T78.3XXA: Angioneurotic edema, initial encounter
T78.3XXA is a billable, specific ICD-10-CM code for angioneurotic edema, initial encounter. It is valid for submission on a claim.
Check T78.3XXA with the rest of the claim: free scrubber7th character "A": initial encounter
The appropriate 7th character is to be added to each code from category T78
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Allergic angioedema
- Giant urticaria
- Quincke's edema
Excludes1 inherited from the categories above T78.3XXA
A category’s note binds every code beneath it.
Excludes2 inherited from the categories above T78.3XXA
Not part of this code, but both may be coded when both are present.
Other codes that can never be billed with T78.3XXA
Their own Excludes1 notes name this code, so the conflict is not listed above.
- T75Other and unspecified effects of other external causes
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
T78.3XXA is named in 17 Medicare coverage policies: 17 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A56558Billing and Coding: Allergy Testing
- A56612Billing and Coding: CT of the Head
- A56625Billing and Coding: Echocardiography
- A56844Billing and Coding: RAST Type Tests
Code history
Unchanged in every release from FY2024 to FY2027.