T78 Adverse effects, not elsewhere classified
ICD-10-CM category T78 sits in Chapter 20 (External causes of morbidity, V00-Y99). It contains 81 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.
Subcategories
T78.0 Anaphylactic reaction due to foodT78.00 Anaphylactic reaction due to unspecified foodT78.01 Anaphylactic reaction due to peanutsT78.02 Anaphylactic reaction due to shellfish (crustaceans)T78.03 Anaphylactic reaction due to other fishT78.04 Anaphylactic reaction due to fruits and vegetablesT78.05 Anaphylactic reaction due to tree nuts and seedsT78.06 Anaphylactic reaction due to food additivesT78.07 Anaphylactic reaction due to milk and dairy productsT78.070 Anaphyl rct d/t milk and dair prod w tolerance to bkd milkT78.071 Anaphyl react d/t milk and dairy prod with rct to baked milkT78.079 Anaphyl reaction due to milk and dairy products, unspecifiedT78.08 Anaphylactic reaction due to eggsT78.080 Anaphylactic reaction due to egg with tolerance to baked eggT78.081 Anaphyl reaction due to egg with reactivity to baked eggT78.089 Anaphylactic reaction due to eggs, unspecifiedT78.09 Anaphylactic reaction due to other food productsT78.1 Other adverse food reactions, not elsewhere classifiedT78.11 Other adverse food reactions due to milk and dairy productsT78.110 Oth ad rcts d/t milk and dair prod w tolerance to bkd milkT78.111 Oth ad food rct d/t milk and dair prod with rct to bkd milkT78.119 Oth ad rct d/t milk and dair prod w bkd milk tol/rct, unspT78.12 Other adverse food reaction due to eggsT78.120 Other advrs food react d/t egg with tolerance to baked eggT78.121 Other adverse food reaction due to egg with rct to baked eggT78.129 Other advrs food react d/t egg with baked egg tol/rct, unspT78.19 Other adverse food reactions, not elsewhere classifiedT78.2 Anaphylactic shock, unspecifiedT78.3 Angioneurotic edemaT78.4 Other and unspecified allergyT78.40 Allergy, unspecifiedT78.41 Arthus phenomenonT78.49 Other allergyT78.8 Other adverse effects, not elsewhere classified
Billable codes in T78
| Code | Description |
|---|---|
T78.00XA | Anaphylactic reaction due to unspecified food, initial encounter |
T78.00XD | Anaphylactic reaction due to unspecified food, subsequent encounter |
T78.00XS | Anaphylactic reaction due to unspecified food, sequela |
T78.01XA | Anaphylactic reaction due to peanuts, initial encounter |
T78.01XD | Anaphylactic reaction due to peanuts, subsequent encounter |
T78.01XS | Anaphylactic reaction due to peanuts, sequela |
T78.02XA | Anaphylactic reaction due to shellfish (crustaceans), initial encounter |
T78.02XD | Anaphylactic reaction due to shellfish (crustaceans), subsequent encounter |
T78.02XS | Anaphylactic reaction due to shellfish (crustaceans), sequela |
T78.03XA | Anaphylactic reaction due to other fish, initial encounter |
T78.03XD | Anaphylactic reaction due to other fish, subsequent encounter |
T78.03XS | Anaphylactic reaction due to other fish, sequela |
T78.04XA | Anaphylactic reaction due to fruits and vegetables, initial encounter |
T78.04XD | Anaphylactic reaction due to fruits and vegetables, subsequent encounter |
T78.04XS | Anaphylactic reaction due to fruits and vegetables, sequela |
T78.05XA | Anaphylactic reaction due to tree nuts and seeds, initial encounter |
T78.05XD | Anaphylactic reaction due to tree nuts and seeds, subsequent encounter |
T78.05XS | Anaphylactic reaction due to tree nuts and seeds, sequela |
T78.06XA | Anaphylactic reaction due to food additives, initial encounter |
T78.06XD | Anaphylactic reaction due to food additives, subsequent encounter |
T78.06XS | Anaphylactic reaction due to food additives, sequela |
T78.070A | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, initial encounter |
T78.070D | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, subsequent encounter |
T78.070S | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, sequela |
T78.071A | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, initial encounter |
T78.071D | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, subsequent encounter |
T78.071S | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, sequela |
