T78 Adverse effects, not elsewhere classified

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Adverse effects, not elsewhere classified is T78 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
T66-T78: Other and unspecified effects of external causes (T66-T78)
Category T78
35 codes (27 billable)
FY2026 Status
Stable since FY2024
Excludes2
Not included here. These conditions are coded elsewhere but may be coded together if applicable.
  • complications of surgical and medical care NEC (T80-T88)

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.2
Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.3

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

More Specific Codes

T78.0 Anaphylactic reaction due to food T78.00 Anaphylactic reaction due to unspecified food T78.01 Anaphylactic reaction due to peanuts T78.02 Anaphylactic reaction due to shellfish (crustaceans) T78.03 Anaphylactic reaction due to other fish T78.04 Anaphylactic reaction due to fruits and vegetables T78.05 Anaphylactic reaction due to tree nuts and seeds T78.06 Anaphylactic reaction due to food additives T78.07 Anaphylactic reaction due to milk and dairy products T78.070 Anaphylactic reaction due to milk and dairy products with tolerance to baked milk T78.071 Anaphylactic reaction due to milk and dairy products with reactivity to baked milk T78.079 Anaphylactic reaction due to milk and dairy products, unspecified T78.08 Anaphylactic reaction due to eggs T78.080 Anaphylactic reaction due to egg with tolerance to baked egg T78.081 Anaphylactic reaction due to egg with reactivity to baked egg T78.089 Anaphylactic reaction due to eggs, unspecified T78.09 Anaphylactic reaction due to other food products T78.1 Other adverse food reactions, not elsewhere classified T78.11 Other adverse food reactions due to milk and dairy products T78.110 Other adverse food reactions due to milk and dairy products with tolerance to baked milk T78.111 Other adverse food reaction due to milk and dairy products with reactivity to baked milk T78.119 Other adverse food reaction due to milk and dairy products with baked milk tolerance/reactivity, unspecified T78.12 Other adverse food reaction due to eggs T78.120 Other adverse food reaction due to egg with tolerance to baked egg T78.121 Other adverse food reaction due to egg with reactivity to baked egg T78.129 Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified T78.19 Other adverse food reactions, not elsewhere classified T78.2 Anaphylactic shock, unspecified T78.3 Angioneurotic edema T78.4 Other and unspecified allergy

Related Codes in T78

T78.0 Anaphylactic reaction due to food T78.00 Anaphylactic reaction due to unspecified food T78.01 Anaphylactic reaction due to peanuts T78.02 Anaphylactic reaction due to shellfish (crustaceans) T78.03 Anaphylactic reaction due to other fish T78.04 Anaphylactic reaction due to fruits and vegetables T78.05 Anaphylactic reaction due to tree nuts and seeds T78.06 Anaphylactic reaction due to food additives T78.07 Anaphylactic reaction due to milk and dairy products T78.070 Anaphylactic reaction due to milk and dairy products with tolerance to baked milk T78.071 Anaphylactic reaction due to milk and dairy products with reactivity to baked milk T78.079 Anaphylactic reaction due to milk and dairy products, unspecified T78.08 Anaphylactic reaction due to eggs T78.080 Anaphylactic reaction due to egg with tolerance to baked egg T78.081 Anaphylactic reaction due to egg with reactivity to baked egg T78.089 Anaphylactic reaction due to eggs, unspecified T78.09 Anaphylactic reaction due to other food products T78.1 Other adverse food reactions, not elsewhere classified T78.11 Other adverse food reactions due to milk and dairy products T78.110 Other adverse food reactions due to milk and dairy products with tolerance to baked milk
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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