[6] Initially the service had two streams, (i) General Duty Officer (GDO) and (ii) Specialists.

[8] There is a separate recruitment process by UPSC for the Specialist posts of the remaining sub-cadres.

General Duty Medical Officers of the CHS undergo their Foundation Training Program (FTP) at the National Institute of Health and Family Welfare (NIHFW), New Delhi.

Vacancy based promotion from a combined eligibility list of officers from all four sub-cadres of CHS Whenever an Indian Administrative Service (IAS) Officer is posted at the Centre at a particular Grade, the Batch of Officers of the Organised Group A Services who are senior by two years or more, and not yet promoted to that Grade are granted non-functional financial upgradation to that Grade.

[12] As per Rule 56 clause (bb) of the Fundamental Rules 1922, the age of superannuation of the Central Health Service (CHS) officers is 62 years, unless they exercise the option of posting to non-administrative posts, in case they desire to continue in their service up to the age of 65 years.