April 19 (Reuters) - UnitedHealth ( UNH ) CEO Andrew

Witty will testify before a U.S. House subcommittee on May 1

about a recent cyberattack at the company's technology unit and

its impact on patients and providers, the Energy and Commerce

Committee said on Friday.

The hack at Change Healthcare, a provider of healthcare

billing and data systems, on Feb. 21 disrupted payments to

doctors and healthcare facilities nationwide for a month.

"We look forward to learning more on what happened in the

lead up to, and in the weeks following, the attack," said Cathy

Rodgers, energy and commerce committee chair, and Morgan

Griffith, chair of the subcommittee on oversight and

investigations.

"This hearing will help inform the committee as we continue

working toward solutions that protect the health and well-being

of all Americans."

Individuals and smaller providers, in particular, have

struggled financially following the cyberattack, threatening

critical access for patients, they added.

Earlier this week, UnitedHealth ( UNH ) said it expects the hack to

cost the company up to $1.6 billion this year.