The Washington Post Co.’s Kaplan higher-education division will close nine campuses and consolidate four others into existing nearby locations, the company said in a Securities and Exchange Commission filing. The company said it would stop new enrollments at the nine campuses it is closing, but that it would continue teaching the students currently enrolled there.

The company did not give a reason or identify the campuses, but in an Aug. 7 SEC filing it disclosed that an accrediting commission had warned three campuses (in Baltimore, Indianapolis and Dayton, Ohio) that they could lose accreditation “for failure to meet certain student achievement threshold requirements” and had asked for the school to respond by September. A loss of accreditation would mean the Kaplan campuses would no longer be eligible for Title IV loans from the Education Department, the source of nearly 90 percent of Kaplan higher-education revenue.

The company said revenue at the campuses to be closed represent approximately 4 percent of total revenue for Kaplan higher education and 2 percent of the total Kaplan division, which includes other educational operations. The Post Co. said Kaplan expects to incur an estimated $18 million in restructuring costs, a portion of which would be recorded in third-quarter earnings, with the remainder recorded through the end of 2013.

Kaplan has about 70 campuses, and about a third of the division’s 67,605 students as of June 30 were on Kaplan ­higher-education campuses, with most of the rest of them studying through online programs.