Maradona died from a heart attack last month, aged 60.
Responding to a lawsuit filed by a woman who says Maradona could be her father, the court said a DNA sample of the footballer must be submitted.
He had two daughters from a marriage. After his divorce he recognised paternity of six more children.
The case was brought by a 25-year-old, Magalí Gil, who is not among them.
Ms Gil, who was adopted, says her birth mother contacted her two years ago to say that her father "may be Diego Maradona".
In a video posted on Instagram, Ms Gil said it was a "universal right" to know "if Diego Maradona is my biological father or not".
After his death on 25 November, Maradona was buried in a private cemetery near Buenos Aires.
A court ruled on 30 November at the time that his body must not be cremated until all necessary forensic tests had been carried out.