S42.345A vs S42.346A

S42.345A (Nondisplaced spiral fracture of shaft of humerus, left arm, initial encounter for closed fracture) compared with S42.346A (Nondisplaced spiral fracture of shaft of humerus, unspecified arm, initial encounter for closed fracture), from the official CMS tabular data. S42.345A and S42.346A code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S42.345A

Left

Nondisplaced spiral fracture of shaft of humerus, left arm, initial encounter for closed fracture

↔

S42.346A

Unspecified

Nondisplaced spiral fracture of shaft of humerus, unspecified arm, initial encounter for closed fracture

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. S42.345A and S42.346A 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

	S42.345ANondisplaced spiral fracture of shaft of humerus, left arm, initial encounter for closed fracture	S42.346ANondisplaced spiral fracture of shaft of humerus, unspecified arm, initial encounter for closed fracture
Billing status	Billable	Billable
Classification	S00-T88 — Injury, poisoning and certain other consequences of external causes	S00-T88 — Injury, poisoning and certain other consequences of external causes
Definition	Nondisplaced spiral fracture of shaft of humerus, left arm, initial encounter for closed fracture is a billable ICD-10-CM diagnosis code (S42.345A).	Nondisplaced spiral fracture of shaft of humerus, unspecified arm, initial encounter for closed fracture is a billable ICD-10-CM diagnosis code (S42.346A).
7th character	The appropriate 7th character is to be added to all codes from category S42	The appropriate 7th character is to be added to all codes from category S42
Includes	injuries of axilla injuries of scapular region	injuries of axilla injuries of scapular region

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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