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S66.512 vs S66.513

S66.512 (Strain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level) compared with S66.513 (Strain of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level), from the official CMS tabular data. S66.512 and S66.513 code the same condition on opposite sides. MedCoder-derived

Relationship

Review

Laterality relationship

S66.512
Right
Strain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level
↔
S66.513
Left
Strain of intrinsic muscle, fascia and tendon of left middle 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. S66.512 and S66.513 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

S66.512Strain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand levelS66.513Strain of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level
Billing statusNon-billable header

Report instead: S66.512A, S66.512D, S66.512S

Non-billable header

Report instead: S66.513A, S66.513D, S66.513S

ClassificationS00-T88 — Injury, poisoning and certain other consequences of external causesS00-T88 — Injury, poisoning and certain other consequences of external causes
DefinitionStrain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level is a non-billable ICD-10-CM category code (S66.512).Strain of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level is a non-billable ICD-10-CM category code (S66.513).
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