HD-Charge: Indirect and Out-of-Pocket Costs of Huntington's Disease in the United States

Inclusion Criteria for HDGECs: * Identified as an active participant in Enroll-HD (participants who have completed their last on site Enroll-HD visit within approximately 15 months) * Able to provide online or written informed consent. A LAR for HDGEC can provide written consent, if applicable * Identified as a participant with clinically diagnosed HD and has a CAG length ≥ 40 * Site PI has access to HDGEC's medical records for the purpose of completing the Resource Utilization Questionnaire * Able to speak and understand both verbal and written English * Has adult onset of disease (disease symptoms manifested at age 20 years or older) * Has access to a computer/tablet/smartphone (if compatible) and internet services Stage classification of HDGECs: 1. Early stage HDGEC: CAG length ≥ 40; DCL = 4, TFC ≥ 11 2. Middle stage HDGEC: CAG length ≥ 40; DCL = 4, 7 ≤ TFC ≤ 10 3. Late stage HDGEC: CAG length ≥ 40; DCL = 4, 0 ≤ TFC ≤ 6 Exclusion Criteria for HDGECs: HDGECs will be excluded from the study if they have significant cognitive or any other impairment sufficient to interfere with study associated tasks as judged by the Site PI or Site PI's designee (exceptions will be made if a companion/LAR completes the survey on their behalf). Inclusion criteria for companions: * Able to provide online or written informed consent * Identified as the primary provider (unpaid) of supportive care of an HDGEC (HDGEC must be an Enroll-HD participant and have a CAG length ≥ 40 and have adult onset of disease (disease symptoms manifested at age 20 years or older)) * Able to speak and understand both verbal and written English * Aged 21 years or older at time of survey * Has access to a computer/tablet/smartphone (if compatible) and internet services and has the technical skills required to complete an online survey Exclusion Criteria for companions: Companions will be excluded from the study if they are identified as paid or salaried caregivers; however, the HDGECs for whom they care may still be included in the study.