S42.311A vs S42.312A

S42.311A (Greenstick fracture of shaft of humerus, right arm, initial encounter for closed fracture) compared with S42.312A (Greenstick fracture of shaft of humerus, left arm, initial encounter for closed fracture), from the official CMS tabular data. S42.311A and S42.312A code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S42.311A

Right

Greenstick fracture of shaft of humerus, right arm, initial encounter for closed fracture

↔

S42.312A

Left

Greenstick fracture of shaft of humerus, left 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. S42.311A and S42.312A 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

	S42.311AGreenstick fracture of shaft of humerus, right arm, initial encounter for closed fracture	S42.312AGreenstick fracture of shaft of humerus, left arm, initial encounter for closed fracture
Billing status	Billable	Billable
Classification	S00-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)
Definition	Greenstick fracture of shaft of humerus, right arm, initial encounter for closed fracture is a billable ICD-10-CM diagnosis code (S42.311A).	Greenstick fracture of shaft of humerus, left arm, initial encounter for closed fracture is a billable ICD-10-CM diagnosis code (S42.312A).
7th character	The appropriate 7th character is to be added to all codes in subcategory S42.31	The appropriate 7th character is to be added to all codes in subcategory S42.31
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