ICD-10-CM Codes
S00-T88 Injury, poisoning and certain other consequences of external causes
T66-T78 Other and unspecified effects of external causes
T78- Adverse effects, not elsewhere classified
2021 ICD-10-CM Diagnosis Code T78.1

2021 ICD-10-CM Diagnosis Code T78.1

Other adverse food reactions, not elsewhere classified

2016

2017

2018

2019

2020

2021

Non-Billable/Non-Specific Code

T78.1 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
The 2021 edition of ICD-10-CM T78.1 became effective on October 1, 2020.
This is the American ICD-10-CM version of T78.1 - other international versions of ICD-10 T78.1 may differ.

Use Additional

Use Additional Help

Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.

code to identify the type of reaction, if applicable

Type 1 Excludes

Type 1 Excludes Help

A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as T78.1. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

anaphylactic reaction or shock due to adverse food reaction (
ICD-10-CM Diagnosis Code T78.0
Anaphylactic reaction due to food
Applicable To
- Anaphylactic reaction due to adverse food reaction
- Anaphylactic shock or reaction due to nonpoisonous foods
- Anaphylactoid reaction due to food
T78.0-
)
anaphylactic reaction due to food (
ICD-10-CM Diagnosis Code T78.0
Anaphylactic reaction due to food
Applicable To
- Anaphylactic reaction due to adverse food reaction
- Anaphylactic shock or reaction due to nonpoisonous foods
- Anaphylactoid reaction due to food
T78.0-
)
bacterial food borne intoxications (
ICD-10-CM Diagnosis Code A05
- A05 Other bacterial foodborne intoxications, not ...
  - A05.0 Foodborne staphylococcal intoxication
  - A05.1 Botulism food poisoning
  - A05.2 Foodborne Clostridium perfringens [Clostridiu...
  - A05.3 Foodborne Vibrio parahaemolyticus intoxicatio...
  - A05.4 Foodborne Bacillus cereus intoxication
  - A05.5 Foodborne Vibrio vulnificus intoxication
  - A05.8 Other specified bacterial foodborne intoxicat...
  - A05.9 Bacterial foodborne intoxication, unspecified...
A05.-
)

Type 2 Excludes

Type 2 Excludes Help

A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (T78.1) and the excluded code together.

allergic and dietetic gastroenteritis and colitis (
ICD-10-CM Diagnosis Code K52.29
Other allergic and dietetic gastroenteritis and colitis
Applicable To
- Food hypersensitivity gastroenteritis or colitis
- Immediate gastrointestinal hypersensitivity
K52.29
)
allergic rhinitis due to food (
ICD-10-CM Diagnosis Code J30.5
Allergic rhinitis due to food
J30.5
)
dermatitis due to food in contact with skin (
ICD-10-CM Diagnosis Code L23.6
Allergic contact dermatitis due to food in contact with the skin
Type 2 Excludes
- dermatitis due to ingested food (L27.2)
L23.6
,
ICD-10-CM Diagnosis Code L24.6
Irritant contact dermatitis due to food in contact with skin
Type 2 Excludes
- dermatitis due to ingested food (L27.2)
L24.6
,
ICD-10-CM Diagnosis Code L25.4
Unspecified contact dermatitis due to food in contact with skin
Type 2 Excludes
- dermatitis due to ingested food (L27.2)
L25.4
)
dermatitis due to ingested food (
ICD-10-CM Diagnosis Code L27.2
Dermatitis due to ingested food
Type 2 Excludes
- dermatitis due to food in contact with skin (L23.6, L24.6, L25.4)
L27.2
)
food protein-induced enterocolitis syndrome (
ICD-10-CM Diagnosis Code K52.21
Food protein-induced enterocolitis syndrome
Applicable To
- FPIES
Use Additional
- code for hypovolemic shock, if present (R57.1)
K52.21
)
food protein-induced enteropathy (
ICD-10-CM Diagnosis Code K52.22
Food protein-induced enteropathy
K52.22
)

