How was the disability income you received reported to you? A Form 1099 or a Form SSA-1099?
Please clarify what kind of tax document your disability benefits are reported on. You say that you did not receive a 1099. Did you get a W-2?
@Nickmorton777 And...another thought...if you received workman's compensation, there will be no tax document for that, because workers comp is not taxable and is not entered on a tax return.
Q. I was on disability for part of the year. Where do I report this income?
A. You probably don't have to report it, at all. It depends on the source of the income
If you receive a form W-2 or 1099, for the income, it is taxable and you enter those documents to report it. For a detailed explanation, see:
https://ttlc.intuit.com/community/disability/help/is-disability-income-taxable/00/26023