Maybe not, but if the EHR systems used in high-income countries are as universally awful as I've heard from doctors, and if GNU Health is at all better... I'd ask why not then!
EHRs in the USA, Germany and other countries with numerous health insurance providers are primarily there to ensure every service and tools used is billed fully (or overbilled).
GNU Health’s support for the whole set of pre-authorization, billing, payment, and related transactions seems to be...generating manual invoices.
Because people stand to lose profit if GNU Health is used.