24 C.F.R. § 1005.807

There are three claim submission categories:

(a) Payment of the unpaid principal balance;

(b) Reimbursement of eligible reasonable expenses, including interest, from the Date of Default to the earlier of the deadlines provided in § 1005.839(a) through (e). Allowable reasonable exceptions will be provided by Section 184 Program Guidance; and

(c) Supplemental claim for eligible reasonable expenses incurred prior to the earlier of the deadlines provided in § 1005.839(a)(1) through (5), for expenses omitted from the Servicer's prior claim or for a calculation error made by either Servicer or HUD.