Question 1

Is M21 a billable ICD-10 code?

Accepted Answer

No, M21 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 M21 mean?

Accepted Answer

ICD-10-CM code M21 represents Other acquired deformities of limbs. 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 M21 introduced?

Accepted Answer

Code M21 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 M21?

Accepted Answer

The parent category for M21 is section:M20-M25 (Other joint disorders (M20-M25)). This hierarchical classification helps organize related diagnoses for more accurate coding.

Question 5

What conditions are excluded from M21?

Accepted Answer

Code M21 has Type 1 Excludes (mutually exclusive conditions) including: acquired absence of limb (Z89.-); congenital absence of limbs (Q71-Q73); congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74). These conditions cannot be coded together with M21 as they represent different diagnoses.

M212026

Excludes13Not coded together

Excludes213Not included here

Notes1Additional information

Is M21 a billable ICD-10 code?

What does ICD-10 code M21 mean?

When was ICD-10 code M21 introduced?

What is the parent category for ICD-10 code M21?

What conditions are excluded from M21?