T78.40⚠ Requires 7th Character

Allergy, unspecified

⚠ 7th Character Required

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

This code is not valid for billing without a 7th character. Append one of the following to T78.40:

Ainitial encounterT78.40XADsubsequent encounterT78.40XDSsequelaT78.40XS

Inclusion Terms

  • •Allergic reaction NOS
  • •Hypersensitivity NOS

Also Indexed As(ICD-10-CM Alphabetic Index)

These clinical terms, synonyms, and manifestations all map to T78.40 in the official ICD-10-CM Alphabetic Index.

Allergy, allergic (reaction) (to)Allergy, allergic (reaction) (to), drug, medicament & biological (any) (external) (internal)Hypersensitive, hypersensitiveness, hypersensitivity, reaction

Code Hierarchy

┌19Injury, poisoning and certain other consequences of external causes (S00-T88)├T66-T78Other and unspecified effects of external causes (T66-T78)├T78Adverse effects, not elsewhere classified
└T78.40Allergy, unspecified

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