Question 1

Is T21 a billable ICD-10 code?

Accepted Answer

No, T21 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 T21 mean?

Accepted Answer

ICD-10-CM code T21 represents Burn and corrosion of trunk. 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 T21 introduced?

Accepted Answer

Code T21 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 T21?

Accepted Answer

The parent category for T21 is section:T20-T25 (Burns and corrosions of external body surface, specified by site (T20-T25)). This hierarchical classification helps organize related diagnoses for more accurate coding.

Question 5

What conditions should be coded separately from T21?

Accepted Answer

Code T21 has Type 2 Excludes including: burns and corrosion of axilla (T22.- with fifth character 4); burns and corrosion of scapular region (T22.- with fifth character 6); burns and corrosion of shoulder (T22.- with fifth character 5). These conditions are not included in T21 but can be coded together if the patient has both conditions.

Question 6

Does T21 require a 7th character extension?

Accepted Answer

Yes, T21 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., T21XXA for initial encounter). The extension indicates whether this is an initial visit, follow-up, or treatment for a late effect.

T212026

Excludes25Not included here

Use Additional Code2Add code for detail

Notes2Additional information

Includes4Included conditions

7th Character Extensions3Encounter type specifiers

Excluded By2Codes that exclude this one