T78.080UpcomingCategory · further specificity required

Anaphylactic reaction due to egg with tolerance to baked egg

Code-level instructions

Excludes 1

Anaphylactic reaction due to egg with reactivity to baked egg (T78.081)

Chapters 19 · Inherited instructions

Use additional code

code to identify any retained foreign body, if applicable (Z18.-)

T66-T78 · Inherited instructions

Code also

, if applicable, place of occurrence, such as:
highway rest stop (Y92.523)
school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
service areas as the place of occurrence of the external cause (Y92.52-)
single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
transport vehicle as the place of occurrence of the external cause (Y92.81-)

T78 · Inherited instructions

A — initial encounter

D — subsequent encounter

S — sequela

Excludes 2 · 3

Chapters 19 · Injury, poisoning and certain other consequences of external causes (S00-T88)

Excludes 2

birth trauma (P10-P15)
obstetric trauma (O70-O71)

T78 · Adverse effects, not elsewhere classified

Excludes 2

complications of surgical and medical care NEC (T80-T88)

More specific codes

T78.080AAnaphylactic reaction due to egg with tolerance to baked egg, initial encounter T78.080DAnaphylactic reaction due to egg with tolerance to baked egg, subsequent encounter T78.080SAnaphylactic reaction due to egg with tolerance to baked egg, sequela

Claims & coverage

When ICD-10-CM is required

For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.

Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.

Official coding guidelines → · CMS ↗

First observed · 2025-10-01

Code history

Latest recorded change · FY2026 · April

ChangedUnchanged

FY2026 · April

Effective from 2026-04-01

Inherited rules changed

Anaphylactic reaction due to egg with tolerance to baked egg

Category — select a more specific code

CDC/NCHS · FY2026 · April

All editions (3)

All editions	Effective from	Code history
FY2026	2025-10-01	Added
FY2026 · April	2026-04-01	Inherited rules changed
FY2027	2026-10-01	No tabular change

Code-level instructions

Excludes 1

Anaphylactic reaction due to egg with reactivity to baked egg (T78.081)

Inherited instructions

Chapters 19 · Injury, poisoning and certain other consequences of external causes (S00-T88)

Excludes 2

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Use additional code

code to identify any retained foreign body, if applicable (Z18.-)

Note

Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

T66-T78 · Other and unspecified effects of external causes (T66-T78)

Code also

, if applicable, place of occurrence, such as:
highway rest stop (Y92.523)
school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
service areas as the place of occurrence of the external cause (Y92.52-)
single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
transport vehicle as the place of occurrence of the external cause (Y92.81-)

T78 · Adverse effects, not elsewhere classified

Excludes 2

complications of surgical and medical care NEC (T80-T88)

Seventh character

The appropriate 7th character is to be added to each code from category T78

A — initial encounter

D — subsequent encounter

S — sequela

T78.0 · Anaphylactic reaction due to food

Inclusion terms

Anaphylactic reaction due to adverse food reaction
Anaphylactic shock or reaction due to nonpoisonous foods
Anaphylactoid reaction due to food

More specific codes

T78.080AAnaphylactic reaction due to egg with tolerance to baked egg, initial encounterBillable / specific T78.080DAnaphylactic reaction due to egg with tolerance to baked egg, subsequent encounterBillable / specific T78.080SAnaphylactic reaction due to egg with tolerance to baked egg, sequelaBillable / specific

Official index references (2)

Allergy, allergic(reaction) (to) (1)

Allergy, allergic(reaction) (to) › eggs › anaphylactic reaction › with › tolerance to baked eggDisease index

Shock (1)

Shock › anaphylactic › due to food(nonpoisonous) › eggs › with › tolerance to baked eggDisease index

Related codes

Other entries in the same category; these are not automatic substitutes.

