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S25.399A vs S25.399D

S25.399A (Other specified injury of unspecified innominate or subclavian vein, initial encounter) compared with S25.399D (Other specified injury of unspecified innominate or subclavian vein, subsequent encounter), from the official CMS tabular data. S25.399A and S25.399D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S25.399A
Initial encounter
Other specified injury of unspecified innominate or subclavian vein, initial encounter
↔
S25.399D
Subsequent encounter
Other specified injury of unspecified innominate or subclavian vein, 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. S25.399A and S25.399D 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

S25.399AOther specified injury of unspecified innominate or subclavian vein, initial encounterS25.399DOther specified injury of unspecified innominate or subclavian vein, 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 unspecified innominate or subclavian vein, initial encounter is a billable ICD-10-CM diagnosis code (S25.399A).Other specified injury of unspecified innominate or subclavian vein, subsequent encounter is a billable ICD-10-CM diagnosis code (S25.399D).
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