Core medical services include surgery, internal medicine, pediatrics, and obstetrics and gynecology.

Over the past decade, several new, specialized areas have been added or expanded: Evangel Hospital was started in 1959 and was the vision of a SIM missionary, Dr Lonnie Grant.

SIM approved the project and the British Plateau Provincial Office subsequently permitted to build the hospital in Jos on the present site.

In 1970, a missionary surgeon, and medical director of the hospital in Jos, Dr Jeanette Troup, died from Lassa Fever after performing an autopsy on someone who had the disease.

Dr Phil Andrew, a SIM Australian missionary, started the General practice (US: Family Physician) training program in 1982, with one resident.