ICD-10-CM Code T78.40
Allergy, unspecified
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.7th Character Required
Code requires 7th Character Extension identifier. This 7th Character usually captures Episode of Care information, such as "Initial Encounter," "Subsquent Encounter," or "Sequela."ICD Code T78.40 is a non-billable code. To code a diagnosis of this type, you must use specify a 7th character that describes the diagnosis 'allergy, unspecified' in more detail. The 7th characters that can be added, and the resulting billable codes, are as follows:
| 7th Digit | Billable Code | 7th Digit Specifies |
|---|---|---|
| A | T78.40XA | initial encounter |
| D | T78.40XD | subsequent encounter |
| S | T78.40XS | sequela |
What is 7th Character Extension?
For codes less than 6 characters that require a 7th character a placeholder 'X' should be assigned for all characters less than 6. The 7th character must always be the 7th position of a code. E.g. The ICD-10-CM code T67.4 (Heat exhaustion due to salt depletion) requires an Episode of Care identifier. T67.4XXA Initial Encounter or T67.4XXD Subsequent Encounter. More InfoThe 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 T78.40 Info for medical coders on how to properly use this ICD-10 code
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Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive. - Allergic reaction NOS
- Hypersensitivity NOS
Related Concepts SNOMET-CT
- Allergic vaginitis (disorder)
- Allergic reaction to colophony (disorder)
- Perindopril pseudoallergy (disorder)
- Quinapril pseudoallergy (disorder)
Coding Advice SNOMET-CT
- Episode of care information needed
- Possible requirement for an external cause code
ICD-10-CM Alphabetical Index References for 'T78.40 - Allergy, unspecified'
The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code T78.40. Click on any term below to browse the alphabetical index.
Parent Code: T78.4 - Other and unspecified allergy