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S66.126 vs S66.127

S66.126 (Laceration of flexor muscle, fascia and tendon of right little finger at wrist and hand level) compared with S66.127 (Laceration of flexor muscle, fascia and tendon of left little finger at wrist and hand level), from the official CMS tabular data. S66.126 and S66.127 code the same condition on opposite sides. MedCoder-derived

Relationship

Review

Laterality relationship

S66.126
Right
Laceration of flexor muscle, fascia and tendon of right little finger at wrist and hand level
↔
S66.127
Left
Laceration of flexor muscle, fascia and tendon of left little finger at wrist and hand level

Same condition; these differ only in which side is documented.

These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.

Source: ICD-10-CM tabular list (laterality variant derived from the code title)

Can these codes be reported together?

Same condition, opposite side. S66.126 and S66.127 name the same condition on opposite sides of the body.

Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

Side by side

S66.126Laceration of flexor muscle, fascia and tendon of right little finger at wrist and hand levelS66.127Laceration of flexor muscle, fascia and tendon of left little finger at wrist and hand level
Billing statusNon-billable header

Report instead: S66.126A, S66.126D, S66.126S

Non-billable header

Report instead: S66.127A, S66.127D, S66.127S

ClassificationS00-T88 — Injury, poisoning and certain other consequences of external causesS00-T88 — Injury, poisoning and certain other consequences of external causes
DefinitionLaceration of flexor muscle, fascia and tendon of right little finger at wrist and hand level is a non-billable ICD-10-CM category code (S66.126).Laceration of flexor muscle, fascia and tendon of left little finger at wrist and hand level is a non-billable ICD-10-CM category code (S66.127).
7th characterThe appropriate 7th character is to be added to each code from category S66The appropriate 7th character is to be added to each code from category S66
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources