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S85.299A vs S85.299D

S85.299A (Other specified injury of peroneal artery, unspecified leg, initial encounter) compared with S85.299D (Other specified injury of peroneal artery, unspecified leg, subsequent encounter), from the official CMS tabular data. S85.299A and S85.299D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S85.299A
Initial encounter
Other specified injury of peroneal artery, unspecified leg, initial encounter
S85.299D
Subsequent encounter
Other specified injury of peroneal artery, unspecified leg, subsequent encounter

Same underlying diagnosis, different encounter phase.

The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.

Source: ICD-10-CM Official Guidelines, Section I.C.19.a

Can these codes be reported together?

Same injury, other encounter phase. S85.299A and S85.299D code the same injury at a different phase of treatment, set by the 7th character.

The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.

Side by side

S85.299AOther specified injury of peroneal artery, unspecified leg, initial encounterS85.299DOther specified injury of peroneal artery, unspecified leg, subsequent 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 peroneal artery, unspecified leg, initial encounter is a billable ICD-10-CM diagnosis code (S85.299A).Other specified injury of peroneal artery, unspecified leg, subsequent encounter is a billable ICD-10-CM diagnosis code (S85.299D).
7th characterThe appropriate 7th character is to be added to each code from category S85The appropriate 7th character is to be added to each code from category S85

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