2026 ICD-10-CM Diagnosis Code T78.089A
Anaphylactic reaction due to eggs, unspecified, initial encounter
- ICD-10-CM Code:
- T78.089A
- ICD-10 Code for:
- Anaphylactic reaction due to eggs, unspecified, init
- Is Billable?
- Yes - Valid for Submission
- Code Navigator:
T78.089A is a billable diagnosis code used to specify a medical diagnosis of anaphylactic reaction due to eggs, unspecified, initial encounter. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026.
T78.089A is an initial encounter code, includes a 7th character and should be used while the patient is receiving active treatment for a condition like anaphylactic reaction due to eggs unspecified. According to ICD-10-CM Guidelines an "initial encounter" doesn't necessarily means "initial visit". The 7th character should be used when the patient is undergoing active treatment regardless if new or different providers saw the patient over the course of a treatment. The appropriate 7th character codes should also be used even if the patient delayed seeking treatment for a condition.
Unspecified diagnosis codes like T78.089A are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.
Approximate Synonyms
The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.
- Anaphylaxis caused by egg
- Egg white-induced anaphylaxis
Coding Guidelines
The appropriate 7th character is to be added to each code from block Adverse effects, not elsewhere classified (T78). Use the following options for the aplicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
New 2026 ICD-10-CM Code
T78.089A is new to ICD-10-CM code set for the FY 2026, effective October 1, 2025. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2025. This is a new and revised code for the FY 2026 (October 1, 2025 - September 30, 2026).
Replacement Code
T78089A replaces the following previously assigned ICD-10-CM code(s):
- T78.08XA - Anaphylactic reaction due to eggs, initial encounter
Code History
- FY 2026 - Code Added, effective from 10/1/2025 through 9/30/2026
