Electronic health records can support dementia care research in 2026, but they miss many people with mild cognitive impairment. Mild cognitive impairment, or MCI, means memory or thinking changes that are noticeable yet do not prevent daily independence. That gap shapes study design and limits. Researchers must prove where their records came from, how complete they are, and whether key diagnoses were checked.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What do health records capture about MCI?
- Who gets missed in record-based studies?
- What marks a strong record-based study?
- What can patients and caregivers do now?
- Frequently Asked Questions
What do health records capture about MCI?
Health records capture visits, codes, prescriptions, and test orders. They often lack the full story of early memory change. Many older adults with early symptoms never receive a diagnosis code.
Two national studies cited in the 2025 Alzheimer's Association Facts and Figures report estimate 17% to 22% of Americans age 65 and older have mild cognitive impairment, described in the Association summary. A review of adults 65 and older seen in 59 primary-care clinics found dementia or MCI on record review in only 8.6% of the group, reported in the Journal of the American Geriatrics Society and indexed in the PubMed record. Coded records alone missed cases without extra review and tuning.
Who gets missed in record-based studies?
Routine records miss a large share of true Alzheimer cases. Missed diagnoses fall hardest on Black, Hispanic, and Asian American patients, linked to access gaps, stigma, and clinician bias. UCLA researchers reported that pattern in Patient Care Online, based on work in npj Digital Medicine, in the Patient Care report.
Families should read a "no diagnosis" in a portal as incomplete, not as proof of normal cognition. Risk tools can repeat the same gap. External testing of the eRADAR record-based risk score in two health systems found it can flag undiagnosed dementia, but the authors warned that underdiagnosis in Black and Hispanic patients creates uneven outcome errors, reported in the Journal of General Internal Medicine in the full study text.
What marks a strong record-based study?
Strong studies document data source, data quality, record linkage, and checks of key variables. The Food and Drug Administration finalized guidance in July 2024 directing sponsors that use health-record or claims data for drug effectiveness or safety decisions to document those steps, published as the Federal Register notice. Look for chart review, cognitive test results, or linked data, not codes alone.
Large linked resources help, but size does not fix missing diagnoses. The National Institutes of Health reports that its All of Us program now includes data from more than 747,000 participants, with over 535,000 whole-genome sequences linked to nearly 482,000 health records. Large cohorts expand MCI research, yet sampling still depends on who seeks care and receives testing.
What can patients and caregivers do now?
UCLA tested a semi-supervised learning method on records from more than 115,000 adults to find likely undiagnosed Alzheimer cases with higher sensitivity and smaller racial-ethnic gaps than standard models. Better detection is possible, but families still need direct follow-up when symptoms persist.
Medicare covers the amyloid-targeting drugs lecanemab and donanemab for early Alzheimer's only when physicians enroll patients in a CMS-approved registry such as ALZ-NET, according to current Alzheimer's Association treatment guidance. Ask the clinic whether it participates and what record follow-up enrollment requires.
- Ask for cognitive concerns to be recorded in words, not only as a code.
- Bring a medication list, visit history, and examples of daily change.
- Ask whether a memory clinic, neuropsychological test, or research referral fits.
- Keep copies of test dates, scores, imaging orders, and referrals.
Frequently Asked Questions
Does a clean health record rule out MCI?
No. Early change often goes uncoded, so ongoing symptoms deserve direct testing and follow-up.
Why do researchers ask for more than diagnosis codes?
Codes miss cases. Chart notes, test scores, prescriptions, and linkage checks give a fuller picture.
How does registry enrollment affect treatment access?
For covered early Alzheimer's amyloid drugs, Medicare requires enrollment through a CMS-approved registry such as ALZ-NET.
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