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M21

Non-billable

Other acquired deformities of limbs

M21 is the ICD-10-CM code for Other acquired deformities of limbs. It is a non-billable category code — use a more specific child code such as M21.0 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Subcodes
10
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

Excludes1 — not coded here

  • •acquired absence of limb (Z89.-)
  • •congenital absence of limbs (Q71-Q73)
  • •congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)

Excludes2 — not included here

  • •acquired deformities of fingers or toes (M20.-)
  • •coxa plana (M91.2)

Frequently asked questions

What is ICD-10 code M21?
M21 is the ICD-10-CM code for "Other acquired deformities of limbs". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M21 a billable code?
No — M21 is a non-billable header code. Use a more specific child code (such as M21.0) for billing.
What are the subcodes of M21?
M21 has 10 more specific child codes, including M21.0, M21.1, M21.2.
What is excluded from M21?
Excludes1 (not coded here): acquired absence of limb (Z89.-); congenital absence of limbs (Q71-Q73); congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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