ICD-10-CM category
T78: Adverse effects, not elsewhere classified
Codes under T78 (Adverse effects, not elsewhere classified). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| T78.0 | Anaphylactic reaction due to food | — |
| T78.0 | Anaphylactic reaction due to food | — |
| T78.00 | Anaphylactic reaction due to unspecified food | — |
| T78.00 | Anaphylactic reaction due to unspecified food | — |
| T78.00XA | Anaphylactic reaction due to unspecified food, initial encounter | ✓ |
| T78.00XA | Anaphylactic reaction due to unspecified food, initial encounter | ✓ |
| T78.00XD | Anaphylactic reaction due to unspecified food, subsequent encounter | ✓ |
| T78.00XD | Anaphylactic reaction due to unspecified food, subsequent encounter | ✓ |
| T78.00XS | Anaphylactic reaction due to unspecified food, sequela | ✓ |
| T78.00XS | Anaphylactic reaction due to unspecified food, sequela | ✓ |
| T78.01 | Anaphylactic reaction due to peanuts | — |
| T78.01 | Anaphylactic reaction due to peanuts | — |
| T78.1 | Other adverse food reactions, not elsewhere classified | — |
| T78.1 | Other adverse food reactions, not elsewhere classified | — |
| T78.01XA | Anaphylactic reaction due to peanuts, initial encounter | ✓ |
| T78.01XA | Anaphylactic reaction due to peanuts, initial encounter | ✓ |
| T78.01XD | Anaphylactic reaction due to peanuts, subsequent encounter | ✓ |
| T78.01XD | Anaphylactic reaction due to peanuts, subsequent encounter | ✓ |
| T78.01XS | Anaphylactic reaction due to peanuts, sequela | ✓ |
| T78.01XS | Anaphylactic reaction due to peanuts, sequela | ✓ |
| T78.02 | Anaphylactic reaction due to shellfish (crustaceans) | — |
| T78.02 | Anaphylactic reaction due to shellfish (crustaceans) | — |
| T78.2 | Anaphylactic shock, unspecified | — |
| T78.2 | Anaphylactic shock, unspecified | — |
| T78.02XA | Anaphylactic reaction due to shellfish (crustaceans), initial encounter | ✓ |
| T78.02XA | Anaphylactic reaction due to shellfish (crustaceans), initial encounter | ✓ |
| T78.02XD | Anaphylactic reaction due to shellfish (crustaceans), subsequent encounter | ✓ |
| T78.02XD | Anaphylactic reaction due to shellfish (crustaceans), subsequent encounter | ✓ |
| T78.02XS | Anaphylactic reaction due to shellfish (crustaceans), sequela | ✓ |
| T78.02XS | Anaphylactic reaction due to shellfish (crustaceans), sequela | ✓ |
| T78.2XXA | Anaphylactic shock, unspecified, initial encounter | ✓ |
| T78.2XXA | Anaphylactic shock, unspecified, initial encounter | ✓ |
| T78.2XXD | Anaphylactic shock, unspecified, subsequent encounter | ✓ |
| T78.2XXD | Anaphylactic shock, unspecified, subsequent encounter | ✓ |
| T78.2XXS | Anaphylactic shock, unspecified, sequela | ✓ |
| T78.2XXS | Anaphylactic shock, unspecified, sequela | ✓ |
| T78.03 | Anaphylactic reaction due to other fish | — |
| T78.03 | Anaphylactic reaction due to other fish | — |
| T78.3 | Angioneurotic edema | — |
| T78.3 | Angioneurotic edema | — |
| T78.03XA | Anaphylactic reaction due to other fish, initial encounter | ✓ |
| T78.03XA | Anaphylactic reaction due to other fish, initial encounter | ✓ |
| T78.03XD | Anaphylactic reaction due to other fish, subsequent encounter | ✓ |
| T78.03XD | Anaphylactic reaction due to other fish, subsequent encounter | ✓ |
| T78.03XS | Anaphylactic reaction due to other fish, sequela | ✓ |
| T78.03XS | Anaphylactic reaction due to other fish, sequela | ✓ |
| T78.3XXA | Angioneurotic edema, initial encounter | ✓ |
| T78.3XXA | Angioneurotic edema, initial encounter | ✓ |
| T78.3XXD | Angioneurotic edema, subsequent encounter | ✓ |
| T78.3XXD | Angioneurotic edema, subsequent encounter | ✓ |
| T78.3XXS | Angioneurotic edema, sequela | ✓ |
| T78.3XXS | Angioneurotic edema, sequela | ✓ |
| T78.04 | Anaphylactic reaction due to fruits and vegetables | — |
| T78.04 | Anaphylactic reaction due to fruits and vegetables | — |
| T78.4 | Other and unspecified allergy | — |
| T78.4 | Other and unspecified allergy | — |
| T78.04XA | Anaphylactic reaction due to fruits and vegetables, initial encounter | ✓ |
