Indian Medical Service
The Indian Medical Service (IMS) was originally established in each of the three Presidencies in the earliest days of the East India Company. The IMS was the senior of the medical services in British India. The three services were combined into one in 1897 under the control of the Government of India.
From the beginning, the "ranks" of the IMS were Assistant Surgeon, Surgeon, Surgeon Major. In 1892, these were combined with military ranks, such as Lieutenant, Captain and Major. Then, in 1898, the medical ranks were discontinued in favour of the military ranks.