REM sleep disorder (SNOMED-CT) V1.3

To identify Parkinson's disease, a code list was created by José Ignacio Cuitún Coronado (Senior Research Associate in Medical Statistics and Applied Health Data Science, University of Bristol) and reviewed by Elizabeth Coulthard (Professor of Cognitive Neurology, University of Bristol).

Step 1. We searched for the following key terms:

• REM sleep disorder
• Parasomnia
• REM behaviour disorder
• rapid eye movement
• Rapid eye movement sleep behaviour disorder -Restless leg
• Sleep disorder

Step 2. We excluded irrelevant codes (e.g., codes indicating a prevalent diagnosis or where the diagnosis was unclear):

(A) Codes that identify a prevalent diagnosis:

• History of

(B) Codes that do not relate to the person:

• Family history

(C) Codes where the diagnosis is unclear:

• Assessment
• At risk
• Attendance
• Battery
• Tool
• Referral
• Invite / invitation

(D) Codes excluded upon review by the clinician:

• Society
• Committee
• Medication (partial exclusion)
• Substances (partial exclusion)
• Drugs (partial exclusion)
• Measure / measurement / test / scale questionnaire
• Non-rapid eye movement sleep, function
• Rapid eye movement dreaming, function
• Rapid eye movement sleep, function
• Repeated rapid eye movement sleep interruptions
• Restless legs

No medication/drug/substance(s) were removed unless there was a clear example from the clinician.