## **What is HCPCS code S9131 for?**
There are many HCPCS codes to choose from for personal care services, because they encompass a wide variety of services provided by various specialists (e.g., licensed practical nurses, certified nurse assistants, etc.). There are several HCPCS codes specific to physical therapy services, one of which is HCPCS code S9131, which refers to physical therapy services provided in the home, per diem.
What does "physical therapy, in the home, per diem" even mean? This code means that the physical therapy procedure involves a licensed physical therapist providing physical therapy services to their patient in their home. "Per diem" means that the services are billed daily for a specified period.
The services provided are meant to deal with the following problems or conditions that the patient has:
- If they have mobility issues due to injuries or neurological conditions
- If they're currently recovering from surgery
- If they require chronic pain management
The physical therapist providing the service will work to relieve any pain the patient feels. If they're recovering from injury or surgery, they will do what they can to ensure the patient's recovery process is smooth. Other goals include reducing the likelihood of the patient falling down while they're mobile, improving their overall mobility, improving or completely restoring their mobility and functioning, and/or strengthening endurance and muscle strength.
## **Documentation requirements for S9131**
As with any service provided, the service provider needs to document everything accordingly. For S9131, the physical therapist who provided the service must document the following:
- The physical therapist's full name and credentials (must be a qualified physical therapist)
- The patient's full name
- The patient's medical history
- The patient's current and prior functional status
- The date of home service
- Start and stop times of the home service, including the total amount of time spent providing the service
- Diagnostic tests conducted (if any)
- Initial assessment findings
- Therapeutic procedures, rehabilitation services, exercises, and techniques employed during the visit
- Tools, mobility, and home health aides used
- Treatment plans and goals established
- Patient experience (e.g., exertion, comfort, pain management)
- Medical necessity of the services provided
All documentation must be retrievable for audits and reimbursement purposes.
## **Billing requirements for S9131**
Besides the documentation requirements above, it must be clear that the service is done by a qualified physical therapist, not any other type of specialist (e.g., a qualified occupational therapist, nurses, etc.).
This code is for home-based physical therapy, which means the services should have been provided in the patient's home, not anywhere else, like physical therapy or nursing facilities.
The patient has to be homebound and/or unable to make it to a physical therapy facility.
If these requirements are not met, then you can't use this code for billing and reimbursements at all, even with proper documentation. The context and situation of the patient are important.
## **Other similar codes**
- **S9123** – Nursing care, in the home; by registered nurse, per hour (use for general nursing care only, not to be used when CPT codes 99500-99602 can be used)
- **G0151** – Services performed by a qualified physical therapist in the home health or hospice setting, each 15 minutes
- **G0152** – Services performed by a qualified occupational therapist in the home health or hospice setting, each 15 minutes
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