T81.522A vs T81.522D

T81.522A (Obstruction due to foreign body accidentally left in body following kidney dialysis, initial encounter) compared with T81.522D (Obstruction due to foreign body accidentally left in body following kidney dialysis, subsequent encounter), from the official CMS tabular data. T81.522A and T81.522D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T81.522A

Initial encounter

Obstruction due to foreign body accidentally left in body following kidney dialysis, initial encounter

↔

T81.522D

Subsequent encounter

Obstruction due to foreign body accidentally left in body following kidney dialysis, 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. T81.522A and T81.522D 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

	T81.522AObstruction due to foreign body accidentally left in body following kidney dialysis, initial encounter	T81.522DObstruction due to foreign body accidentally left in body following kidney dialysis, 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	Obstruction due to foreign body accidentally left in body following kidney dialysis, initial encounter is a billable ICD-10-CM diagnosis code (T81.522A).	Obstruction due to foreign body accidentally left in body following kidney dialysis, subsequent encounter is a billable ICD-10-CM diagnosis code (T81.522D).
7th character	The appropriate 7th character is to be added to each code from category T81	The appropriate 7th character is to be added to each code from category T81
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