Procedure Codes T1020 and T1022

Regarding procedure codes T1020 and T1022:

• Are these codes interchangeable? For example, can a claim be coded under T1022 instead of T1020 when the units billed under T1020 in a single day are very high (which incurs a cost higher than the T1022 rate)?
• Is there a difference in the qualifications of the person providing care between the two codes?
• When is the code to be used for a patient determined? Who and what factors determine the selected code?
• Any other relevant information, especially regarding T1022, would be helpful.