S46.821A vs S46.821D

S46.821A (Laceration of other muscles, fascia and tendons at shoulder and upper arm level, right arm, initial encounter) compared with S46.821D (Laceration of other muscles, fascia and tendons at shoulder and upper arm level, right arm, subsequent encounter), from the official CMS tabular data. S46.821A and S46.821D code the same injury at a different phase of treatment. MedCoder-derived

Relationship

Review

Encounter relationship

S46.821A

Initial encounter

Laceration of other muscles, fascia and tendons at shoulder and upper arm level, right arm, initial encounter

↔

S46.821D

Subsequent encounter

Laceration of other muscles, fascia and tendons at shoulder and upper arm level, right arm, 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. S46.821A and S46.821D 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

	S46.821ALaceration of other muscles, fascia and tendons at shoulder and upper arm level, right arm, initial encounter	S46.821DLaceration of other muscles, fascia and tendons at shoulder and upper arm level, right arm, 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	Laceration of other muscles, fascia and tendons at shoulder and upper arm level, right arm, initial encounter is a billable ICD-10-CM diagnosis code (S46.821A).	Laceration of other muscles, fascia and tendons at shoulder and upper arm level, right arm, subsequent encounter is a billable ICD-10-CM diagnosis code (S46.821D).
7th character	The appropriate 7th character is to be added to each code from category S46	The appropriate 7th character is to be added to each code from category S46
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