S66.108

⚠ Non-billable (Header)

Unspecified injury of flexor muscle, fascia and tendon of other finger at wrist and hand level

Injury, poisoning and certain other consequences of external causes (S00-T88)

⚠️ This is a category header code — not billable. Use a more specific child code below.

Also Known As

Unspecified injury of flexor muscle, fascia and tendon of specified finger with unspecified laterality at wrist and hand level

⚠️ Excludes2

inherited

Rules inherited from parent codes.

S66.1

• Injury of long flexor muscle, fascia and tendon of thumb at wrist and hand level (S66.0-)

S66

• sprain of joints and ligaments of wrist and hand (S63.-)

Child Codes (3)

S66.108AUnspecified injury of flexor muscle, fascia and tendon of other finger at wrist and hand level, initial encounter✓ Billable S66.108DUnspecified injury of flexor muscle, fascia and tendon of other finger at wrist and hand level, subsequent encounter✓ Billable S66.108SUnspecified injury of flexor muscle, fascia and tendon of other finger at wrist and hand level, sequela✓ Billable

Clinical Description

ICD-10-CM code S66.108 represents unspecified injury of flexor muscle, fascia and tendon of other finger at wrist and hand level. This code falls under the Injury, poisoning and certain other consequences of external causes (S00-T88) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 7-character code at the 6th level of specificity. There are 3 more specific child codes under S66.108.

Frequently Asked Questions

What is ICD-10 code S66.108?

ICD-10-CM code S66.108 is "Unspecified injury of flexor muscle, fascia and tendon of other finger at wrist and hand level". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).

Is S66.108 a billable ICD-10 code?

No, S66.108 is a non-billable header code. A more specific child code must be used for billing.

Can S66.108 be coded with other codes?

S66.108 has 2 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in S66.10

Other codes in the same category that may be relevant for differential coding:

S66.100Unspecified injury of flexor muscle, fascia and tendon of right index finger at wrist and hand level S66.101Unspecified injury of flexor muscle, fascia and tendon of left index finger at wrist and hand level S66.102Unspecified injury of flexor muscle, fascia and tendon of right middle finger at wrist and hand level S66.103Unspecified injury of flexor muscle, fascia and tendon of left middle finger at wrist and hand level S66.104Unspecified injury of flexor muscle, fascia and tendon of right ring finger at wrist and hand level S66.105Unspecified injury of flexor muscle, fascia and tendon of left ring finger at wrist and hand level S66.106Unspecified injury of flexor muscle, fascia and tendon of right little finger at wrist and hand level S66.107Unspecified injury of flexor muscle, fascia and tendon of left little finger at wrist and hand level S66.109Unspecified injury of flexor muscle, fascia and tendon of unspecified finger at wrist and hand level

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Code Information

CodeS66.108

BillableNo — Header code

ParentS66.10

CategoryInjury, poisoning and certain other consequences of external causes (S00-T88)

Excludes10 rule(s)

Excludes22 note(s)

Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)