There are not additional forms that need to be included, but there are specific addresses. Please see below.
The instructions for filing 9465 directly in this IRS document: https://www.irs.gov/pub/irs-pdf/i9465.pdf -
"If you have
already filed your return or you’re filing this form in
response to a notice, file Form 9465 by itself with the
Internal Revenue Service Center using the address in the
table below that applies to you."
