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S96.991A vs S96.999A

S96.991A (Other specified injury of unspecified muscle and tendon at ankle and foot level, right foot, initial encounter) compared with S96.999A (Other specified injury of unspecified muscle and tendon at ankle and foot level, unspecified foot, initial encounter), from the official CMS tabular data. S96.991A and S96.999A code the same condition on opposite sides. MedCoder-derived

Relationship

Review

Laterality relationship

S96.991A
Right
Other specified injury of unspecified muscle and tendon at ankle and foot level, right foot, initial encounter
S96.999A
Unspecified
Other specified injury of unspecified muscle and tendon at ankle and foot level, unspecified foot, initial encounter

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. S96.991A and S96.999A 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

S96.991AOther specified injury of unspecified muscle and tendon at ankle and foot level, right foot, initial encounterS96.999AOther specified injury of unspecified muscle and tendon at ankle and foot level, unspecified foot, initial encounter
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 specified injury of unspecified muscle and tendon at ankle and foot level, right foot, initial encounter is a billable ICD-10-CM diagnosis code (S96.991A).Other specified injury of unspecified muscle and tendon at ankle and foot level, unspecified foot, initial encounter is a billable ICD-10-CM diagnosis code (S96.999A).
7th characterThe appropriate 7th character is to be added to each code from category S96The appropriate 7th character is to be added to each code from category S96

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