Prince George’s County and Children’s National Medical Center, seeking to expand pediatric care in communities where many lack access to primary care, are slated to announce plans Wednesday for a new mobile health service.

The county, Children’s and Dimensions Healthcare, which operates Prince George’s Hospital Center in Cheverly, will focus on communities primarily inside the Beltway. Children’s already provides mobile services in the District.

The proposal comes as Prince George’s is in talks with the University of Maryland Medical System to build a $600 million new hospital, probably in the middle of the county.

Kurt Newman, Children’s president, said the van could be operating in the county in a few months. He said the mobile service will provide a team of physicians and other medical professionals and will make referrals for specialty care. The van is to make at least three trips a month to Prince George’s and could serve up to 30 children per visit, he said.

Children’s is also looking at expanding its specialized medical practices in the county, where it has several medical practices already Newman said.

There will be no cost to the county and patients will be billed for services, based on their access to insurance, including Medicaid.