T84.9XXA vs T84.9XXD

T84.9XXA (Unspecified complication of internal orthopedic prosthetic device, implant and graft, initial encounter) compared with T84.9XXD (Unspecified complication of internal orthopedic prosthetic device, implant and graft, subsequent encounter), from the official CMS tabular data. T84.9XXA and T84.9XXD code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T84.9XXA

Initial encounter

Unspecified complication of internal orthopedic prosthetic device, implant and graft, initial encounter

↔

T84.9XXD

Subsequent encounter

Unspecified complication of internal orthopedic prosthetic device, implant and graft, 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. T84.9XXA and T84.9XXD 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

	T84.9XXAUnspecified complication of internal orthopedic prosthetic device, implant and graft, initial encounter	T84.9XXDUnspecified complication of internal orthopedic prosthetic device, implant and graft, 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 complication of internal orthopedic prosthetic device, implant and graft, initial encounter is a billable ICD-10-CM diagnosis code (T84.9A).	Unspecified complication of internal orthopedic prosthetic device, implant and graft, subsequent encounter is a billable ICD-10-CM diagnosis code (T84.9D).
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 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 devices involved and details of circumstances (Y62-Y82)	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 devices involved and details of circumstances (Y62-Y82)

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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