Norwich Union has acquired Rehabilitation UK, a centre for evidence-based treatment of personal injury.
The insurer said the acquisition would support Norwich Union Healthcare (NUHC) and would extend its capability in occupational health and rehabilitation services.
The case management service will be delivered by Norwich Union Occupational Health and Dr Martin Strudley, the founder of Rehabilitation UK, will become director of rehabilitation.
Tim Baker, commercial director at Norwich Union Healthcare, said: "NU has been working with Rehabilitation UK for a number of years.
"This move will allow us to utilise Rehabilitation UK's expertise in the area of rehabilitation and work with their network of physiotherapists and psychological therapists to promote evidence-based approaches to support a wider variety of cases."
The case management company will streamline the referral and treatment process, shortening the overall claim life cycle and reducing costs.
Dr Martin Strudley, director of rehabilitation, NU Occupational Health, said the development of rehabilitation services within the private sector was providing crucial support the work of the NHS.