T78.121: Other adverse food reaction due to egg with reactivity to baked egg
T78.121 is a non-billable header ICD-10-CM code for other adverse food reaction due to egg with reactivity to baked egg. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category T78
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- Other adverse food reaction due to egg with tolerance to baked egg (T78.120)
Excludes1 inherited from the categories above T78.121
A category’s note binds every code beneath it.
Excludes2 inherited from the categories above T78.121
Not part of this code, but both may be coded when both are present.
Written on T78.1: Other adverse food reactions, not elsewhere classified
Other codes that can never be billed with T78.121
Their own Excludes1 notes name this code, so the conflict is not listed above.
- T78.120Other adverse food reaction due to egg with tolerance to baked egg
- 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
- T75Other and unspecified effects of other external causes
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Alphabetic index entries that lead here
- Allergy, allergic›eggs›adverse reaction NEC›with›reactivity to baked egg
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead T78.121
3 child codes. Green means billable.