Per the IRS Instructions for Schedule A (Form 1040), page 8:
Line 13 Mortgage Insurance Premiums
Qualified mortgage insurance is mortgage insurance provided by the Department of Veterans Affairs, the Federal Housing Administration, or the Rural Housing Service, and private mortgage insurance (as defined in section 2 of the Homeowners Protection Act of 1998 as in effect on December 20, 2006).
Limit on amount you can deduct. You cannot deduct your mortgage insurance premiums if the amount on Form 1040, line 38, is more than $109,000 ($54,500 if married filing separately). If the amount on Form 1040, line 38, is more than $100,000 ($50,000 if married filing separately), your deduction is limited and you must use the Mortgage Insurance Premiums Deduction Worksheet to figure your deduction.