M20.02 vs Z89
M20.02 (Boutonnière deformity) compared with Z89 (Acquired absence of limb), 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. M20.02 carries an Excludes1 note covering Z89: “acquired absence of fingers and toes (Z89.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. Z89 carries an Excludes1 note covering M20.02: “acquired deformities of limbs (M20-M21)”
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
| M20.02Boutonnière deformity | Z89Acquired absence of limb | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Boutonnière deformity is a non-billable ICD-10-CM category code (M20.02). | Acquired absence of limb is a non-billable ICD-10-CM category code (Z89). |
| Includes | — | amputation status postprocedural loss of limb post-traumatic loss of limb |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources