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S52.391M vs S52.399M

S52.391M (Other fracture of shaft of radius, right arm, subsequent encounter for open fracture type I or II with nonunion) compared with S52.399M (Other fracture of shaft of radius, unspecified arm, subsequent encounter for open fracture type I or II with nonunion), from the official CMS tabular data. S52.391M and S52.399M code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S52.391M
Right
Other fracture of shaft of radius, right arm, subsequent encounter for open fracture type I or II with nonunion
S52.399M
Unspecified
Other fracture of shaft of radius, unspecified arm, subsequent encounter for open fracture type I or II with nonunion

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. S52.391M and S52.399M 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

S52.391MOther fracture of shaft of radius, right arm, subsequent encounter for open fracture type I or II with nonunionS52.399MOther fracture of shaft of radius, unspecified arm, subsequent encounter for open fracture type I or II with nonunion
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)
DefinitionOther fracture of shaft of radius, right arm, subsequent encounter for open fracture type I or II with nonunion is a billable ICD-10-CM diagnosis code (S52.391M).Other fracture of shaft of radius, unspecified arm, subsequent encounter for open fracture type I or II with nonunion is a billable ICD-10-CM diagnosis code (S52.399M).
7th characterThe appropriate 7th character is to be added to all codes from category S52The appropriate 7th character is to be added to all codes from category S52

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources