34 Pa. Code § 125.211
Within 15 days after the receipt of an assessment notice issued against a self-insurer under Article IX of the act (77 P. S. §§ 1037.1-1037.8), the self-insurer may file objections with the Bureau if it believes the assessment is excessive, erroneous, unlawful or invalid. The objector shall state in detail the grounds for the objections. The Bureau, after notice to the objector, will hold a hearing upon the objections. After the hearing, the Bureau will record its findings on the objections and will transmit to the objector, by registered mail, notice of the amount, if any, charged against it in accordance with the findings. That amount shall be paid by the objector within 10 days after receipt of notice of the findings unless the objector initiates an action in the appropriate court within 10 days after receipt of the Bureau's notice to restrain the collection or payment of the assessment.
34 Pa. Code § 125.211