08/24/2026
R41.840 is a billable ICD-10-CM diagnosis code for attention and concentration deficit. It is used to document isolated difficulty focusing, sustaining attention, or processing information when a more specific diagnosis (such as ADHD or dementia) has not been established.
Clinical Usage & Guidelines
What it covers: Isolated attention issues, difficulty concentrating, and general "brain fog" without a confirmed underlying psychiatric or specific neurodegenerative disorder.
Billable status: Yes, it is accepted for medical reimbursement and insurance claims.
Common symptoms/presentation: Mental cloudiness, fatigue-related poor focus, or cognitive strain.
Exclusions & When NOT to Use
Do not assign R41.840 if a definitive condition better explains the symptoms. It excludes:
Attention-deficit hyperactivity disorders (ADHD) — use F90.-
Cognitive deficits as sequelae of a stroke or cerebrovascular disease — use I69.- codes
Mild cognitive impairment (when specifically diagnosed as such) — consider G31.84