The following code(s) above T78.1 contain annotation back-references

Annotation Back-References

In this context, annotation back-references refer to codes that contain:

Applicable To annotations, or
Code Also annotations, or
Code First annotations, or
Excludes1 annotations, or
Excludes2 annotations, or
Includes annotations, or
Note annotations, or
Use Additional annotations

that may be applicable to T78.1:

S00-T88
2021 ICD-10-CM Range S00-T88
Injury, poisoning and certain other consequences of external causes
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
Type 1 Excludes
- birth trauma (P10-P15)
- obstetric trauma (O70-O71)
Use Additional
- code to identify any retained foreign body, if applicable (Z18.-)
Injury, poisoning and certain other consequences of external causes
T78
ICD-10-CM Diagnosis Code T78
Adverse effects, not elsewhere classified
Type 2 Excludes
- complications of surgical and medical care NEC (T80-T88)
Adverse effects, not elsewhere classified

Approximate Synonyms

Food allergy

Code History

2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
2017 (effective 10/1/2016): No change
2018 (effective 10/1/2017): No change
2019 (effective 10/1/2018): No change
2020 (effective 10/1/2019): No change
2021 (effective 10/1/2020): No change

Code annotations containing back-references to T78.1:

Type 2 Excludes: L27

ICD-10-CM Diagnosis Code L27
Dermatitis due to substances taken internally
Type 1 Excludes
- allergy NOS (T78.40)
Type 2 Excludes
- adverse food reaction, except dermatitis (T78.0-T78.1)
- contact dermatitis (L23-L25)
- drug photoallergic response (L56.1)
- drug phototoxic response (L56.0)
- urticaria (L50.-)

Diagnosis Index entries containing back-references to T78.1:

Allergy, allergic (reaction) (to) T78.40
ICD-10-CM Diagnosis Code T78.40
Allergy, unspecified
Applicable To
Allergic reaction NOS
Hypersensitivity NOS
- food (any) (ingested) T78.1
- gastrointestinal - see also specific type of allergic reaction
  - meaning other adverse food reaction not elsewhere classified T78.1
Effect, adverse
- foodstuffs T78.1
Reaction - see also Disorder
- adverse
  - food (any) (ingested) T78.1
Syndrome - see also Disease
- oral allergy T78.1

ICD-10-CM Codes Adjacent To T78.1

T78.07XD …… subsequent encounter

T78.07XS …… sequela

T78.08 Anaphylactic reaction due to eggs

T78.08XA …… initial encounter

T78.08XD …… subsequent encounter

T78.08XS …… sequela

T78.09 Anaphylactic reaction due to other food products

T78.09XA …… initial encounter

T78.09XD …… subsequent encounter

T78.09XS …… sequela

T78.1 Other adverse food reactions, not elsewhere classified

T78.1XXA …… initial encounter

T78.1XXD …… subsequent encounter

T78.1XXS …… sequela

T78.2 Anaphylactic shock, unspecified

T78.2XXA …… initial encounter

T78.2XXD …… subsequent encounter

T78.2XXS …… sequela

T78.3 Angioneurotic edema

T78.3XXA …… initial encounter

T78.3XXD …… subsequent encounter

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

2021 ICD-10-CM Diagnosis Code T78.1

Other adverse food reactions, not elsewhere classified

Anaphylactic reaction due to food

Anaphylactic reaction due to food

Other allergic and dietetic gastroenteritis and colitis

Allergic rhinitis due to food

Allergic contact dermatitis due to food in contact with the skin

Irritant contact dermatitis due to food in contact with skin

Unspecified contact dermatitis due to food in contact with skin

Dermatitis due to ingested food

Food protein-induced enterocolitis syndrome

Food protein-induced enteropathy

Injury, poisoning and certain other consequences of external causes

Adverse effects, not elsewhere classified

Dermatitis due to substances taken internally

Allergy, unspecified