Pet Rx Express offers savings, added convenience with streamlined claims process at Walmart pharmacies Walmart is partnering with Nationwide, the nation’s largest pet insurer, to help families with pets save time and money when filling their pet prescription medications at the retail giant’s 4,700 pharmacies across the country. Nationwide Pet Rx Express gives pet insurance members access to affordable pet prescription medicines and introduces a new, expedited, in-store claims experience. Members can log into my.petinsurance.com to sign up for the program and access their digital ID card to present at the Walmart pharmacy. Preferred pricing and the opportunity to have claims for covered drugs processed at the counter of a major retail pharmacy is a first for the pet health insurance industry, according to Nationwide.