Z23 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2026 edition of ICD-10-CM Z23 became effective on .
ICD-10 code Z23 for Encounter for immunization is a medical classification as listed by WHO under the range - Factors influencing health status and contact with health services .
Z23 is a valid billable ICD-10 diagnosis code for Encounter for immunization. It is found in the 2025 version of the ICD-10 Clinical Modification (CM) and can be used in all HIPAA-covered transactions from - .
This article delves deep into the world of cpt code Z23, moving beyond basic definitions to explore its multifaceted role in the modern healthcare ecosystem.
In the International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM), the Z23 diagnosis code is used to identify encounters for immunization. This code is assigned when a patient receives a vaccine, with no active disease symptoms present at the time of the visit.
Z23 is a billable diagnosis code used to specify a medical diagnosis of encounter for immunization. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from through .
Factors influencing health status and contact with health services (Z00-Z99) Z23 Encounter for immunization... The above description is abbreviated. This code description may also have Includes, Excludes, Notes, Guidelines, Examples and other information. The above description is abbreviated.
Z23 is appropriately used as the primary diagnosis code when the administration of the immunization is the sole reason for the patient’s visit. This applies when the patient comes in exclusively to receive a specific vaccine, such as a seasonal influenza shot or a required booster.