| T78.04XA | Anaphylactic reaction due to fruits and vegetables, initial encounter | ✓ |
| T78.04XD | Anaphylactic reaction due to fruits and vegetables, subsequent encounter | ✓ |
| T78.04XD | Anaphylactic reaction due to fruits and vegetables, subsequent encounter | ✓ |
| T78.04XS | Anaphylactic reaction due to fruits and vegetables, sequela | ✓ |
| T78.04XS | Anaphylactic reaction due to fruits and vegetables, sequela | ✓ |
| T78.05 | Anaphylactic reaction due to tree nuts and seeds | — |
| T78.05 | Anaphylactic reaction due to tree nuts and seeds | — |
| T78.05XA | Anaphylactic reaction due to tree nuts and seeds, initial encounter | ✓ |
| T78.05XA | Anaphylactic reaction due to tree nuts and seeds, initial encounter | ✓ |
| T78.05XD | Anaphylactic reaction due to tree nuts and seeds, subsequent encounter | ✓ |
| T78.05XD | Anaphylactic reaction due to tree nuts and seeds, subsequent encounter | ✓ |
| T78.05XS | Anaphylactic reaction due to tree nuts and seeds, sequela | ✓ |
| T78.05XS | Anaphylactic reaction due to tree nuts and seeds, sequela | ✓ |
| T78.06 | Anaphylactic reaction due to food additives | — |
| T78.06 | Anaphylactic reaction due to food additives | — |
| T78.06XA | Anaphylactic reaction due to food additives, initial encounter | ✓ |
| T78.06XA | Anaphylactic reaction due to food additives, initial encounter | ✓ |
| T78.06XD | Anaphylactic reaction due to food additives, subsequent encounter | ✓ |
| T78.06XD | Anaphylactic reaction due to food additives, subsequent encounter | ✓ |
| T78.06XS | Anaphylactic reaction due to food additives, sequela | ✓ |
| T78.06XS | Anaphylactic reaction due to food additives, sequela | ✓ |
| T78.07 | Anaphylactic reaction due to milk and dairy products | — |
| T78.07 | Anaphylactic reaction due to milk and dairy products | — |
| T78.08 | Anaphylactic reaction due to eggs | — |
| T78.08 | Anaphylactic reaction due to eggs | — |
| T78.8 | Other adverse effects, not elsewhere classified | — |
| T78.8 | Other adverse effects, not elsewhere classified | — |
| T78.8XXA | Other adverse effects, not elsewhere classified, initial encounter | ✓ |
| T78.8XXA | Other adverse effects, not elsewhere classified, initial encounter | ✓ |
| T78.8XXD | Other adverse effects, not elsewhere classified, subsequent encounter | ✓ |
| T78.8XXD | Other adverse effects, not elsewhere classified, subsequent encounter | ✓ |
| T78.8XXS | Other adverse effects, not elsewhere classified, sequela | ✓ |
| T78.8XXS | Other adverse effects, not elsewhere classified, sequela | ✓ |
| T78.09 | Anaphylactic reaction due to other food products | — |
| T78.09 | Anaphylactic reaction due to other food products | — |
| T78.09XA | Anaphylactic reaction due to other food products, initial encounter | ✓ |
| T78.09XA | Anaphylactic reaction due to other food products, initial encounter | ✓ |
| T78.09XD | Anaphylactic reaction due to other food products, subsequent encounter | ✓ |
| T78.09XD | Anaphylactic reaction due to other food products, subsequent encounter | ✓ |
| T78.09XS | Anaphylactic reaction due to other food products, sequela | ✓ |
| T78.09XS | Anaphylactic reaction due to other food products, sequela | ✓ |
| T78.11 | Other adverse food reactions due to milk and dairy products | — |
| T78.11 | Other adverse food reactions due to milk and dairy products | — |
| T78.12 | Other adverse food reaction due to eggs | — |
| T78.12 | Other adverse food reaction due to eggs | — |
| T78.19 | Other adverse food reactions, not elsewhere classified | — |
| T78.19 | Other adverse food reactions, not elsewhere classified | — |
| T78.19XA | Other adverse food reactions, not elsewhere classified, initial encounter | ✓ |
| T78.19XA | Other adverse food reactions, not elsewhere classified, initial encounter | ✓ |
| T78.19XD | Other adverse food reactions, not elsewhere classified, subsequent encounter | ✓ |
| T78.19XD | Other adverse food reactions, not elsewhere classified, subsequent encounter | ✓ |
