The 43-year-old new mother, known as Priscilla, was unable to pay her bill after having the babies at Queen Charlotte’s and Chelsea Hospital in White City.
She claimed she planned to give birth in Chicago after being warned Nigerian hospitals did not have the “facilities to cater for the children”.
However, the heavily pregnant woman was turned away by US border officials and went into labour three months early during her return to her home country in November.
Priscilla, who underwent IVF treatment to help her conceive, is now living in a London hostel run by a charity while her two surviving babies, Elijah and Esther, remain in hospital. One child died shortly after birth and another, Deborah, died on Saturday.
Her husband is unable to travel to the UK due to a further lack of funds.
The family’s shocking story was featured on BBC 2 documentary Hospitals on Wednesday which exposes the pressures of health tourism on the trust.
When first warned of the high treatment costs by overseas visitor manager Terry Facey, she says: ‘I didn’t plan to come here. ‘It’s only money. Money can’t buy life. The last bill I had was £331,000 but – even if I worked every day – I would never earn that much money. My kids are priceless.’
Mr Facey, who has worked at the trust for 12 years trying to collect bills for overseas patients, says: ‘Those invoices are going to be huge … 20 grand a week for each baby in intensive care.
This is sad and heartbreaking.