M20 vs Q74

M20 (Acquired deformities of fingers and toes) compared with Q74 (Other congenital malformations of limb(s)), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. M20 carries an Excludes1 note covering Q74: “congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

	M20Acquired deformities of fingers and toes	Q74Other congenital malformations of limb(s)
Billing status	Non-billable header Report instead: M20.001, M20.002, M20.009, M20.011, M20.012	Non-billable header Report instead: Q74.0, Q74.1, Q74.2, Q74.3, Q74.8
Classification	M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)	Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99)
Definition	Acquired deformities of fingers and toes is a non-billable ICD-10-CM category code (M20).	Other congenital malformations of limb(s) is a non-billable ICD-10-CM category code (Q74).

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources