Question 1

Is G21 a billable ICD-10 code?

Accepted Answer

No, G21 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 G21 mean?

Accepted Answer

ICD-10-CM code G21 represents Secondary parkinsonism. 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 G21 introduced?

Accepted Answer

Code G21 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 G21?

Accepted Answer

The parent category for G21 is section:G20-G26 (Extrapyramidal and movement disorders (G20-G26)). This hierarchical classification helps organize related diagnoses for more accurate coding.

Question 5

What conditions are excluded from G21?

Accepted Answer

Code G21 has Type 1 Excludes (mutually exclusive conditions) including: Huntington's disease (G10); neurocognitive disorder with Lewy bodies (G31.83); Shy-Drager syndrome (G90.3) and 1 more conditions. These conditions cannot be coded together with G21 as they represent different diagnoses.

G212026

Excludes14Not coded together

Excludes28Not included here

Is G21 a billable ICD-10 code?

What does ICD-10 code G21 mean?

When was ICD-10 code G21 introduced?

What is the parent category for ICD-10 code G21?

What conditions are excluded from G21?