CONCORD, N. H.— Theodoros Bahtsevanos, 32, of Haverhill pleaded guilty in federal court this week to prescription fraud and false identity document charges, United States Attorney Scott Murray said.

According to court documents and statements made in court, Bahtsevanos passed false prescriptions for Adderall, a controlled substance, at pharmacies in Nashua and Derry twice during May 2018.

The prescriptions had forged signatures but actual DEA registration numbers for physicians, and were issued to aliases Bahtsevanos was using at the time, investigators said.

When Bahtsevanos was arrested, police said he was found with nine fake driver’s licenses from states all over the country.

Each fake license had his photograph and used a different alias, police said.

Police said they also found Bahtsevanos with a ledger book used to track various DEA registration numbers, physician’s names, and fake recipients that he used to fill prescriptions for Adderall throughout New Hampshire.

Investigators found that he filled more than 90 fake prescriptions as part of the scheme.

Bahtsevanos is scheduled to be sentenced Sept. 16.

“Protecting the integrity of our health care system is a high priority of the U.S. Attorney’s Office,” Murray said. “Those who obtain prescription drugs by fraudulent means divert drugs from their intended uses and may contribute to the unlawful drug trade. We will continue to work with our law enforcement partners to identify and prosecute those who participate in unlawful schemes to obtain prescription drugs.”