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S66.922S vs S66.929S

S66.922S (Laceration of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela) compared with S66.929S (Laceration of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, sequela), from the official CMS tabular data.

Summary

These codes name the same condition on opposite sides of the body, so the documented side decides which one applies.

MedCoder-derived
What is different?

Title wording.The titles differ in one word, “left” (S66.922S) versus “unspecified” (S66.929S): S66.922S is “Laceration of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela”; S66.929S is “Laceration of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, sequela”.

Registry fact

Can these codes be reported together?

One side per condition.S66.922S and S66.929S 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.

MedCoder-derivedGuide: Laterality coding

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code.

Official rule

Is there an Excludes2 relationship?

None.Neither entry carries an Excludes2 note that names the other code. S66.922S carries 4 Excludes2 notes and S66.929S carries 4 Excludes2 notes covering other codes; the side-by-side table quotes them.

Official rule

Is one more specific?

No.Both titles are unspecified forms within category S66, and neither is a subdivision of the other.

Registry fact

Is one a parent or header code?

No.Both are billable codes, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

Yes.Same condition, opposite side. S66.922S and S66.929S name the same condition on opposite sides of the body.

MedCoder-derivedGuide: Laterality coding

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule.

Can these codes be reported together?

Review

Laterality relationship

S66.922S
Left
Laceration of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela
↔
S66.929S
Unspecified
Laceration of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, sequela

What we found

Same condition, opposite side.S66.922S and S66.929S 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.

What to review

Report the side the documentation names. Where the code set provides a bilateral code and both sides are documented, use it instead of the pair.

Guide: Laterality codingCheck these on a claim

Why it matters

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 / rule

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

Side by side

S66.922SLaceration of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequelaS66.929SLaceration of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, sequela
Billing statusBillableBillable
ClassificationS00-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)
DefinitionLaceration of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela is a billable ICD-10-CM diagnosis code (S66.922S).Laceration of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, sequela is a billable ICD-10-CM diagnosis code (S66.929S).
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
Excludes2
sprain of joints and ligaments of wrist and hand (S63.-)
burns and corrosions (T20-T32)
frostbite (T33-T34)
insect bite or sting, venomous (T63.4)
sprain of joints and ligaments of wrist and hand (S63.-)
burns and corrosions (T20-T32)
frostbite (T33-T34)
insect bite or sting, venomous (T63.4)
Code also
any associated open wound (S61.-)
any associated open wound (S61.-)

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2026). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources