ICD-10-CM Code T78.4
Other and unspecified allergy
Non-Billable Code
Non-Billable means the code is not sufficient justification for admission to an acute care hospital when used a principal diagnosis. Use a child code to capture more detail.ICD Code T78.4 is a non-billable code. To code a diagnosis of this type, you must use one of the three child codes of T78.4 that describes the diagnosis 'other and unspecified allergy' in more detail.
- T78.4 Other and unspecified allergy NON-BILLABLE
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The ICD code T784 is used to code Idiosyncratic drug reaction
Idiosyncratic drug reactions, also known as type B reactions, are drug reactions that occur rarely and unpredictably amongst the population. This is not to be mistaken with idiopathic, which implies that the cause is not known. They frequently occur with exposure to new drugs, as they have not been fully tested and the full range of possible side-effects have not been discovered; they may also be listed as an adverse drug reaction with a drug, but are extremely rare.
| Specialty: | Emergency Medicine |
| MeSH Codes: | , D018777, D018777, D001183, D006967 |
| ICD 9 Codes: | 995.3, 300, 995.3, 995.21, 995.3 |
Coding Notes for T78.4 Info for medical coders on how to properly use this ICD-10 code
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Code Type-1 Excludes:
Type-1 Excludes
Type-1 Excludes mean the conditions excluded are mutually exclusive and should never be coded together. Excludes 1 means "do not code here." - Specified types of allergic reaction such as:
- Allergic diarrhea - instead, use code K52.2
- Allergic gastroenteritis and colitis - instead, use code K52.2
- Dermatitis - instead, use Section L23-L25, L27.-)
- Hay fever - instead, use code J30.1
ICD-10-CM Alphabetical Index References for 'T78.4 - Other and unspecified allergy'
The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code T78.4. Click on any term below to browse the alphabetical index.
Parent Code: T78 - Adverse effects, not elsewhere classified