T84.610A vs T84.610S

T84.610A (Infection and inflammatory reaction due to internal fixation device of right humerus, initial encounter) compared with T84.610S (Infection and inflammatory reaction due to internal fixation device of right humerus, sequela), from the official CMS tabular data. T84.610A and T84.610S code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T84.610A

Initial encounter

Infection and inflammatory reaction due to internal fixation device of right humerus, initial encounter

↔

T84.610S

Sequela

Infection and inflammatory reaction due to internal fixation device of right humerus, sequela

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. T84.610A and T84.610S 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

	T84.610AInfection and inflammatory reaction due to internal fixation device of right humerus, initial encounter	T84.610SInfection and inflammatory reaction due to internal fixation device of right humerus, sequela
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	Infection and inflammatory reaction due to internal fixation device of right humerus, initial encounter is a billable ICD-10-CM diagnosis code (T84.610A).	Infection and inflammatory reaction due to internal fixation device of right humerus, sequela is a billable ICD-10-CM diagnosis code (T84.610S).
7th character	The appropriate 7th character is to be added to each code from category T84	The appropriate 7th character is to be added to each code from category T84
Use additional code	code to identify infection code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) code(s) to identify the specified condition resulting from the complication	code to identify infection code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) code(s) to identify the specified condition resulting from the complication

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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