How do i contact peco customer service? General: PECO Customer Solution Center, 2301 Market Street, Philadelphia, PA 19103 Payment: PECO, P.O. Box 37629, Philadelphia, PA 19101 Other Programs & Services Language Assistance: 1-800-494-4000How can the pecos authorized official revoke an employers access? The PECOS Authorized Official can revoke an employer organization’s access to the provider organization’s enrollment information by contacting the External User Services (EUS) Help Desk. Contact information for the EUS Help Desk is available on the Contact Information Page.How do i update my pecos user account? If you are an inpidual practitioner, update your user account via the National Plan and Provider Enumeration System (NPPES). If you are an organization user, once you have logged into Internet-based PECOS, click the Account Management button and select the update user account information option.How do i get help logging in to pecos ai? ** If you are a Medicare Contractor and need assistance with logging a CRT or accessing PECOS AI, please contact your CMS representative (BFL). ** External User Services (EUS) is the primary help resource for the PECOS and I&A Medicare Provider communities, as well as providing login support for the IDM, NPPES and EHR systems.