ICD-10-CM T78.3 is the diagnosis code for Angioneurotic edema. This code falls under the section "Other and unspecified effects of external causes" within Chapter 19 — Injury, poisoning and certain other consequences of external causes (S00-T88). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as T78.3. They are mutually exclusive:
Understanding where T78.3 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, T78.3 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
T78.3 is the ICD-10-CM diagnosis code for "Angioneurotic edema". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T78.3 is T78 ("Adverse effects, not elsewhere classified"). T78.3 provides a more specific classification within this category.
T78.3 is located in Section T66-T78 — "Other and unspecified effects of external causes" within Chapter 19 of the ICD-10-CM Tabular List.
Use T78.3 when the patients documented diagnosis matches "Angioneurotic edema" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Angioneurotic edema is T78.3.
Yes, T78.3 can be used as a primary diagnosis code since it is billable and specific.
T78.3 is in Chapter 19 of the ICD-10-CM Tabular List.
Type 1 Excludes for T78.3 include: serum urticaria (T80.6-); urticaria (L50.-).
Yes, T78.3 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.