2024 ICD-10-CM Table of Drugs and Chemicals starting with letter Q

The 2024 Table of Drugs and Chemicals contains a classification of drugs, industrial solvents, corrosive gases, noxious plants, pesticides, and other toxic agents. Each substance in the table is assigned a code according to the poisoning classification and external causes of adverse effects. Use as many codes as necessary to describe all reported drugs, medicinal or chemical substances. Browse Table of Drugs and Chemicals by alphabetical order:

Substance Poisoning
Accidental
(unintentional)
Poisoning
Accidental
self-harm
Poisoning
Assault
Poisoning
Undetermined
Adverse
effect
Underdosing
QuaaludeT42.6X1T42.6X2T42.6X3T42.6X4T42.6X5T42.6X6
Quarternary ammoniumT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
Quarternary ammonium
  »anti-infective
T49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
Quarternary ammonium
  »ganglion blocking
T49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
Quarternary ammonium
  »parasympatholytic
T49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
QuazepamT42.4X1T42.4X2T42.4X3T42.4X4T42.4X5T42.4X6
QuicklimeT54.3X1T54.3X2T54.3X3T54.3X4  
Quillaja extractT48.4X1T48.4X2T48.4X3T48.4X4T48.4X5T48.4X6
QuinacrineT37.2X1T37.2X2T37.2X3T37.2X4T37.2X5T37.2X6
QuinagluteT46.2X1T46.2X2T46.2X3T46.2X4T46.2X5T46.2X6
QuinalbarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Quinalbarbitone sodiumT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
QuinalphosT60.0X1T60.0X2T60.0X3T60.0X4  
QuinaprilT46.4X1T46.4X2T46.4X3T46.4X4T46.4X5T46.4X6
QuinestradiolT38.5X1T38.5X2T38.5X3T38.5X4T38.5X5T38.5X6
QuinestradolT38.5X1T38.5X2T38.5X3T38.5X4T38.5X5T38.5X6
QuinestrolT38.5X1T38.5X2T38.5X3T38.5X4T38.5X5T38.5X6
QuinethazoneT50.2X1T50.2X2T50.2X3T50.2X4T50.2X5T50.2X6
QuingestanolT38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
QuinidineT46.2X1T46.2X2T46.2X3T46.2X4T46.2X5T46.2X6
QuinineT37.2X1T37.2X2T37.2X3T37.2X4T37.2X5T37.2X6
QuiniobineT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
QuinisocaineT49.1X1T49.1X2T49.1X3T49.1X4T49.1X5T49.1X6
QuinocideT37.2X1T37.2X2T37.2X3T37.2X4T37.2X5T37.2X6
Quinoline (derivatives) NECT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
QuinupramineT43.011T43.012T43.013T43.014T43.015T43.016
QuotaneT41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6

Coding Guidelines Table of Drugs and Chemicals

The Codes in categories T36 - T65 are combination codes that include the substance that was taken as well as the intent. No additional external cause code is required for poisonings, toxic effects, adverse effects and underdosing codes.

  • Do not code directly from the Table of Drugs and Chemicals. Always refer back to the Tabular List.
  • Use as many codes as necessary to describe completely all drugs, medicinal or biological substances.
  • If the same code would describe the causative agent for more than one adverse reaction, poisoning, toxic effect or underdosing, assign the code only once.
  • If two or more drugs, medicinal or biological substances are reported, code each individually unless a combination code is listed in the Table of Drugs and Chemicals.

(a) Adverse Effect

When coding an adverse effect of a drug that has been correctly prescribed and properly administered, assign the appropriate code for the nature of the adverse effect followed by the appropriate code for the adverse effect of the drug (T36-T50). The code for the drug should have a 5th or 6th character "5" (for example T36.0X5-) Examples of the nature of an adverse effect are tachycardia, delirium, gastrointestinal hemorrhaging, vomiting, hypokalemia, hepatitis, renal failure, or respiratory failure.

(b) Poisoning

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.

If there is also a diagnosis of abuse or dependence of the substance, the abuse or dependence is assigned as an additional code.

Examples of poisoning include:

  • (i) Error was made in drug prescription. Errors made in drug prescription or in the administration of the drug by provider, nurse, patient, or other person.
  • (ii) Overdose of a drug intentionally taken. If an overdose of a drug was intentionally taken or administered and resulted in drug toxicity, it would be coded as a poisoning.
  • (iii)Nonprescribed drug taken with correctly prescribed and properly administered drug. If a nonprescribed drug or medicinal agent was taken in combination with a correctly prescribed and properly administered drug, any drug toxicity or other reaction resulting from the interaction of the two drugs would be classified as a poisoning.
  • (iv) Interaction of drug(s) and alcohol. When a reaction results from the interaction of a drug(s) and alcohol, this would be classified as poisoning.

See Section I.C.4. if poisoning is the result of insulin pump malfunctions.

(c) Underdosing

Underdosing refers to taking less of a medication than is prescribed by a provider or a manufacturer's instruction. For underdosing, assign the code from categories T36-T50 (fifth or sixth character "6").

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.

Noncompliance (Z91.12-, Z91.13-) or complication of care (Y63.6-Y63.9) codes are to be used with an underdosing code to indicate intent, if known.

(d) Toxic Effects

When a harmful substance is ingested or comes in contact with a person, this is classified as a toxic effect. The toxic effect codes are in categories T51-T65. Toxic effect codes have an associated intent: accidental, intentional self-harm, assault and undetermined.