What it is:
Box 24d is used to identify the medical services and procedures provided to the patient. Enter the CPT or HCPCS code(s) and modifier(s) (if applicable) from the appropriate code set in effect on the date of service. This field accommodates the entry of up to four two-digit modifiers. The specific procedure code(s) must be shown without a narrative description.
Therabill will use the Service Code and Modifier fields from the Billing & Coding section of the Edit Session dialog to populate box 24d.
From the dashboard click on the green New Session button. You will be on the Entering New Session page. Enter the service code and modifiers in the Service Code and Modifier fields for the services that will be/were performed.