I got Soc. Security Disability payments, but @ full retirement was chgd to reg. soc. security. I'm still disabled, so for SC taxes is this disability retirement income?

South Carolina apparently does not tax disability retirement income -- but my current Soc. Security payment no longer shows as disability. When I became disabled, I received Soc. Sec. Disability payments, but when I reached my retirement age the Soc. Sec. was converted to regular retirement. (but I'm still disabled)