Back glass damage repair
How to recover black glass damage on my phone ?
iPhone 13 Pro Max, iOS 16
Question marked as
Same as front screen
arrange a repair
iPhone Service & Repair - Apple Support
Or
Contact - Official Apple Support
Anything other than Screens or Battery may be a replacement phone and the price is in the article under "Other damage"
See also: Get your iPhone, iPad, or iPod touch ready for service - Apple Support