T78.079A | Anaphylactic reaction due to milk and dairy products, unspecified, initial encounter |
T78.079D | Anaphylactic reaction due to milk and dairy products, unspecified, subsequent encounter |
T78.079S | Anaphylactic reaction due to milk and dairy products, unspecified, sequela |
T78.080A | Anaphylactic reaction due to egg with tolerance to baked egg, initial encounter |
T78.080D | Anaphylactic reaction due to egg with tolerance to baked egg, subsequent encounter |
T78.080S | Anaphylactic reaction due to egg with tolerance to baked egg, sequela |
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 |
T78.089A | Anaphylactic reaction due to eggs, unspecified, initial encounter |
T78.089D | Anaphylactic reaction due to eggs, unspecified, subsequent encounter |
T78.089S | Anaphylactic reaction due to eggs, unspecified, sequela |
T78.09XA | Anaphylactic reaction due to other food products, initial encounter |
T78.09XD | Anaphylactic reaction due to other food products, subsequent encounter |
T78.09XS | Anaphylactic reaction due to other food products, sequela |
T78.110A | Other adverse food reactions due to milk and dairy products with tolerance to baked milk, initial encounter |
T78.110D | Other adverse food reactions due to milk and dairy products with tolerance to baked milk, subsequent encounter |
T78.110S | Other adverse food reactions due to milk and dairy products with tolerance to baked milk, sequela |
T78.111A | Other adverse food reaction due to milk and dairy products with reactivity to baked milk, initial encounter |
T78.111D | Other adverse food reaction due to milk and dairy products with reactivity to baked milk, subsequent encounter |
T78.111S | Other adverse food reaction due to milk and dairy products with reactivity to baked milk, sequela |
T78.119A | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, initial encounter |
T78.119D | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, subsequent encounter |
T78.119S | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, sequela |
T78.120A | Other adverse food reaction due to egg with tolerance to baked egg, initial encounter |
T78.120D | Other adverse food reaction due to egg with tolerance to baked egg, subsequent encounter |
T78.120S | Other adverse food reaction due to egg with tolerance to baked egg, sequela |
T78.121A | Other adverse food reaction due to egg with reactivity to baked egg, initial encounter |
T78.121D | Other adverse food reaction due to egg with reactivity to baked egg, subsequent encounter |
T78.121S | Other adverse food reaction due to egg with reactivity to baked egg, sequela |
T78.129A | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, initial encounter |
T78.129D | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, subsequent encounter |
T78.129S | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, sequela |
T78.19XA | Other adverse food reactions, not elsewhere classified, initial encounter |
T78.19XD | Other adverse food reactions, not elsewhere classified, subsequent encounter |
T78.19XS | Other adverse food reactions, not elsewhere classified, sequela |
T78.2XXA | Anaphylactic shock, unspecified, initial encounter |
T78.2XXD | Anaphylactic shock, unspecified, subsequent encounter |
T78.2XXS | Anaphylactic shock, unspecified, sequela |
T78.3XXA | Angioneurotic edema, initial encounter |
T78.3XXD | Angioneurotic edema, subsequent encounter |
T78.3XXS | Angioneurotic edema, sequela |
T78.40XA | Allergy, unspecified, initial encounter |
T78.40XD | Allergy, unspecified, subsequent encounter |
T78.40XS | Allergy, unspecified, sequela |
T78.41XA | Arthus phenomenon, initial encounter |
T78.41XD | Arthus phenomenon, subsequent encounter |
T78.41XS | Arthus phenomenon, sequela |
T78.49XA | Other allergy, initial encounter |
T78.49XD | Other allergy, subsequent encounter |
T78.49XS | Other allergy, sequela |
T78.8XXA | Other adverse effects, not elsewhere classified, initial encounter |
T78.8XXD | Other adverse effects, not elsewhere classified, subsequent encounter |
T78.8XXS | Other adverse effects, not elsewhere classified, sequela |
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