"HMA" is not an IRS term. It is not the same as an HSA.
However, there is a company that helps employers offer health benefits in the Pacific Northwest - see https://www.accesshma.com/
It is likely that this is a health benefit set up by your employer for you through this company.
However, I cannot tell whether it is an HSA or HRA or MSA or FSA or even another plan - ask your employer.