Authorities say cases in Philadelphia and New York have no connection to ongoing outbreaks.
Two people with reported exposure associated with the Texas and New Mexico outbreaks now have symptoms.
The patient may have exposed people at Washington Dulles International Airport and a pediatric emergency department in Maryland.
The measles outbreak in Texas rises to 198 cases, while New Mexico's outbreak climbs to 30 cases.
Texas health officials reported 13 more cases today, putting the state's outbreak total at 159.
In its latest update, the CDC says it has received reports of 164 cases from 9 jurisdictions this year.
Texas health officials say there have been 20 hospitalizations in the outbreak, which began in late January.
In other measles news, Kentucky has reported a case in an adult who had recently traveled internationally.
The unvaccinated, school-age child was hospitalized in Lubbock.
Nine of the state's counties have now reported cases, though most infections are from the Gaines County epicenter.
