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S25.509A vs S25.509D

S25.509A (Unspecified injury of intercostal blood vessels, unspecified side, initial encounter) compared with S25.509D (Unspecified injury of intercostal blood vessels, unspecified side, subsequent encounter), from the official CMS tabular data. S25.509A and S25.509D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S25.509A
Initial encounter
Unspecified injury of intercostal blood vessels, unspecified side, initial encounter
↔
S25.509D
Subsequent encounter
Unspecified injury of intercostal blood vessels, unspecified side, 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. S25.509A and S25.509D 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

S25.509AUnspecified injury of intercostal blood vessels, unspecified side, initial encounterS25.509DUnspecified injury of intercostal blood vessels, unspecified side, 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)
DefinitionUnspecified injury of intercostal blood vessels, unspecified side, initial encounter is a billable ICD-10-CM diagnosis code (S25.509A).Unspecified injury of intercostal blood vessels, unspecified side, subsequent encounter is a billable ICD-10-CM diagnosis code (S25.509D).
7th characterThe appropriate 7th character is to be added to each code from category S25The appropriate 7th character is to be added to each code from category S25
Includes
injuries of breast
injuries of chest (wall)
injuries of interscapular area
injuries of breast
injuries of chest (wall)
injuries of interscapular area
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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