carbinol
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »carbonate
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »ether (vapor) [See Also: ether]
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »oxide
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »propion
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »stilbestrol
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »toluamide (nonmedicinal)
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Diethyl
  »toluamide (nonmedicinal)
    »medicinal
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
DifebarbamateT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
DormiralT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
EnhexymalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
EskabarbT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
EthobralT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
EtilfenT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
EtovalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
EunerylT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
EvipalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Evipal
  »sodium
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
EvipanT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Evipan
  »sodium
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
FebarbamateT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
FenobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
GardenalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
GardepanylT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
GemonilT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
HeptabarbT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
HeptabarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
HeptabarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
HexemalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Hexethal (sodium)T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
HexobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Hexobarbital
  »rectal
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Hexobarbital
  »sodium
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
IpralT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
LotusateT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
LuminalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MeballymalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MebaralT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MebumalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MedinalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MedominT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MephebarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MephobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MetharbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MethituralT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Methobarbital, methobarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MethylhexabitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MethylphenobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
MysolineT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NealbarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NembutalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NeonalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NeravalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NeravanT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NeurobarbT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NoptilT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NunolT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Ortal (sodium)T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PentobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Pentobarbital
  »sodium
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PentobarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PentymalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PernoctonT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PernostonT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Phanodorm, phanodornT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PhemitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PhenemalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PhenobalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PhenobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Phenobarbital
  »with
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Phenobarbital
  »with
    »mephenytoin
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Phenobarbital
  »with
    »phenytoin
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Phenobarbital
  »sodium
T42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PhenobarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PhenonylT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PhenylmethylbarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
ProbarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
PropallylonalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
ProxibarbalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
QuinalbarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Quinalbarbitone sodiumT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
SecbutabarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
SecbutabarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
SecobarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
SeconalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
SomonalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
SonerylT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
TalbutalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
VeramonT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
VeronalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Vinbarbital, vinbarbitoneT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
VinylbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6

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.