Do chiropractor appointments count as medical expenses?

Yes, chiropractic is considered a medical expense. Please see this link for a complete list of medical expenses allowed. Medical expenses

Medical, dental, and vision expenses are reported on Schedule A and entered in the Deductions & Credits section:

1. With your return open, search for "Schedule A" and then click the "Jump to" link in the search results.
2. Answer Yes on the Did you have any medical expenses in 2019? screen.

You will then be prompted to enter your medical expenses, starting with prescriptions.

If you're using Free Edition and your medical expenses are large enough that you would benefit from itemizing deductions, you'll be prompted to upgrade to Deluxe, as Free Edition doesn't handle Schedule A.