M20.03Header code — not billable
Swan-neck deformity
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue
- Category
- M20
- Effective date
- October 1, 2026
Related codes in category M20
M20Acquired deformities of fingers and toesM20.0Deformity of finger(s)M20.00Unspecified deformity of finger(s)M20.001Unspecified deformity of right finger(s)YesM20.002Unspecified deformity of left finger(s)YesM20.009Unspecified deformity of unspecified finger(s)YesM20.01Mallet fingerM20.011Mallet finger of right finger(s)YesM20.012Mallet finger of left finger(s)YesM20.019Mallet finger of unspecified finger(s)YesM20.02Boutonniere deformityM20.021Boutonniere deformity of right finger(s)Yes
Frequently asked questions
What is ICD-10 code M20.03?
M20.03 is an ICD-10-CM diagnosis code for Swan-neck deformity.
Is M20.03 a billable code?
No. M20.03 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is M20.03 in?
M20.03 falls under Chapter 13: Diseases of the musculoskeletal system and connective tissue.
When did M20.03 become effective?
M20.03 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to M20.03?
M20.03 belongs to category M20, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.