Should be OK that way.....I had that too for a couple years.
What will be critical is a question the software asks on one of the pages after the main 1099-R form is filled in. The question asks if you got regular payments for that 1099-R and you make that selection.... (The 1099-R shows total payout, but you received monthly or quarterly payments.....yes?) . Getting regular payments just means that you are receiving your normal pension...just a bit early, and that selection exempts you from any penalty. It is income for taxes though.
In the year you turn 39.5 years old, you'll likely get two 1099-R forms. One with a code 2 and one with a code 7. and the yearly total will divide up the before vs after age 59.5 $$.
No, you should not enter the code differently. You must select code 2, the code that is actually your Form 1099-R.
There is no difference between the handling of code 2 and code 7 on your tax return. If any of the distributions being reported with code 2 were actually made after you reached age 59½, contact the payer and have them correct your date of birth in the account records so that future distributions will be reported with code 7.