The word "replacement" in the code descriptor does not always mean a removal is included.
63685 Insertion or replacement of spinal neurostimulator pulse generator or receiver,
direct or inductive coupling
63685 also says replacement but in this case per the NCCI policy they give an example of separate reporting for the removal---in this case "replacement" does not include "removal"
15. CPT codes 61885, 61886, and 63685 describe “insertion or replacement” of cranial or spinal neurostimulator pulse generators or receivers. CPT codes 61888 and 63688 describe “revision or removal” of cranial or spinal neurostimulator pulse generators or receivers. If the same pulse generator is removed and replaced into the same or another skin pocket, the “replacement” CPT code may be reported. The “removal” CPT code is not separately reportable. Similarly, if one pulse generator is removed and replaced with a different pulse generator into the same or another skin pocket, the “replacement” CPT code may be reported. The “removal” CPT code is not separately reportable. The “insertion or replacement” CPT code is separately reportable with a “revision or removal” CPT code only if two separate batteries/generators are changed. For example, if one battery/generator is replaced (e.g., right side) and another is removed (e.g., left side), CPT codes for the “insertion or replacement” and “revision or removal” could be reported together with modifier 59.