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Related Concept Videos

Dementia01:30

Dementia

Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
The progression of dementia is generally gradual.
Dementia l: Introduction01:22

Dementia l: Introduction

Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
Formulating and Validating Nursing Diagnosis II01:25

Formulating and Validating Nursing Diagnosis II

Nursing diagnoses represent a problem validated by major defining characteristics. There are four categories of nursing diagnoses: problem-focused, risk, health promotion or wellness, and syndrome. The anatomy of a nursing diagnosis includes three components: problem statement or diagnostic label, defining characteristics, and related factors.
Risk nursing diagnoses represent clinical judgments of an individual, family, or community more vulnerable to developing the health problem than others...
Intellectual Disability01:29

Intellectual Disability

Intellectual disability (ID) is a neurodevelopmental condition characterized by deficits in intellectual and adaptive functioning that manifest during the developmental period. This condition encompasses challenges in reasoning, memory, problem-solving, and learning, accompanied by impairments in everyday life skills, such as communication, self-care, and social interactions. Intellectual disability affects approximately 1% of the population in the United States, impacting an estimated 5...
Formulating and Validating Nursing Diagnosis I01:26

Formulating and Validating Nursing Diagnosis I

A nursing diagnosis is written when the nurse recognizes a cluster of essential patient data indicating health problems treated with independent nursing interventions. The standardized terminologies of a nursing diagnosis help nurses identify and treat patients' problems. Every electronic health record that uses nursing diagnosis must employ standard diagnostic terminology. Developing an efficient, individualized care plan begins with accurate nursing diagnoses.
There are thirteen domains for...
Alzheimer's Disease: Overview01:26

Alzheimer's Disease: Overview

Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ and tau...

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Related Experiment Video

Updated: May 27, 2026

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index
06:55

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index

Published on: January 8, 2020

Performance of ICD-10 code-based dementia case definition in the Health and Retirement Study.

Kan Z Gianattasio1, Michael Steffan1, Ben Reist1

  • 1NORC at the University of Chicago, Washington, District of Columbia, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|May 26, 2026
PubMed
Summary

Medicare claims data for dementia are useful but have limitations. The Dementia DataHub (DDH) shows diagnoses vary by location and patient factors, impacting dementia surveillance accuracy.

Keywords:
AD/ADRDICD codesMedicareclinical diagnosissurveillancevalidation

Related Experiment Videos

Last Updated: May 27, 2026

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index
06:55

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index

Published on: January 8, 2020

Area of Science:

  • Gerontology
  • Epidemiology
  • Health Services Research

Background:

  • The Dementia DataHub (DDH) utilizes Medicare data for U.S. dementia prevalence and incidence.
  • Interpretation challenges arise due to geographic and participant-specific variations in diagnostic accuracy.

Purpose of the Study:

  • To evaluate the performance of Dementia DataHub (DDH)-defined Medicare claims diagnoses.
  • To compare DDH diagnoses against Health and Retirement Study (HRS) survey-based dementia classifications.

Main Methods:

  • Linked Health and Retirement Study (HRS) and Medicare claims data were analyzed.
  • Performance metrics (sensitivity, specificity, accuracy) were assessed for DDH dementia definitions.

Main Results:

  • The DDH likely-or-higher dementia definition showed 50% sensitivity, 97% specificity, and 91% accuracy against HRS.
  • Performance varied significantly across geographic census divisions and by urbanicity.
  • Dementia cases missed by Medicare claims tended to be in younger, healthier individuals.

Conclusions:

  • Medicare claims offer insights into dementia treatment patterns but frequently miss cases.
  • Discrepancies in diagnosis vary by geography and patient characteristics, offering opportunities for improved surveillance.
  • Adjusting for diagnostic variation can enhance the utility of Medicare data for dementia epidemiology.