T78.3 – Angioneurotic edema
ICD-10-CM 2027 diagnosis code · Other and unspecified effects of external causes
- Code
T78.3(claims format:T783)- Description
- Angioneurotic edema
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
- Block
- T66-T78 Other and unspecified effects of external causes
- Parent codes
- T78
Billable codes under T78.3
T78.3 is a header code and cannot be used on claims. Choose the most specific code:
7th character values
Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).
| Character | Meaning |
|---|---|
A | initial encounter |
D | subsequent encounter |
S | sequela |
Notes for T78.3
- Allergic angioedema
- Giant urticaria
- Quincke's edema
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
T78 – Adverse effects, not elsewhere classified
- The appropriate 7th character is to be added to each code from category T78
Block T66-T78
- , 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-)
Index terms for T78.3
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Angioedema
- Urticaria, giant
- Giant, urticaria
- Urticaria, larynx
- Bannister's disease
- Angioneurotic edema
- Urticaria, gigantea
- Edema, edematous, allergic
- Edema, edematous, periodic
- Quincke's disease or edema
- Edema, edematous, Quincke's
- Disease, diseased, Bannister's
- Edema, edematous, angioneurotic
- Edema, edematous, essential, acute
- Urticaria, with angioneurotic edema
- Edema, edematous, circumscribed, acute
- Allergy, allergic, angioneurotic edema
- Edema, edematous, glottis, glottic, glottidis, allergic
Related codes in T78
Frequently asked questions
What is ICD-10 code T78.3?
T78.3 is the ICD-10-CM code for angioneurotic edema, in the block T66-T78 (Other and unspecified effects of external causes).
Is T78.3 a billable code?
No. T78.3 is a header code with more specific child codes; report one of the billable codes listed above.
What category does T78.3 belong to?
It belongs to category T78 – Adverse effects, not elsewhere classified.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.