Ruling on Working in Insurance Billing

Assalamu Alaikum wa Rahmatullahi wa Barakatuh, Respected Mufti Sahib, My name is Ammara and I am from Pakistan (Karachi). I work online for a doctor. My job is that when the doctor treats a patient, I prepare and send the treatment bill to the insurance company so that the doctor can receive payment for his services. Both the doctor and the patient have agreements with the insurance company. The insurance company pays a portion of the amount, the patient pays some part, and some amount is written off. My role is only to prepare and submit a truthful and original bill. I neither take nor give interest, nor do I calculate interest, and there is no fraud or dishonesty involved in my work. Is this type of job permissible for me according to Shariah or not? Jazakum Allahu Khairan. Ammara Karachi, Pakistan