Is M20.031 a billable ICD-10-CM code?

Yes. M20.031 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does M20.031 sit in the tabular list?

Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other joint disorders (M20-M25).

What cannot be coded together with M20.031?

M20.031 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M20.031 (M20.0, M20) and apply to it just the same.

M20.031

M20.031 — Swan-neck deformity of right finger(s)

Billable / specific codeICD-10-CMright

M20.031 is a billable, specific ICD-10-CM code for swan-neck deformity of right finger(s). It is valid for submission on a claim.

Excludes1 inherited from the categories above M20.031

These are not written on M20.031, but they bind it: a note on a category applies to every code beneath it. Billing M20.031 with anything listed here is a denial.

Written on M20.0 — Deformity of finger(s)

clubbing of fingers (R68.3)
palmar fascial fibromatosis [Dupuytren] (M72.0)
trigger finger (M65.3)

Written on M20 — Acquired deformities of fingers and toes

acquired absence of fingers and toes (Z89.-)
congenital absence of fingers and toes (Q71.3-, Q72.3-)
congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)

Risk adjustment

M20.031 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

M20.031 is named in 11 Medicare coverage policies — 4 listing it as supporting medical necessity, and 7 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A58865Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
A58883Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
A58893Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
A59374Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered

Code history

M20.031 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share M20.03. If M20.031 is not quite right, the correct code is usually one of these.

Questions about M20.031

Is M20.031 a billable ICD-10-CM code?: Yes. M20.031 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does M20.031 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other joint disorders (M20-M25).
What cannot be coded together with M20.031?: M20.031 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M20.031 (M20.0, M20) and apply to it just the same.