You should choose "7-Normal Distribution", because that's
what it is.
For whatever reason, the OPM changes the wording to "7 - NONDISABILITY",
but a code 7 is a code 7.
If you received a 1099-R, this means that you took some money out of the pension (probably to use for "something else"). Did you not receive a distribution in 2017 from this OPM pension? If so, you have to report it as taxable income.
