T78.3XXA Angioneurotic edema, initial encounter

Instructional Notes:

T78.3XXA
Description: Angioneurotic edema, initial encounter
↓
T78.3
Description: Angioneurotic edema
Exclude1:
- serum urticaria (T80.6-)
- urticaria (L50.-)
Inclusion Term:
- Allergic angioedema
- Giant urticaria
- Quincke's edema
↓
T78
Description: Adverse effects, not elsewhere classified
Exclude2:
- complications of surgical and medical care NEC (T80-T88)
↓
T66-T78
Description: Other and unspecified effects of external causes (T66-T78)
↓
S00-T88
Description: Injury, poisoning and certain other consequences of external causes
Exclude2:
- birth trauma (P10-P15)
- obstetric trauma (O70-O71)
Notes:
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
Use Additional Code:
- code to identify any retained foreign body, if applicable (Z18.-)