As used in this article, “self-funded” means a multiple employer welfare arrangement that undertook at all times and for a continuous period of five years to reimburse health benefit costs incurred by covered persons pursuant to the benefits and coverages provided by their plan exclusively from plan assets. “Partially self-funded” means a multiple employer welfare arrangement that undertook at all times and for a continuous period of five years to reimburse health benefit costs incurred by covered persons pursuant to the benefits and coverages provided by their plan exclusively from plan assets, provided, however, that these benefits are reimbursable to the multiple employer welfare arrangement by stop loss insurance only to the extent that the benefits exceed fifty thousand dollars ($50,000) per claim.