T78.1 — Other adverse food reactions, not elsewhere classified
Is T78.1 billable?
No — T78.1 is a non-billable header code. T78.1 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 21 billable codes beneath T78.1.
Billable codes under this header
- T78.19XAOther adverse food reactions, not elsewhere classified, initial encounter
- T78.19XDOther adverse food reactions, not elsewhere classified, subsequent encounter
- T78.19XSOther adverse food reactions, not elsewhere classified, sequela
- T78.110AOther adverse food reactions due to milk and dairy products with tolerance to baked milk, initial encounter
- T78.110DOther adverse food reactions due to milk and dairy products with tolerance to baked milk, subsequent encounter
- T78.110SOther adverse food reactions due to milk and dairy products with tolerance to baked milk, sequela
- T78.111AOther adverse food reaction due to milk and dairy products with reactivity to baked milk, initial encounter
- T78.111DOther adverse food reaction due to milk and dairy products with reactivity to baked milk, subsequent encounter
- T78.111SOther adverse food reaction due to milk and dairy products with reactivity to baked milk, sequela
- T78.119AOther adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, initial encounter
- T78.119DOther adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, subsequent encounter
- T78.119SOther adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, sequela
- T78.120AOther adverse food reaction due to egg with tolerance to baked egg, initial encounter
- T78.120DOther adverse food reaction due to egg with tolerance to baked egg, subsequent encounter
- T78.120SOther adverse food reaction due to egg with tolerance to baked egg, sequela
- T78.121AOther adverse food reaction due to egg with reactivity to baked egg, initial encounter
- T78.121DOther adverse food reaction due to egg with reactivity to baked egg, subsequent encounter
- T78.121SOther adverse food reaction due to egg with reactivity to baked egg, sequela
- T78.129AOther adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, initial encounter
- T78.129DOther adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, subsequent encounter
- T78.129SOther adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, sequela
T78.1 at a glance
| Code | T78.1 |
|---|---|
| Description | Other adverse food reactions, not elsewhere classified |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with T78.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code
Report an additional code alongside T78.1 to fully describe the condition. T78.1 is sequenced first.
- code to identify the type of reaction, if applicable
Excludes2 — not included here
The conditions below are not part of T78.1, but a patient may have both at the same time. When documentation supports it, T78.1 and the excluded code may both be reported.
Use additional code — inherited from Chapter 19
Report an additional code alongside T78.1 to fully describe the condition. T78.1 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T78.1, but a patient may have both at the same time. When documentation supports it, T78.1 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T78
The conditions below are not part of T78.1, but a patient may have both at the same time. When documentation supports it, T78.1 and the excluded code may both be reported.
- complications of surgical and medical care NEC (T80-T88)
Code also — inherited from T66-T78
Two codes may be needed to describe the condition fully. Whether T78.1 is sequenced first depends on the reason for the encounter.
- , 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-)
What codes fall under T78.1? (3)
How long has T78.1 existed?
T78.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.