Creditable coverage generally includes period of coverage under an individual or group health plan not followed by a break in coverage of 63 days. Creditable coverage excludes liability, limited scope dental, vision, specified disease or other supplemental-type benefits.
The Federal definition of creditable coverage can be found at:
http://law.justia.com/us/cfr/title45/45-1.0.1.2.61.2.33.2.html