The Indian Railway Medical Service (IRMS) is an organized Group 'A' service (cadre) of the Government of India. The officers of this service are responsible for providing comprehensive health care to the serving railway employees, retired railway employees and their dependents as well as other categories of staff such as contractors, vendors and licensed porters.
The cadre is headed by a Director General, Railway Health Service (DG/RHS) reports to the Railway board at Rail Bhawan, New Delhi.
At the Railway board level, the DG/RHS is assisted by Principal Executive Director , Executive Directors, Director/Health and Family welfare, Director/Industrial Health and other officers.
At the Zonal level, the operations of the medical services are headed by a Principal Chief Medical Director (PCMD) who acts as the administrative head of the entire zone. The PCMD is assisted by Chief Health Director (CHD) and by Additional Chief Medical Director (ACMD) & Dy. Chief Medical Directors (Dy.CMD).
At the divisional level, the operations are headed by a Chief Medical Superintendent (CMS). In some divisions, Additional Chief Medical Superintendent (ACMS) or Medical Superintendent (MS)-in-charge head the functioning of the medical department.
At the sub-divisional or peripheral level, the operations might be headed by Additional Chief Medical Superintendent (ACMS) or Senior Divisional Medical Officers (Sr.DMO) and in some cases, by the Divisional Medical Officer (DMO).