Answer: Alzheimer's disease with early onset. G30.0 is a valid billable ICD-10 diagnosis code for Alzheimer's disease with early onset. It is found in the 2019 version of the ICD-10 Clinical Modification (CM) and can be used in all HIPAA-covered transactions from Oct 01, 2018 - Sep 30, 2019. ā See below for any exclusions, inclusions or special notations.