139 - Entity's health maintenance provider id (HMO). Usage: This code requires use of an Entity Code

This rejection message from the payer is mentioning a provider ID.  Usually, this is referring to a provider's NPI.  You will want to verify the NPI that you have on file for the following providers that may be on claims.  Make sure the NPI you are providing is the same NPI that the payer has on file.

• Rendering Provider - Your rendering providers can be found in Therabill by clicking Providers in the top navigation bar and going to your Provider List.
• Referring Provider - The referring provider is listed on the edit client form under the section "Referring Provider".  Since the rejection message is mentioning HMO, you may also want to verify that this is the patient's physician from their HMO.
• Billing Provider - By default, this is the information that you have entered under Admin in the top navigation of Therabill.  If you have set up Groups or are using Insurance Company Specific Billing Provider Information, then you will need to look in the corresponding location for the billing provider NPI.

In rare instances, some payers require legacy IDs to be put on claims.  If you find this to be the case for this payer, then you will want to add the legacy ID for the rendering provider on the edit provider form under the "Legacy ID's" tab.