T78.8A is the authoritative medical code for Other adverse effects, not elsewhere classified, initial encounter. This classification is used in medical billing and clinical recording to specify the clinical criteria for other adverse effects, not elsewhere classified, initial encounter (ICD-10-CM T78.8A), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Other adverse effects, not elsewhere classified, initial encounter is a billable ICD-10-CM diagnosis code T78.8A. Excludes2 (not included here): complications of surgical and medical care NEC T80-T88. Code also: , if applicable, place of occurrence, such as:; highway rest stop Y92.523; school private public state as the place of occurrence of the external cause Y92.21-; service areas as the place of occurrence of the external cause Y92.52-; single-family non-institutional private house as the place of occurrence of the external cause Y92.01-; transport vehicle as the place of occurrence of the external cause Y92.81-. 7th character: The appropriate 7th character is to be added to each code from category T78.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T78.8A in the official ICD-10-CM tabular list.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- complications of surgical and medical care NEC T80-T88
Code Also
Additional codes that may be required to fully describe the encounter.
- , if applicable, place of occurrence, such as:
- highway rest stop Y92.523
- school private public state as the place of occurrence of the external cause Y92.21-
- service areas as the place of occurrence of the external cause Y92.52-
- single-family non-institutional private house as the place of occurrence of the external cause Y92.01-
- transport vehicle as the place of occurrence of the external cause Y92.81-
Frequently Asked Questions (FAQ) & Clinical Guidance
Does T78.8A require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T78.
Can T78.8A be reported alongside related conditions?
Per Excludes2 instructions, T78.8A and the following may both be reported when both are present: complications of surgical and medical care NEC (T80-T88).
Codes in This Family (40)
Official ICD-10-CM classifications in the same code family as T78.8A, with their registry titles.
- T78 — Adverse effects, not elsewhere classified
- T78.0 — Anaphylactic reaction due to food
- T78.00A — Anaphylactic reaction due to unspecified food, initial encounter
- T78.00D — Anaphylactic reaction due to unspecified food, subsequent encounter
- T78.00S — Anaphylactic reaction due to unspecified food, sequela
- T78.01A — Anaphylactic reaction due to peanuts, initial encounter
- T78.01D — Anaphylactic reaction due to peanuts, subsequent encounter
- T78.01S — Anaphylactic reaction due to peanuts, sequela
- T78.02A — Anaphylactic reaction due to shellfish (crustaceans), initial encounter
- T78.02D — Anaphylactic reaction due to shellfish (crustaceans), subsequent encounter
- T78.02S — Anaphylactic reaction due to shellfish (crustaceans), sequela
- T78.03A — Anaphylactic reaction due to other fish, initial encounter
- T78.03D — Anaphylactic reaction due to other fish, subsequent encounter
- T78.03S — Anaphylactic reaction due to other fish, sequela
- T78.04A — Anaphylactic reaction due to fruits and vegetables, initial encounter
- T78.04D — Anaphylactic reaction due to fruits and vegetables, subsequent encounter
- T78.04S — Anaphylactic reaction due to fruits and vegetables, sequela
- T78.05A — Anaphylactic reaction due to tree nuts and seeds, initial encounter
- T78.05D — Anaphylactic reaction due to tree nuts and seeds, subsequent encounter
- T78.05S — Anaphylactic reaction due to tree nuts and seeds, sequela
- T78.06A — Anaphylactic reaction due to food additives, initial encounter
- T78.06D — Anaphylactic reaction due to food additives, subsequent encounter
- T78.06S — Anaphylactic reaction due to food additives, sequela
- 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
- T78.070D — 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
- T78.071 — 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
- T78.071D — 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
- T78.079 — Anaphylactic reaction due to milk and dairy products, unspecified
- 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
- T78.080 — Anaphylactic reaction due to egg with tolerance to baked egg
- T78.080A — Anaphylactic reaction due to egg with tolerance to baked egg, initial encounter
- T78.080D — 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
- T78.081 — Anaphylactic reaction due to egg with reactivity to baked egg
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: