Yes, cooperate with your PIP carrier's inquiries about your car accident treatments, but be cautious when communicating with the adjuster. Provide brief and to the point answers about how your recovery is progressing. Avoid giving specific daily details, as the insurance company is looking for reasons to limit payments on your personal injury claim. Do share about your progress and improvements, but in a general way. If there's no progress reported to the insurance company, that can lead to the adjuster requiring you to attend an Independent Medical Exam (IME), which often results in the insurance company stopping payment for your medical treatment.