Coding Confusion Continues: Custom-Fitted Versus OTS

Despite years of clarification attempts, the line between custom-fitted and off-the-shelf (OTS) orthoses remains one of the most misunderstood and frequently denied coding issues in O&P. Let’s break it down. What Do the Codes Actually Mean? [caption id="attachment_269224" align="alignright" width="304"] Vera/stock.adobe.com[/caption] According to Medicare’s Local Coverage Determination (LCD L-33686) and Policy Article A-52457, custom-fitted orthoses must involve modification beyond minimal self-adjustment. That means bending, molding, trimming, or otherwise adapting the device to meet the specific anatomical and or functional needs of the patient by a qualified individual with expertise makes it a custom-fitted device. OTS orthoses, on the other hand, may allow for minimal adjustments like straps or simple length changes and are expected to be adjustable without expertise. In other words, it’s not just about what you did, but who did it, how, and whether the documentation proves it. Why Does Medicare Use Sister Codes? Many orthoses have two HCPCS codes—one for the OTS version and one for the custom-fitted version. These are known as sister codes. While the physical device may be the same, CMS uses separate codes to: Distinguish clinical expertise: Was a trained professional required to customize the fit? Control overpayment: Both codes typically reimburse the same, discouraging “upcoding” to custom unless it’s appropriate. Collect utilization data: CMS tracks how often providers bill custom-fitted versus OTS and uses that data for audits and policy changes. Preserve pricing flexibility: CMS can adjust reimbursement for one code without affecting the other, such as for competitive bidding. So even though the reimbursement is often the same, choosing the wrong sister code—and failing to document it properly—can lead to denials, audits, and paybacks. Why Is This Still So Confusing? Even with definitions in place, the gray area remains huge. Here’s why: Lack of knowledge. There are products that can be either OTS or custom-fitted depending on how they’re modified, but there’s often little guidance on documentation requirements, and there is a lack of self-auditing within the facility. Clinical customization is often undocumented. The orthotist may trim and mold a brace during fitting, but the chart only says it was “fit to patient.” The documentation—not the device—drives the decision. Reviewers can’t infer customization. If it’s not explicitly stated in the clinical note, they’ll default to OTS—even if the patient clearly needed a custom fit. What Payers Want to See To support a custom-fitted code, your documentation should include: A detailed description of how the orthosis was modified and what special equipment was required to trim, mold, bend, etc. The idea is that most people, including patients, are unable to do it themselves, and it requires the skills and specialized equipment of a credentialed professional. Why the modification was medically necessary for that specific patient Who performed the modification (name and credentials) A clear date of service and signature Alignment with your coding and modifiers (KX, RT/LT) Generic notes or templated language like “fit to patient” are no longer sufficient. And remember, if you check the KX modifier, you’re telling the payer, “I confirm that the documentation meets all coverage criteria.” If that’s not true, you’re taking on risk. How to Get It Right Here are a few simple steps to reduce denials and stay compliant: Train your team. Clinicians, billing staff, and front office personnel should understand the difference between OTS and custom-fitted and know what documentation is required, including what to look for in the documentation when approving the claim to bill. Use smarter templates. Incorporate prompts that guide clinicians to document how the orthosis was modified, by whom, and why. Perform internal audits. Pick ten recent claims and check to see if the documentation would support the code billed. You might be surprised. Clarity Is Possible (But Only If You Write It Down) We all want the same thing: patients receiving the right orthosis, with the right fit, and providers getting paid fairly for their expertise. But the burden is on us to clearly document that what we provided meets the definition of the code we billed. Understanding why Medicare created sister codes—and what documentation they require to satisfy the criteria—helps us make smarter decisions, improve compliance, and reduce frustration. Erin Cammarata is president and owner of CBS Medical Billing and Consulting. She can be contacted at erin@cbsmedicalbilling.com .

Coding Confusion Continues: Custom-Fitted Versus OTS

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Coding Confusion Continues: Custom-Fitted Versus OTS

What Do the Codes Actually Mean?

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From Paperwork to Patient Care: AI in O&P

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