SEATTLE (Reuters) - An Oregon woman whose doctor convinced her that he could cure her lower back pain by having sex with her is suing him and his medical clinic for $4 million, according to legal documents obtained on Monday.

The doctor, Randall Smith, who was 50 at the time, was stripped of his license and sent to jail for 60 days last year for charging the state's Oregon Health Plan $5,000 for his 45-minute "treatments" involving the woman.

"Dr. Smith's medical treatment included intercourse in which he told plaintiff was needed to help alleviate plaintiff's lower back and lower extremity pain," the former patient said in the lawsuit.

The lawsuit, which charges battery, negligence and intentional and negligent infliction of emotional distress, was filed on Friday in Multnomah County court.

"We never comment on lawsuits," said a spokesman for the Adventist Medical Group clinic in Gresham, Oregon where Smith worked. Smith could not be located for comment.

Though he pleaded guilty to submitting false health care claims, a felony, Smith maintained the sex with the 47-year-old woman was consensual.

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