M20.02 ICD-10-CM Code: Boutonnière deformity
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for M20.02 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
- clubbing of fingers (R68.3) Compare M20.02 vs R68.3 →
- palmar fascial fibromatosis Dupuytren
- trigger finger (M65.3) Compare M20.02 vs M65.3 →
- acquired absence of fingers and toes (Z89.-) Compare M20.02 vs Z89 →
- congenital absence of fingers and toes (Q71.3-, Q72.3-) Compare M20.02 vs Q71.3 →
- congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-) Compare M20.02 vs Q66 →
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- joints of the spine (M40-M54) Compare M20.02 vs M40 →
Frequently Compared Codes
The official Excludes notes on M20.02 name these codes. Each comparison page covers when the two can — or must not — be reported together.
Change history
No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.
Verify Before Coding
- Not billable as written — a more specific code is required.
From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.
Relationships & Classification
Other codes that name M20.02 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.
1 Excludes1 notes: Z89 (via M20.-).
4 Excludes2 notes: M21 (via M20.-), M24.5 (via M20.-), M25 (via M20.-), M95 (via M20.-).
Contextual Map
Every relationship of M20.02 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
Hierarchy
- M00-M99 — Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) (M00-M99) [Hierarchy]
- M00-M25 — Arthropathies [Hierarchy]
- M20-M25 — Other joint disorders [Hierarchy]
Referenced by Excludes1 notes
- Z89 — Acquired absence of limb [Excludes1](via M20.-): “acquired deformities of limbs (M20-M21)” · check together
Referenced by Excludes2 notes
- M21 — Other acquired deformities of limbs [Excludes2](via M20.-): “acquired deformities of fingers or toes (M20.-)” · check together
- M24.5 — Contracture of joint [Excludes2](via M20.-): “acquired deformities of limbs (M20-M21)” · check together
- M25 — Other joint disorder, not elsewhere classified [Excludes2](via M20.-): “acquired deformities of limb (M20-M21)” · check together
- M95 — Other acquired deformities of musculoskeletal system and connective tissue [Excludes2](via M20.-): “acquired deformities of limbs (M20-M21)” · check together
Nearest codes (40)
- M20 — Acquired deformities of fingers and toes [Sibling]
- M20.0 — Deformity of finger(s) [Sibling]
- M20.00 — Unspecified deformity of finger(s) [Sibling]
- M20.001 — Unspecified deformity of right finger(s) [Sibling]
- M20.002 — Unspecified deformity of left finger(s) [Sibling]
- M20.009 — Unspecified deformity of unspecified finger(s) [Sibling]
- M20.01 — Mallet finger [Sibling]
- M20.011 — Mallet finger of right finger(s) [Sibling]
- and 32 more
Frequently Asked Questions (FAQ) & Clinical Guidance
Can M20.02 be billed directly?
No. M20.02 (Boutonnière deformity) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to M20.02 in its code family, with their registry titles.
- M20.009 — Unspecified deformity of unspecified finger(s)
- M20.01 — Mallet finger
- M20.011 — Mallet finger of right finger(s)
- M20.012 — Mallet finger of left finger(s)
- M20.019 — Mallet finger of unspecified finger(s)
- M20.021 — Boutonnière deformity of right finger(s)
- M20.022 — Boutonnière deformity of left finger(s)
- M20.029 — Boutonnière deformity of unspecified finger(s)
- M20.03 — Swan-neck deformity
- M20.031 — Swan-neck deformity of right finger(s)