Question 1

Is T42 a billable ICD-10 code?

Accepted Answer

No, T42 is not a billable code. It is a category code that requires additional specificity. You must select a more specific code from the subcategories for billing purposes.

Question 2

What does ICD-10 code T42 mean?

Accepted Answer

ICD-10-CM code T42 represents Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs. This code is part of the International Classification of Diseases, 10th Revision, Clinical Modification used for medical coding and billing in the United States.

Question 3

When was ICD-10 code T42 introduced?

Accepted Answer

Code T42 has been part of ICD-10-CM since 2016, when the coding system was mandated for use in the United States. This code was included in the original US implementation.

Question 4

What is the parent category for ICD-10 code T42?

Accepted Answer

The parent category for T42 is section:T36-T50 (Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)). This hierarchical classification helps organize related diagnoses for more accurate coding.

Question 5

What conditions should be coded separately from T42?

Accepted Answer

Code T42 has Type 2 Excludes including: drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-). These conditions are not included in T42 but can be coded together if the patient has both conditions.

Question 6

Does T42 require a 7th character extension?

Accepted Answer

Yes, T42 requires a 7th character to specify the encounter type. Available extensions include: A (initial encounter), D (subsequent encounter), S (sequela). Use "X" as a placeholder to fill empty positions before the 7th character (e.g., T42XXA for initial encounter). The extension indicates whether this is an initial visit, follow-up, or treatment for a late effect.

T422026

Excludes11Not coded together

Code First7Sequence another code first

Excludes28Not included here

Use Additional Code5Add code for detail

Notes3Additional information

Includes4Included conditions

7th Character Extensions3Encounter type specifiers

Excluded By1Codes that exclude this one