Vikki Ahern, head of the CMS division that oversees private Medicare plans, announced the decision today, in a letter addressed to a Cigna executive and posted on the CMS website.
CMS shut Cigna’s Cigna-HealthSpring unit out of the Medicare drug market in January 2016.
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CMS said at the time that it was punishing Cigna-HealthSpring because it found serious problems with how the unit was choosing the drugs it covered, and how it handled enrollee complaints.
Cigna told CMS, in documents filed in March and April, that it has corrected the problems.
An independent auditor hired by Cigna conducted a validation audit, Ahern writes in the letter announcing the ruling.