T78.1Other adverse food reactions, not elsewhere classified

T78.1 is the ICD-10-CM diagnosis code for other adverse food reactions, not elsewhere classified. It belongs to category T78 (adverse effects, not elsewhere classified), block T66-T78 (other and unspecified effects of external causes) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

Within T78, choose T78.1 (Other adverse food reactions, not elsewhere classified) only when documentation doesn't support a more specific option: anaphylactic reaction due to food (T78.0), anaphylactic shock, unspecified (T78.2), Angioneurotic edema (T78.3), other and unspecified allergy (T78.4) and other adverse effects, not elsewhere classified (T78.8).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

Don't report T78.1 together with the conditions in its Excludes1 note: anaphylactic reaction or shock due to adverse food reaction (T78.0-), anaphylactic reaction due to food (T78.0-) and bacterial food borne intoxications (A05.-).

The conditions in its Excludes2 note aren't part of T78.1, but may be coded alongside it if the patient has both: allergic and dietetic gastroenteritis and colitis (K52.29), allergic rhinitis due to food (J30.5), dermatitis due to food in contact with skin (L23.6, L24.6, L25.4), dermatitis due to ingested food (L27.2) and 2 more.

Use an additional code to identify the type of reaction, if applicable.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.