The surgery was conducted on July 24 at the medical camp in Odisha’s Balasore district.
However, the government doctor’s mistake came to light only after a private practitioner examined Mamatarani Behera after she complained of acute chest and abdomen pain on Thursday.
Behera was one of the 90 women operated upon at the camp, but the others did not report any complications.
A tubectomy is a surgery that prevents pregnancies by blocking or severing a woman's fallopian tubes.
The woman’s husband, Bhagiratha Behera, said she was first taken to a hospital near their house and to a district hospital from there.
The 28-year-old was later shifted to a private hospital where it was found that her tubectomy procedure had gone wrong.
Despite a corrective operation, the woman’s condition deteriorated and she was referred to the SCB Medical College Hospital in Cuttack, where she is now battling for her life.
Admitting medical negligence, Balasore chief district medical officer Anup Ghosh said on Friday, “I found that the woman’s small intestine was cut during tubectomy. I will submit a report for further action in the matter.”