If work comp denies your claim, and if you have short term disability, you can pursue that. Give the short term disability people your Denial so they know that work comp is not paying. (even if your work comp case is in litigation). If you ultimately end up with work comp benefits, then work comp may be entitled to a credit to the extent the short term disability plan was funded by the employer.
For more info about Pennsylvania Work Comp and Short or Long Term Disability, call experienced PA Work Comp Lawyer, Michael W. Cardamone at 215-206-9068 or email email@example.com for a FREE and prompt consult.