Overseas NHS and care workers can claim their reimbursement from the surcharge

"The government’s Tier 2 health and care visa, launched in August, exempted eligible staff from paying the IHS. The new reimbursement scheme goes further to ensure that staff not covered by the visa, but who have worked in the NHS or care sector since 31 March, are able to claim reimbursement for themselves and their dependants, even if they paid the surcharge before this date."


"Applicants will need to apply for reimbursements on a 6-monthly basis, when they have worked for at least 16 hours per week over the full 6 months. These reimbursements will be processed in 6-month instalments in arrears."

"The reimbursement scheme is designed for claimants who are in the UK on visas that give them a generic right to work. Examples of this may include:

    a dependant of a UK national or another migrant
    someone on a Tier 4 student visa who can undertake up to 20 hours of work a week during term time
    someone on the Tier 5 youth mobility scheme"

https://www.gov.uk/government/news/health-and-care-staff-can-claim-immigration-health-surcharge-reimbursement


Guidance
https://www.gov.uk/government/publications/immigration-health-surcharge-applying-for-a-refund

If you are on a Tier 2 (General) work visa and would get an IHS refund as you could have applied for the new Health and Care visa, this 6 month in arrears scheme is not for you. You qualify for an IHS exemption, see below-


If the applicant is in the UK on a Tier 2 (General) visa, working in an eligible health or social care occupation, meaning they would benefit from exemption under the health and care visa offer, they should not claim a reimbursement through this scheme. Instead they should contact the Home Office at IHSrefunds@homeoffice.gov.uk to claim a refund, for any time remaining on their visa after 31 March 2020.
https://www.gov.uk/government/publications/immigration-health-surcharge-applying-for-a-refund/immigration-health-surcharge-guidance-for-reimbursement-2020#purpose-of-guidance