Indiana Code Title 20. Education § 20-24-5-4

Sec. 4. (a) Except as provided in this chapter, a charter school may not establish admission policies or limit student admissions in any manner in which a public school is not permitted to establish admission policies or limit student admissions.

(b) Notwithstanding subsection (a), a charter school may operate as a single gender school if approved to do so by the authorizer.  A single gender charter school must be open to any student of the gender the school serves who resides in Indiana.