Popondetta General Hospital CEO Dr Gunzee Gawin has confirmed that all post mortems were completed on the weekend.
He said of the 16 hospitalised, the first four were discharged last Thursday while another two were discharged on Friday.
Dr Gawin added that only 10 remain in the ward and in a very stable condition.
The post mortem was done by Senior Forensic Pathologist Dr Philip Golpak and assisted by Dr Josephine Chanoan from Port Moresby.
The doctors returned to Port Moresby yesterday.
The fatal road accident happened last Monday which claimed 13 lives, in what is believed to be the biggest road accident recorded in the province in terms of the number of people that died and casualties.
The accident involved a PMV truck and a Higaturu Oil Palm fruit truck.