As I have pointed out repeatedly here, things are not so neatly separable as that. The chemical context of the cell is at least as important.
The sequence in the DNA is what matters...
No more (and no less) than a forest, a hurricane, or a strip of beach -- but on the other hand, neither is it necessary to postulate the violation of any known physical law in order to explain these phenomena.
and it cannot be reduced to chemical or phsyical law.
So it has been asserted.
...the genetic code has the characteristics of proper code...
The basis for this assertion is: "necessary and sufficient conditions". This logical method may be traced to Plato, who believed that things have 'essences', and that it is possible to specify the necessary and sufficient conditions for membership in the class of things denoted by any concept. This basic idea of Plato’s had a profound effect on Western thought; it led people to think we could, just by thinking, say exactly what goodness or beauty or philosophy (or code) is.
Ludwig Wittgenstein revolutionized Western philosophy by arguing that this underlying idea is wrong. He points out that most concepts are open: i.e., that we define concepts in terms of paradigms, and argue that a particular thing either is or is not a member of the class in question on the basis of resemblance or lack of resemblance of the thing in question to the paradigm.
Even if we agreed to use Plato's "necessary and sufficient conditions", who gets to decide what those are? And who gets to determine when they have been met? How can they possibly hope to be met if critical terms remain undefined? It has been proposed that among the N&S conditions for 'code' is that: "A uniquely defined set of symbols is used". In an earlier response to that, I pointed out that the challenge of showing how biological systems utilize symbols (or even defining that term in a non-circular way) has yet to be met. I don't think defining 'code' as: "something which uses symbols", and 'symbols' as: "something used in a code" is going to get it.