| T78.19XS | Other adverse food reactions, not elsewhere classified, sequela | ✓ |
| T78.19XS | Other adverse food reactions, not elsewhere classified, sequela | ✓ |
| T78.40 | Allergy, unspecified | — |
| T78.40 | Allergy, unspecified | — |
| T78.40XA | Allergy, unspecified, initial encounter | ✓ |
| T78.40XA | Allergy, unspecified, initial encounter | ✓ |
| T78.40XD | Allergy, unspecified, subsequent encounter | ✓ |
| T78.40XD | Allergy, unspecified, subsequent encounter | ✓ |
| T78.40XS | Allergy, unspecified, sequela | ✓ |
| T78.40XS | Allergy, unspecified, sequela | ✓ |
| T78.41 | Arthus phenomenon | — |
| T78.41 | Arthus phenomenon | — |
| T78.41XA | Arthus phenomenon, initial encounter | ✓ |
| T78.41XA | Arthus phenomenon, initial encounter | ✓ |
| T78.41XD | Arthus phenomenon, subsequent encounter | ✓ |
| T78.41XD | Arthus phenomenon, subsequent encounter | ✓ |
| T78.41XS | Arthus phenomenon, sequela | ✓ |
| T78.41XS | Arthus phenomenon, sequela | ✓ |
| T78.49 | Other allergy | — |
| T78.49 | Other allergy | — |
| T78.49XA | Other allergy, initial encounter | ✓ |
| T78.49XA | Other allergy, initial encounter | ✓ |
| T78.49XD | Other allergy, subsequent encounter | ✓ |
| T78.49XD | Other allergy, subsequent encounter | ✓ |
| T78.49XS | Other allergy, sequela | ✓ |
| T78.49XS | Other allergy, sequela | ✓ |
| T78.070 | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk | — |
| T78.070 | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk | — |
| T78.070A | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, initial encounter | ✓ |
| 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 | ✓ |
| T78.070D | 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 | ✓ |
| T78.070S | Anaphylactic reaction due to milk and dairy products with tolerance to baked milk, sequela | ✓ |
| T78.071 | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk | — |
| T78.071 | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk | — |
| T78.071A | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, initial encounter | ✓ |
| 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 | ✓ |
| T78.071D | 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 | ✓ |
| T78.071S | Anaphylactic reaction due to milk and dairy products with reactivity to baked milk, sequela | ✓ |
| T78.079 | Anaphylactic reaction due to milk and dairy products, unspecified | — |
| T78.079 | Anaphylactic reaction due to milk and dairy products, unspecified | — |
| T78.079A | Anaphylactic reaction due to milk and dairy products, unspecified, initial encounter | ✓ |
| 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 | ✓ |
| T78.079D | Anaphylactic reaction due to milk and dairy products, unspecified, subsequent encounter | ✓ |
| T78.079S | Anaphylactic reaction due to milk and dairy products, unspecified, sequela | ✓ |
| T78.079S | Anaphylactic reaction due to milk and dairy products, unspecified, sequela | ✓ |
| T78.080 | Anaphylactic reaction due to egg with tolerance to baked egg | — |
| T78.080 | Anaphylactic reaction due to egg with tolerance to baked egg | — |
| T78.080A | Anaphylactic reaction due to egg with tolerance to baked egg, initial encounter | ✓ |
| 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 | ✓ |
| T78.080D | 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 | ✓ |
| T78.080S | Anaphylactic reaction due to egg with tolerance to baked egg, sequela | ✓ |
| T78.081 | Anaphylactic reaction due to egg with reactivity to baked egg | — |
| 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 | ✓ |
| T78.081A | 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 | ✓ |
| T78.081D | 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 | ✓ |
| T78.081S | Anaphylactic reaction due to egg with reactivity to baked egg, sequela | ✓ |
| T78.089 | Anaphylactic reaction due to eggs, unspecified | — |
| T78.089 | Anaphylactic reaction due to eggs, unspecified | — |
| T78.089A | Anaphylactic reaction due to eggs, unspecified, initial encounter | ✓ |
| T78.089A | Anaphylactic reaction due to eggs, unspecified, initial encounter | ✓ |
