## **What is the HCPCS code J1442 for?**
The HCPCS code J1442 is meant to designate the injection of the medicine called fligrastim (G-CSF) that doesn't have biosimilars, specifically a 1 microgram dose. Current procedural terminology also refers to this injection simply as a G-CSF injection or injection of filgrastim. It is also a J code. J codes are a massive group of codes meant to designate injections.
The purpose of fligrastim (G-CSF) is to inject a protein known as granulocyte colony-stimulating factor, which stimulates the body's capability of producing white blood cells to help combat any infections that may emerge.
But why would a person need this? There are certain conditions and treatments that lower the white blood cell count in a person. Examples include neutropenia (which is the condition of having a low blood cell count), radiation therapy and chemotherapy administration, and undergoing bone marrow transplants.
Please note that this is not a diagnostic injection, nor does it require intravenous formulation. It's an injection that is administered subcutaneously.
## **Documentation requirements for J1442**
As with any procedure, especially involving injecting drugs into patients, it's important to document the following before you file for a claim that includes this code:
- The full name of the healthcare provider/personnel who administered the injection + their credentials (use NOC codes, if required)
- The name and address of the facility where the injection was administered
- The full name of the patient
- The date and time of the drug administration by injection
- Patient records showing they have been diagnosed with neutropenia, cancer, or any condition that lowers the white blood cell count
- Patient records showing a history of chemotherapy, radiation therapy, or bone marrow transplants + medical necessity of those treatments
- Medical necessity of the physician's service of injecting fligrastim (G-CSF) that doesn't have biosimilars
- Blood tests showing white blood cell counts and results concerning related conditions
- Imaging test results showing locations and sizes of tumors (if any)
- The exact dosages and routes
## **Billing requirements for J1442**
Besides the documentation requirements above, please note the following billing requirements for this HCPCS code:
- They must reflect the dosage given over the course of the treatment.
- Use either of two modifiers: JW if there's unused medication in a vial (wastage), or JZ if there's no unused medication.
Since this injection is administered subcutaneously, please also use CPT code 96372.
Please follow the necessary guidelines mandated by Medicaid services/CMS to avoid claims from being rejected.
## **Other similar codes**
- **J1447** - Injection, tbo-filgrastim, 1 microgram
- **Q5101** - Injection, filgrastim-sndz, biosimilar, (zarxio), 1 microgram
- **J1628** - Injection, guselkumab, 1 mg
- **J9039** - Injection, blinatumomab, 1 microgram
- **J1745** - Injection, infliximab, excludes biosimilar, 10 mg
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