Code	Description	Category · further specificity required
T78.081	Anaphylactic reaction due to egg with reactivity to baked egg	Category · further specificity required
T78.089	Anaphylactic reaction due to eggs, unspecified	Category · further specificity required

Official titles and instructions are preserved in their source language. Official sources ↗

References from other codes (1)

T78.081 · Anaphylactic reaction due to egg with reactivity to baked egg

Excludes 1 · Anaphylactic reaction due to egg with tolerance to baked egg (T78.080)

T78.080UpcomingCategory · further specificity required

Anaphylactic reaction due to egg with tolerance to baked egg

Code-level instructions

Excludes 1

Anaphylactic reaction due to egg with reactivity to baked egg (T78.081)

Chapters 19 · Inherited instructions

Use additional code

code to identify any retained foreign body, if applicable (Z18.-)

T66-T78 · Inherited instructions

Code also

, if applicable, place of occurrence, such as:
highway rest stop (Y92.523)
school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
service areas as the place of occurrence of the external cause (Y92.52-)
single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
transport vehicle as the place of occurrence of the external cause (Y92.81-)

T78 · Inherited instructions

A — initial encounter

D — subsequent encounter

S — sequela

Excludes 2 · 3

Chapters 19 · Injury, poisoning and certain other consequences of external causes (S00-T88)

Excludes 2

birth trauma (P10-P15)
obstetric trauma (O70-O71)

T78 · Adverse effects, not elsewhere classified

Excludes 2

complications of surgical and medical care NEC (T80-T88)

More specific codes

Claims & coverage

When ICD-10-CM is required

For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.

Official coding guidelines → · CMS ↗

First observed · 2025-10-01

Code history

Latest recorded change · FY2026 · April

ChangedUnchanged

FY2026 · April

Effective from 2026-04-01

Inherited rules changed

Anaphylactic reaction due to egg with tolerance to baked egg

Category — select a more specific code

CDC/NCHS · FY2026 · April

All editions (3)

All editions	Effective from	Code history
FY2026	2025-10-01	Added
FY2026 · April	2026-04-01	Inherited rules changed
FY2027	2026-10-01	No tabular change

Code-level instructions

Excludes 1

Anaphylactic reaction due to egg with reactivity to baked egg (T78.081)

Inherited instructions

Chapters 19 · Injury, poisoning and certain other consequences of external causes (S00-T88)

Excludes 2

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Use additional code

code to identify any retained foreign body, if applicable (Z18.-)

Note

Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

T66-T78 · Other and unspecified effects of external causes (T66-T78)

Code also

, if applicable, place of occurrence, such as:
highway rest stop (Y92.523)
school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
service areas as the place of occurrence of the external cause (Y92.52-)
single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
transport vehicle as the place of occurrence of the external cause (Y92.81-)

T78 · Adverse effects, not elsewhere classified

Excludes 2

complications of surgical and medical care NEC (T80-T88)

Seventh character

The appropriate 7th character is to be added to each code from category T78

A — initial encounter

D — subsequent encounter

S — sequela

T78.0 · Anaphylactic reaction due to food

Inclusion terms

Anaphylactic reaction due to adverse food reaction
Anaphylactic shock or reaction due to nonpoisonous foods
Anaphylactoid reaction due to food

More specific codes

Official index references (2)

Allergy, allergic(reaction) (to) (1)

Allergy, allergic(reaction) (to) › eggs › anaphylactic reaction › with › tolerance to baked eggDisease index

Shock (1)

Shock › anaphylactic › due to food(nonpoisonous) › eggs › with › tolerance to baked eggDisease index

Related codes

Other entries in the same category; these are not automatic substitutes.

Code	Description	Category · further specificity required
T78.081	Anaphylactic reaction due to egg with reactivity to baked egg	Category · further specificity required
T78.089	Anaphylactic reaction due to eggs, unspecified	Category · further specificity required

Official titles and instructions are preserved in their source language. Official sources ↗

References from other codes (1)

T78.081 · Anaphylactic reaction due to egg with reactivity to baked egg

Excludes 1 · Anaphylactic reaction due to egg with tolerance to baked egg (T78.080)