S45.201A vs S45.201D

S45.201A (Unspecified injury of axillary or brachial vein, right side, initial encounter) compared with S45.201D (Unspecified injury of axillary or brachial vein, right side, subsequent encounter), from the official CMS tabular data. S45.201A and S45.201D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S45.201A

Initial encounter

Unspecified injury of axillary or brachial vein, right side, initial encounter

↔

S45.201D

Subsequent encounter

Unspecified injury of axillary or brachial vein, right 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. S45.201A and S45.201D 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

	S45.201AUnspecified injury of axillary or brachial vein, right side, initial encounter	S45.201DUnspecified injury of axillary or brachial vein, right side, subsequent encounter
Billing status	Billable	Billable
Classification	S00-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)
Definition	Unspecified injury of axillary or brachial vein, right side, initial encounter is a billable ICD-10-CM diagnosis code (S45.201A).	Unspecified injury of axillary or brachial vein, right side, subsequent encounter is a billable ICD-10-CM diagnosis code (S45.201D).
7th character	The appropriate 7th character is to be added to each code from category S45	The appropriate 7th character is to be added to each code from category S45
Includes	injuries of axilla injuries of scapular region	injuries of axilla injuries of scapular region

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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