5. Scope; Application to "Account Debtor." This section deals only with the rights and duties of "account debtors"-and for the most part only with account debtors on accounts, chattel paper, and payment intangibles. Subsection (e) [Maine cite subsection (5)] provides that the obligation of an insurer with respect to a health-care-insurance receivable is governed by other law. References in this section to an "account debtor" include account debtors on collateral that is proceeds. Neither this section nor any other provision of this Article, including Sections 9-408 and 9-409 [Maine cite sections 9-1408 and 9-1409], provides analogous regulation of the rights and duties of other obligors on collateral, such as the maker of a negotiable instrument (governed by Article 3), the issuer of or nominated person under a letter of credit (governed by Article 5), or the issuer of a security (governed by Article 8). Article 9 [Maine cite Article 9-A] leaves those rights and duties untouched; however, Section 9-409 [Maine cite section 9-1409] deals with the special case of letters of credit. When chattel paper is composed in part of a negotiable instrument, the obligor on the instrument is not an "account debtor," and Article 3 governs the rights of the assignee of the chattel paper with respect to the issues that this section addresses. See, e.g., Section 3-601 (dealing with discharge of an obligation to pay a negotiable instrument).

§9-1405.__Modification of assigned contract

(1)__A modification of or substitution for an assigned contract is effective against an assignee if made in good faith.__ The assignee acquires corresponding rights under the modified or substituted contract.__The assignment may provide that the