The agency has alleged that Balkrishna submitted fake educational certificates and other documents to obtain a passport and accused him of violating provisions of the Passport Act by doing this.
The agency had also made a judicial request to Nepal government asking it to ascertain Balkrishna's nationality details but no response has come so far, CBI sources said here.
Not getting any information, the CBI has filed its charge sheet before the special court based on its probe in the case.
The CBI had registered a case of cheating and criminal conspiracy against him on July 23 for allegedly procuring fake degree and violation of section 12 of Indian Passport Act for furnishing fake documents to get a passport.
The decision to register the case against Balkrishna was taken after Sampurna Nand Sanskrit University denied ever having him on its rolls.
Registrar of the university Rajnish Shukla had told the CBI that Balkrishna's two degrees 'Purv Madhyma', a high school degree issued in 1991, and 'Shastri', a Sanskrit degree in 1996, don't figure in the varsity's records.
He said the CBI had matched records which showed that the enrolment numbers mentioned in the fudged documents belong to a different student.