If my activity is relevant to more than one ABIM specialty, can I document that in PARS?

Yes, it is possible!  In PARS (the Program and Activity Reporting System), you will attest that your activity meets the American Board of Internal Medicine’s (ABIM) Medical Knowledge Assessment Recognition Program requirements.  After you do this, PARS will prompt you to indicate one or more specialties represented by ABIM that best relate to the activity.