Your question is not an easy one because as you have figured out, there is not a straight forward answer. I have reviewed the taxable and non-taxable items on the Ohio Dept. Taxation website and other sources. Based on the following information, it appears that the services that your company provides are not taxable. SEE BELOW:
Most Services Exempt
Ohio generally does not tax sales of professional, personal or insurance services. But the state legislature has designated a select group of services as taxable. Services subject to sales tax include rental of hotel and motel rooms, rental of personal property, landscaping, security services, janitorial and exterminating services, employment services, health and recreation clubs, installation and repair services, laundry and dry cleaning, towing, telephone services including prepaid phone cards, 900-number services, Internet and data networking services, satellite TV, snow removal, storage lockers, and personal appearance services other than hair care.
Taxable services subject to sales tax in Ohio:
Refer to following link: http://www.tax.ohio.gov/faq/tabid/6315/Default.aspx?QuestionID=434&AFMID=11354
My thought is that if all of the services provided relate to an insurance claim, those services would not be taxable. I don't see the taxation department separating out all of the services relating to individual insurance claims. To be on the safe side, my suggestion is to call the Dept. of Taxation and speak to a specialist in the sales tax deparment to find out for certain.
Let me know if I can be of further assistance to you regarding this matter.