Yes. The IRS has indicated (https://www.irs.gov/pub/irs-wd/1228037.pdf) that all Medicare premiums are similar to other health insurance, and that this deduction rule extends to Medicare premiums for coverage of a self-employed individual’s spouse, dependent, or child under age 27.
A retirement plan that meets tax law tests and allows for tax deferment and tax-free accumulation of income until benefits are withdrawn. Pension, profit-sharing, stock bonus, employee stock ownership, and Keogh plans and IRAs may be qualified plans.