Coding Trend Analyses: Alzheimer's Disease

Project Title Coding Trend Analyses: Alzheimer's Disease
Date Posted
Wednesday, June 3, 2020

The purpose of this report was to compare the frequency of diagnoses for Alzheimer's disease using International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) versus International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) diagnosis codes. ICD-10-CM code definitions were determined by mapping from ICD-9-CM code definitions using the Centers for Medicare and Medicaid Services (CMS) General Equivalence Mappings (GEMs). Forward-backward mapping (FBM) was used to map ICD-9-CM to ICD-10-CM codes.(1)

(1) Fung, K. W., et al. (2016). "Preparing for the ICD-10-CM Transition: Automated Methods for Translating ICD Codes in Clinical Phenotype Definitions." EGEMS (Wash DC) 4(1): 1211.

Health Outcome
Alzheimer's disease
Time Period
October 1, 2010 - September 30, 2018
Data Sources
IBM® MarketScan® Research Databases
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