Retirement tax questions

In your case there will only be one code in box 7 - a "1" if you are under age 59 1/2 or a "7" if older.  For your purpose, if the distribution is to be converted to a Roth, the difference between 1 & 7 is immaterial since there is no early distribution penalty applied for a conversion.  (There could be an early distribution penalty if under age 59 1/2 and not all of the distribution was converted to a Roth and there is a code 1).

If you want to see all of the possible codes for both boxes see the 1099-R instructions:
<a rel="nofollow" target="_blank" href="https://www.irs.gov/instructions/i1099r#idm139679928890256">https://www.irs.gov/instructions/i1099r#...>
"Guide to Distribution Codes".   The code in the left column would go in the top box 7 and if another code that is listed in the right most column applies the it would go in the bottom box 7.  There can be a maximum of 2 codes.

For example a code 1 and a code 8 would indicate an early distribution (code 1) of an excess contribution to a retirement plan (code 😎 such as a 401(k).  

 None of the 2 code 7's apply to a Traditional IRA distribution.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**