T78 — Adverse effects, not elsewhere classified
Not billable
Is T78 billable?
No — T78 is a non-billable header code. T78 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 60 billable codes beneath T78.
Billable codes under this header
- T78.2XXAAnaphylactic shock, unspecified, initial encounter
- T78.2XXDAnaphylactic shock, unspecified, subsequent encounter
- T78.2XXSAnaphylactic shock, unspecified, sequela
- T78.3XXAAngioneurotic edema, initial encounter
- T78.3XXDAngioneurotic edema, subsequent encounter
- T78.3XXSAngioneurotic edema, sequela
- T78.8XXAOther adverse effects, not elsewhere classified, initial encounter
- T78.8XXDOther adverse effects, not elsewhere classified, subsequent encounter
- T78.8XXSOther adverse effects, not elsewhere classified, sequela
- T78.00XAAnaphylactic reaction due to unspecified food, initial encounter
- T78.00XDAnaphylactic reaction due to unspecified food, subsequent encounter
- T78.00XSAnaphylactic reaction due to unspecified food, sequela
- T78.01XAAnaphylactic reaction due to peanuts, initial encounter
- T78.01XDAnaphylactic reaction due to peanuts, subsequent encounter
- T78.01XSAnaphylactic reaction due to peanuts, sequela
- T78.02XAAnaphylactic reaction due to shellfish (crustaceans), initial encounter
- T78.02XDAnaphylactic reaction due to shellfish (crustaceans), subsequent encounter
- T78.02XSAnaphylactic reaction due to shellfish (crustaceans), sequela
- T78.03XAAnaphylactic reaction due to other fish, initial encounter
- T78.03XDAnaphylactic reaction due to other fish, subsequent encounter
- T78.03XSAnaphylactic reaction due to other fish, sequela
- T78.04XAAnaphylactic reaction due to fruits and vegetables, initial encounter
- T78.04XDAnaphylactic reaction due to fruits and vegetables, subsequent encounter
- T78.04XSAnaphylactic reaction due to fruits and vegetables, sequela
- T78.05XAAnaphylactic reaction due to tree nuts and seeds, initial encounter
- T78.05XDAnaphylactic reaction due to tree nuts and seeds, subsequent encounter
- T78.05XSAnaphylactic reaction due to tree nuts and seeds, sequela
- T78.06XAAnaphylactic reaction due to food additives, initial encounter
- T78.06XDAnaphylactic reaction due to food additives, subsequent encounter
- T78.06XSAnaphylactic reaction due to food additives, sequela
- T78.09XAAnaphylactic reaction due to other food products, initial encounter
- T78.09XDAnaphylactic reaction due to other food products, subsequent encounter
- T78.09XSAnaphylactic reaction due to other food products, sequela
- 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
- T78.40XAAllergy, unspecified, initial encounter
- T78.40XDAllergy, unspecified, subsequent encounter
- T78.40XSAllergy, unspecified, sequela
- T78.41XAArthus phenomenon, initial encounter
- T78.41XDArthus phenomenon, subsequent encounter
- T78.41XSArthus phenomenon, sequela
- T78.49XAOther allergy, initial encounter
- T78.49XDOther allergy, subsequent encounter
- T78.49XSOther allergy, sequela
- T78.070AAnaphylactic reaction due to milk and dairy products with tolerance to baked milk, initial encounter
- T78.070DAnaphylactic reaction due to milk and dairy products with tolerance to baked milk, subsequent encounter
- T78.070SAnaphylactic reaction due to milk and dairy products with tolerance to baked milk, sequela
- T78.071AAnaphylactic reaction due to milk and dairy products with reactivity to baked milk, initial encounter
- T78.071DAnaphylactic reaction due to milk and dairy products with reactivity to baked milk, subsequent encounter
- T78.071SAnaphylactic reaction due to milk and dairy products with reactivity to baked milk, sequela
- T78.079AAnaphylactic reaction due to milk and dairy products, unspecified, initial encounter
- T78.079DAnaphylactic reaction due to milk and dairy products, unspecified, subsequent encounter
- T78.079SAnaphylactic reaction due to milk and dairy products, unspecified, sequela
- T78.080AAnaphylactic reaction due to egg with tolerance to baked egg, initial encounter
- T78.080DAnaphylactic reaction due to egg with tolerance to baked egg, subsequent encounter
- T78.080SAnaphylactic reaction due to egg with tolerance to baked egg, sequela
- T78.081AAnaphylactic reaction due to egg with reactivity to baked egg, initial encounter
- T78.081DAnaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter
- T78.081SAnaphylactic reaction due to egg with reactivity to baked egg, sequela
T78 at a glance
| Code | T78 |
|---|---|
| Description | Adverse effects, not elsewhere classified |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes2 — not included here
The conditions below are not part of T78, but a patient may have both at the same time. When documentation supports it, T78 and the excluded code may both be reported.
- complications of surgical and medical care NEC (T80-T88)
Use additional code — inherited from Chapter 19
Report an additional code alongside T78 to fully describe the condition. T78 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, but a patient may have both at the same time. When documentation supports it, T78 and the excluded code may both be reported.
Code also — inherited from T66-T78
Two codes may be needed to describe the condition fully. Whether T78 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? (6)
- T78.0Anaphylactic reaction due to foodnot billable
- T78.1Other adverse food reactions, not elsewhere classifiednot billable
- T78.2Anaphylactic shock, unspecifiednot billable
- T78.3Angioneurotic edemanot billable
- T78.4Other and unspecified allergynot billable
- T78.8Other adverse effects, not elsewhere classifiednot billable
How long has T78 existed?
T78 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.
Which codes are confused with T78?
ICD-10-CM declares these codes mutually exclusive with T78 — exactly one of each pair can be correct for a given encounter.