S66.40
Header — not billableUnspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
The ICD-10 code for unspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level is S66.40.
S66.40 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 3 more specific codes below.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under S66.40
- S66.401Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level
- S66.402Unspecified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level
- S66.409Unspecified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level
Related codes in this category
- S66.41Strain of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelnon-billable header
- S66.42Laceration of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelnon-billable header
- S66.49Other specified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelnon-billable header
- S66.40Unspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelnon-billable header