| T78.089D | Anaphylactic reaction due to eggs, unspecified, subsequent encounter | ✓ |
| T78.089D | Anaphylactic reaction due to eggs, unspecified, subsequent encounter | ✓ |
| T78.089S | Anaphylactic reaction due to eggs, unspecified, sequela | ✓ |
| T78.089S | Anaphylactic reaction due to eggs, unspecified, sequela | ✓ |
| T78.110 | Other adverse food reactions due to milk and dairy products with tolerance to baked milk | — |
| T78.110 | Other adverse food reactions due to milk and dairy products with tolerance to baked milk | — |
| T78.110A | Other adverse food reactions due to milk and dairy products with tolerance to baked milk, initial encounter | ✓ |
| 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 | ✓ |
| T78.110D | 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 | ✓ |
| T78.110S | Other adverse food reactions due to milk and dairy products with tolerance to baked milk, sequela | ✓ |
| T78.111 | Other adverse food reaction due to milk and dairy products with reactivity to baked milk | — |
| T78.111 | Other adverse food reaction due to milk and dairy products with reactivity to baked milk | — |
| T78.111A | Other adverse food reaction due to milk and dairy products with reactivity to baked milk, initial encounter | ✓ |
| 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 | ✓ |
| T78.111D | 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 | ✓ |
| T78.111S | Other adverse food reaction due to milk and dairy products with reactivity to baked milk, sequela | ✓ |
| T78.119 | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified | — |
| T78.119 | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified | — |
| T78.119A | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, initial encounter | ✓ |
| 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 | ✓ |
| T78.119D | 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 | ✓ |
| T78.119S | Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified, sequela | ✓ |
| T78.120 | Other adverse food reaction due to egg with tolerance to baked egg | — |
| T78.120 | Other adverse food reaction due to egg with tolerance to baked egg | — |
| T78.120A | Other adverse food reaction due to egg with tolerance to baked egg, initial encounter | ✓ |
| 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 | ✓ |
| T78.120D | 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 | ✓ |
| T78.120S | Other adverse food reaction due to egg with tolerance to baked egg, sequela | ✓ |
| T78.121 | Other adverse food reaction due to egg with reactivity to baked egg | — |
| T78.121 | Other adverse food reaction due to egg with reactivity to baked egg | — |
| T78.121A | Other adverse food reaction due to egg with reactivity to baked egg, initial encounter | ✓ |
| 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 | ✓ |
| T78.121D | 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 | ✓ |
| T78.121S | Other adverse food reaction due to egg with reactivity to baked egg, sequela | ✓ |
| T78.129 | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified | — |
| T78.129 | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified | — |
| T78.129A | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, initial encounter | ✓ |
| 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 | ✓ |
| T78.129D | 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 | ✓ |
| T78.129S | Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, sequela | ✓ |
Frequently asked questions
What is ICD-10-CM code T78?
T78 is an ICD-10-CM category covering Adverse effects, not elsewhere classified. It contains 230 more specific diagnosis codes, 162 of which are billable.
Is T78 a billable code?
No — T78 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example T78.0 — Anaphylactic reaction due to food). 162 of the 230 codes under T78 are billable.
What codes fall under T78?
T78 includes T78.0, T78.0, T78.00, T78.00, T78.00XA, plus 225 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free