T78.089A Anaphylactic reaction due to eggs, unspecified, initial encounter

Billable ICD-10-CM code, FY2026.

Built from T78.089 with 7th character A (initial encounter).

Applies from T78 Adverse effects, not elsewhere classified

Excludes2 (not included here)

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

7th character note

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

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Applies from T78.0 Anaphylactic reaction due to food

Applicable to

• Anaphylactic reaction due to adverse food reaction
• Anaphylactic shock or reaction due to nonpoisonous foods
• Anaphylactoid reaction due to food

Code annotations containing back-references to T78.089A

Back-references to T78.0

• Type 2 Excludes: L27 Dermatitis due to substances taken internally ("adverse food reaction, except dermatitis (T78.0-T78.1)")
• Type 1 Excludes: R57 Shock, not elsewhere classified ("anaphylactic reaction or shock due to adverse food reaction (T78.0-)")
• Type 1 Excludes: T61 Toxic effect of noxious substances eaten as seafood ("anaphylactic reaction or shock due to adverse food reaction (T78.0-)")
• Type 1 Excludes: T62 Toxic effect of other noxious substances eaten as food ("anaphylactic shock (reaction) due to adverse food reaction (T78.0-)")
• Type 1 Excludes: T78.1 Other adverse food reactions, not elsewhere classified ("anaphylactic reaction or shock due to adverse food reaction (T78.0-)")
• Type 1 Excludes: T78.1 Other adverse food reactions, not elsewhere classified ("anaphylactic reaction due to food (T78.0-)")
• Type 1 Excludes: T78.2 Anaphylactic shock, unspecified ("anaphylactic reaction or shock due to adverse food reaction (T78.0-)")
• Type 1 Excludes: T79.4 Traumatic shock ("anaphylactic shock due to adverse food reaction (T78.0-)")
• Type 1 Excludes: T88.6 Anaphylactic reaction due to adverse effect of correct drug or medicament properly administered ("anaphylactic shock or reaction due to adverse food reaction (T78.0-)")

Back-references to T78

• Type 1 Excludes: T75 Other and unspecified effects of other external causes ("adverse effects NEC (T78.-)")

Diagnosis Index entries for T78.089A

• Allergy, allergic (reaction) (to) › eggs › anaphylactic reaction
• Shock › anaphylactic › due to food (nonpoisonous) › eggs

Nearby codes

• T78.081 Anaphylactic reaction due to egg with reactivity to baked egg
• T78.081A Anaphylactic reaction due to egg with reactivity to baked egg, initial encounter
• T78.081D Anaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter
• T78.081S Anaphylactic reaction due to egg with reactivity to baked egg, sequela
• T78.089 Anaphylactic reaction due to eggs, unspecified
• T78.089A Anaphylactic reaction due to eggs, unspecified, initial encounter (this code)
• T78.089D Anaphylactic reaction due to eggs, unspecified, subsequent encounter
• T78.089S Anaphylactic reaction due to eggs, unspecified, sequela
• T78.09 Anaphylactic reaction due to other food products
• T78.09XA Anaphylactic reaction due to other food products, initial encounter
• T78.09XD Anaphylactic reaction due to other food products, subsequent encounter