Final answer:
The life insurance policy provision that prevents the insurer from modifying a policy after it has been issued is the incontestability clause.
Step-by-step explanation:
The life insurance policy provision that prevents the insurer from modifying a policy after it has been issued is known as the
incontestability clause
.
This provision is included in the policy to protect the policyholder's rights and ensure that the terms and conditions of the policy remain consistent throughout the insured period.
The incontestability clause typically states that after a certain period, typically two years, the insurer cannot contest the validity of the policy due to misrepresentation or non-disclosure by the policyholder.