55 Pa. Code § 41.72 – Answers to petitions to intervene.

(a) A party may file an answer to a petition to intervene, and in default thereof, may be deemed to have waived an objection to the granting of the petition.
(b) Answers shall be filed within 20 days after the date of service of the petition, unless for cause the Bureau with or without motion prescribes a different time.
(c) Subsections (a) and (b) supersede 1 Pa. Code § 35.36 (relating to answers to petitions to intervene).

This section cited in 55 Pa. Code § 41.81 (relating to consolidation of provider appeals).