Other and unspecified allergy

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 3 more specific codes instead:

T78.40 Allergy, unspecified (also a header)
T78.41 Arthus phenomenon (also a header)
T78.49 Other allergy (also a header)

This code requires a seventh character. See the rule below.

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

FY2012 Added to the draft code set draft Other and unspecified allergy

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from T78 Adverse effects, not elsewhere classified

Seventh character required

The appropriate 7th character is to be added to each code from category T78

Excludes2 - not included here

complications of surgical and medical care NEC (T80-T88)

Inherited from the T66-T78 section Other and unspecified effects of external causes (T66-T78)

Code also

, 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-)

Codes in the same group

Code	Description	Status
T78.0	Anaphylactic reaction due to food	Not billable
T78.1	Other adverse food reactions, not elsewhere classified	Not billable
T78.2	Anaphylactic shock, unspecified	Not billable
T78.3	Angioneurotic edema	Not billable
T78.8	Other adverse effects, not elsewhere classified	Not billable