- August 27, 2025
- Posted by: Josh Knoll
- Category: Infusion Billing Services
The overall infusion market has grown exponentially over the last few years and almost 3.2 million patients now depend on home or on-site infusions every year. A major portion of these patients are seniors and many of them live with chronic issues, requiring frequent treatments. The whole volume of infusion billing services has increased substantially as more patients require treatments outside the hospitals.
The current rise demands accurate infusion billing services. Add-on codes are assigned to bill extra hours and each given drug. Your practice may either lose money or face claim denials because of missing or assigning inaccurate codes.
Providers who have a clear idea about using CPT codes can easily see a clear difference in their revenue foundation. The need for your infusion billing service will only continue to increase with more chronic diseases projected over the next few years. It is really important to understand what CPT add-on codes are and why these codes matter in your infusion billing services.
Know what CPT add-on codes are:
CPT add-on codes are the additional billing codes that you need to assign with the primary procedure codes to show additional services. You assign the main infusion CPT code to tell the payer that you started the service, while the add-on codes show that you continued for more time or added another drug. You can only show the first hour or the first drug without add-on codes, thus ending up with incomplete payments and revenue loss.
Related Reading: Overcome Your Billing Challenges in 2025 with Expert Infusion Billing Company
Why do add-on codes actually matter in your infusion billing services?
The entire infusion billing itself is based on time. Most codes only cover the first hour, but your patients may stay for several hours and need more than one infusion drug. The Payer will always think that the service ended within an hour when you only use the primary code. CPT add-on codes enable you to correctly capture the additional hours, multiple drugs and even a situation where two drugs administered sequentially. Just imagine this situation: one of your cancer patients is receiving chemotherapy for three hours, and you are using two different drugs. You can still get paid for only one hour and one drug for using just the initial code. You can always receive the optimal payments for your additional hour and drugs by assigning proper add-on codes, keeping your cash flow strong.
Infusion billing follows a strict hierarchy. The type of drug and service determines which code becomes the primary code and which are add-ons. Here are the hierarchy rules that you need to follow-
The add-on codes hierarchy rules to follow:
It is always vital to follow a set order for coding. The order should be like this: the chemotherapy or highly complex drugs code comes first, then diagnostic or therapeutic infusions, and finally, a hydration infusion code should come. You should always maintain the proper hierarchy, as you will always face claim denials because of mixing up the order. Here is a simple example- one of your patients has received one hour of chemotherapy along with hydration. You need to first use 96413 as the primary code for defining the chemotherapy and then assign 96361 as the add-on code for capturing the hydration service. Your claim may get rejected if you somehow bill the hydration first. You can always ensure clean claims, prompt payments and minimal denials by always following the right hierarchy.
You can actually improve your coding process quite a bit by knowing some of the frequently used CPT add-on codes in infusion billing services.
Commonly used CPT add-on codes in infusion billing services:
Some of the common add-on codes that you need to know are-
- 96361 showing the additional hydration hour after 96360
- 96367 for a newly given drug after the first one
- 96368 for documenting a concurrent infusion where you run two drugs at the same time
- 96415 for documenting an additional chemotherapy hour after using code 96413, and 96417 for reporting a new chemotherapy drug given sequentially.
You should always assign these codes carefully to capture the important services and ensure a strong revenue structure.
No wonder add-on codes are powerful; many practices struggle with them. Here are common issues:
The common challenges of using add-on codes in infusion billing services:
Common mistakes in infusion billing include poor documentation when nurses don’t record start and stop times. Another mistake is misunderstanding time rules by billing an extra hour even if it was only 15 minutes. Practices also use add-on codes as primary codes, which causes rejection. You can also face claim denials for missing codes for concurrent infusions when two drugs run at the same time. Each of these errors leads to lost revenue.
Missing a few add-on codes may not seem like much, but the loss adds up fast. For example, if a clinic runs 20 infusion sessions a week and each patient gets an extra hour that isn’t coded, that’s $150 lost per session. The clinic loses $3,000 in a week, and in a year, that’s $156,000 gone. This is why using add-on codes correctly helps infusion practices earn more and face fewer denials.
Fortunately, you can still take control of your add-on codes by following some vital tips mentioned below.
The crucial practices for using add-on codes in infusion billing services:
Your backend team should always document the start and stop times to assign the right add-on codes. You can also follow the “greater than half” rule, where you can bill an additional hour if you complete more than 30 minutes. The coding staff should also know how to follow the hierarchy rule so that they can clearly understand which code is primary and avoid mistakes in using the add-on codes. Also, never forget to run regular audits to catch any potential errors and ensure perfect coding and billing mechanisms.
Many practices still face difficulties in handling billing on their own and opt for outsourcing to a professional infusion billing company. Experts in a professional billing company always know what it takes to follow the proper hierarchy rules, assign the right add-on codes and prevent denials. You can always save your staff time, remain compliant, and ensure optimal reimbursements by hiring the perfect outsourcing partner.
Are you already looking forward to hiring a perfect billing partner? We are here for you.
Related Reading: Stop Treating Biologics Like Easy Kids: Call An Infusion Billing Company!
SunKnowledge: The most trusted infusion billing service partner
We, at Sunknowledge, always know what it takes to make a big difference in your infusion billing services. Our experts always understand what it takes to handle the entire complex billing requirements for cancer and other infusion treatments and make sure all the claims are submitted correctly on time. Our top-notch billing service always enables your practice to save almost 80% costs compared to managing an in-house team. Do not waste your time and give your financial side a strong boost with our best-in-class infusion billing service at $7 per hour.