S61.05 (Open bite of thumb without damage to nail) compared with S61.1 (Open wound of thumb with damage to nail), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Not coded here — these two are mutually exclusive.
“open wound of thumb with damage to nail (S61.1-)”
An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.
Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a
No — do not report together. S61.05 carries an Excludes1 note covering S61.1: “open wound of thumb with damage to nail (S61.1-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
| S61.05Open bite of thumb without damage to nail | S61.1Open wound of thumb with damage to nail | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Open bite of thumb without damage to nail is a non-billable ICD-10-CM category code (S61.05). | Open wound of thumb with damage to nail is a non-billable ICD-10-CM category code (S61.1). |
| 7th character | The appropriate 7th character is to be added to each code from category S61 | The appropriate 7th character is to be added to each code from category S61 |
| Includes | Bite of thumb NOS | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources