Using Find-A-Codes NCCI editor I can see these may be billed together with a modifier, if appropriate.
The NCCI edit results state: Edit exists with 38221. 38220 is a Column 2 code. If both 38221 and 38220 are submitted, only 38221 will be paid. CPT code 38220 is a column 2 code and may be reimbursed if an NCCI-associated modifier is appropriate and used. You can find these results using the editor tool or on the code information page of either code.