Since your Married Filing Separately, you generally don't need to include your wife's marketplace insurance information on your tax return. Because you didn't have marketplace coverage yourself, and you're filing separately, you'll only report your own health insurance situation.
However, keep in mind that by filing separately, neither you nor your wife can receive the premium tax credit - even if she received advance payments during the year. Your wife will need to report her own marketplace coverage on her separate return and may need to repay any advance premium tax credits she received.
