Prison officials said he was admitted to the ICU of the hospital two-three days ago.
They have been arrested for aiding Shahabuddin in writing the law exam.
The court said that after casting his vote, he would be immediately taken back to Siwan jail.
For the moment, Siwan is once again Shahabuddin's home.
Shahabuddin is an accused in the kidnapping and murder of Communist Party of India-ML worker Munna Chaudhary three years ago.
Ramadhar Singh, the jailor of Siwan jail where Shahabuddin is currently lodged, has filed an FIR against Shahabuddin for abusing, misbehaving and threatening him.
Bihar administration sounded a nation-wide alert on Tuesday for execution of non-bailable warrants of arrest, pending against the elusive Rashtriya Janata Dal member of Parliament Mohammad Shahabuddin.
Bihar's upcoming elections are marked by the significant presence of candidates from political families, raising questions about ideological commitments and democratic principles.
The RJD MP, who has been evading arrest for the past two months and has eight non-bailable warrants against him, said that he would approach court for justice.
Rashtriya Janata Dal member of Parliament Mohammad Shahabuddin on Saturday filed a petition in the Patna high court challenging Siwan district magistrate's order barring him from entering the district for one year.
M I Khan finds out why the dreaded Mohammad Shahabuddin's widow wants to leave the north Bihar district where her husband's word was once law.
The former RJD leader was released on bail in the Rajiv Roshan murder case after 11 years, reports M I Khan.
Non-bailable warrant issued against the Siwan MP following his failure to appear before the court despite several summons for framing charges in connection with an abduction case.
The ruling National Democratic Alliance on Friday secured a thumping majority in the Bihar Assembly, winning 202 seats in the 243-member House, as results for all the constituencies were declared by the Election Commission.
Ex-RJD MP has been charged with murder and criminal conspiracy in the killing of journalist Rajdeo Ranjan.
Nitish Kumar had a week's time to prove his majority, but Laloo Yadav made full use of Siwan don Mohammad Shahabuddin. A revealing excerpt from Rajesh Singh's Baahubalis Of Indian Politics: From Bullet To Ballot.
A proclamation and property attachment notice was on Monday pasted at the house of Laddan Mian, a close associate of jailed ex-Rashtriya Janata Dal MP Mohammad Shahabuddin, in connection with the murder of a journalist in Siwan earlier this month.
Surajbhan Singh was named in the report as a conspirator on whose instigation the Chunnu Singh gang allegedly shot dead RJD leaders Akhilesh Rai and Ram Udesh Rai on April 13, 2006, under Mushari police station.
He was not comfortable with the bahubali politician's presence in Siwan after his release.
Mohammad Shahabuddin is also being tried in 29 other cases.
Rajdeo, who was the Siwan bureau chief of the newspaper, was shot dead on May 13 at a busy fruit market near Siwan railway station.
Siwan jail officials denied that a selfie was clicked by Shahabuddin and said some "well-wisher" who might have come to meet him could have taken the photo and posted it on the social media.
He was medically examined then shifted him to jail number 2, whose other notable inmates include gangster Chhota Rajan.
Shahabuddin approached three senior lawyers, of whom Jethmalani has reportedly agreed to argue his case.
The government is mulling moving the Supreme Court for cancellation of his bail even as opposition National Democratic Alliance on Wednesday demanded his arrest in the journalist Rajdeo Ranjan murder case.
A special court in Siwan, Bihar awarded life imprisonment to jailed former Rashtriya Janata Dal Member of Parliament Mohammad Shahabuddin and three others on Friday, finding them guilty of abduction and murder of two brothers 11 years ago.
We're not responsible for his release, says JD-U after BJP's attack.
Ranjan was one of the 23 people named in the 'death warrant list' issued in 2007. Seven of them have been killed so far.
Rashtriya Janata Dal chief Lalu Prasad on Friday reacted strongly against Bharatiya Janata Party president Amit Shah's 'crackers in Pakistan' remark, saying it was an insult to the people of Bihar.
The widow of Rajdeo Ranjan, the journalist who was gunned down, has said the killers had a connection with someone in jail.
Bihar Health Minister Tej Pratap defiantly said that he doesn't recognise each person he clicks a photograph with.
Mohammad Shahabuddin, in prison for over a decade, still inspires fear, a reminder of the 'jungle raj' when political murders were commonplace in Bihar.
The accused say a close aide of former RJD MP Shahabuddin gave them a supari to kill Ranjan.
Majority of these constituencies are in Uttar Pradesh and the party that is on the third slot even as the counting is still underway on several seats is the Bahujan Samaj Party, a party neither with the National Democratic Alliance nor the opposition INDIA bloc.
Many bahubalis have fielded their wives and relatives as proxies.
'I have nothing more to lose. My three sons were killed. I am not going to sit silent.'
In a poor village of daily wage earners in Siwan, Bihar, people speak about their hard lives and why they vote.
He was accorded a hero's welcome by supporters of his parents.
'At least 6,000 people attended a meal at Shahabuddin's residence in a feast to celebrate his bail. As if the community has no other priorities of channelising such funds for better purposes!,' says Mohammad Sajjad.