T80.919A vs T80.919D

T80.919A (Hemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed, initial encounter) compared with T80.919D (Hemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed, subsequent encounter), from the official CMS tabular data. T80.919A and T80.919D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T80.919A

Initial encounter

Hemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed, initial encounter

↔

T80.919D

Subsequent encounter

Hemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed, 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. T80.919A and T80.919D 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

	T80.919AHemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed, initial encounter	T80.919DHemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed, 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	Hemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed, initial encounter is a billable ICD-10-CM diagnosis code (T80.919A).	Hemolytic transfusion reaction, unspecified incompatibility, unspecified as acute or delayed, subsequent encounter is a billable ICD-10-CM diagnosis code (T80.919D).
7th character	The appropriate 7th character is to be added to each code from category T80	The appropriate 7th character is to be added to each code from category T80
Includes	complications following perfusion Hemolytic transfusion reaction NOS	complications following perfusion Hemolytic transfusion reaction NOS
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