Proving Medical Necessity: Effective Documentation for Rehab Therapists

By Julie Schwarzenegger, Senior Director of Account Management, Net Health Rehab Therapy

If you can’t write a skilled note, was the treatment you provided your patient truly skilled?

Whether you work in the skilled nursing setting, like I did for 20-plus years, or you work with patients in an outpatient setting, this question underscores the core of what we do as therapists. It’s not just about delivering care — it’s about proving that the care provided is both medically necessary and genuinely skilled.

Where do we prove that? In our documentation.

When I look back at my time as an occupational therapist (OT) who worked in skilled-nursing rehab operations, one thing became very clear: if your documentation doesn’t paint a clear picture of why your treatment required the expertise of a licensed clinician, then you’re leaving your work open to doubt and scrutiny.

The Centers for Medicare & Medicaid Services (CMS) doesn’t care that a patient completes 10 reps of an exercise. They care about whether those 10 reps are connected to improving functional performance — gait or ADLs (activities of daily living), for example — and why only a skilled therapist could guide that process.

In this post, I want to share some tips that helped me and my teams document more effectively and ensure that our notes left no room for doubt about the necessity of our services. Because at the end of the day, it’s not just about compliance — it’s about proving the value of what we do for our patients.

The Importance of Medical Necessity in Rehab Therapy

Medical necessity is the backbone of what we do as therapy clinicians. If we don’t prove that our treatments are necessary — that they require the skills we’ve spent years learning and honing — then what value are we offering? The answer to this question must be documented in the medical record and readily available to Medicare and other payers to ensure just payment and prevent post-payment denials.

Whether you’re working in skilled nursing, outpatient, private practice, or another setting, documenting medical necessity isn’t just about ticking boxes. It’s about showing that the care we’re delivering is tailored to the patient’s specific needs and long-term goals.

Here’s the thing: one-size-fits-all treatment plans just don’t cut it. I can’t tell you how many times I’ve reviewed plans of care that looked exactly the same across patients, even though their situations were completely different.

Take two patients with hip fractures — one from falling off a roof while putting up Christmas lights, and the other from tripping while using a walker. On paper, their injuries are the same, but their treatment plans should most definitely not look the same. Each patient’s plan must reflect their unique history, their functional goals, and their overall wellness levels.

For example, if you spend time in the rehab gym and observe an assembly line style of treatment with all OT patients doing the rainbow arc, weighted dowel exercise, and hand-bike, it’s a red flag. Where is the clinical reasoning in determining the optimal treatment plan to maximize performance and outcomes?

If your documentation doesn’t clearly explain why you’re doing what you’re doing, CMS is going to question it — and so should you. Your goal when documenting care should be to paint a picture of each patient’s situation so clearly that someone reading it can understand not just what you did, but why the skills of a therapist were necessary to perform the treatment.

Always ask yourself, “Does this treatment plan reflect the individual needs of this patient?” If it doesn’t, it’s time to dig deeper. Get to know your patient — their home environment, their daily challenges, what they need to do to live independently — and make sure your documentation reflects that. If we can’t demonstrate medical necessity through our individualized treatment plans, we’re not just failing ourselves; we’re failing our patients.

Tips for More Effective Documentation

Now, let’s discuss how you can improve your documentation. Despite the pressures of maintaining productivity and documenting within the structure of a specific electronic health record (EHR), it’s not just about filling in blanks or meeting some arbitrary standard.

Effective documentation is about proving the necessity of your work and showing that your treatment required the skills and knowledge of a licensed clinician. The more clearly you can connect your interventions to your patient’s unique needs, the stronger your documentation will be.

Here are some practical steps you can take to solidify your documentation—things you can start doing today to ensure that your documentation not only tells the story of your patient’s journey but also proves your value as a clinician.

Link Every Treatment to Function

One of the biggest mistakes you can make is documenting exercises or interventions without linking them to functional goals. Medicare doesn’t care that, as in the aforementioned example, your patient completed two sets of 10 reps of an exercise; they care about what those reps are going to help the patient do in their daily life. If you’re not tying every treatment session back to function, you’re missing the mark.

For example, instead of just noting that a patient completed exercises to strengthen their lower extremity, document that those exercises are intended to strengthen the anterior tibialis for the purpose of normalizing steppage gait and reducing foot drop during stance phase therefore maximizing independence and reducing the risk of falls.

Always ask yourself: What is this treatment going to help the patient do? If you can’t answer that question, take a step back. Make sure you’re showing the reasoning behind each exercise or intervention. The clearer the link between the treatment and the functional outcome, the stronger your case for medical necessity.

Use the Right Language to Differentiate Skilled vs. Unskilled

Your documentation must reflect that the care you’re providing requires not just skill, but a level of skill that only a licensed therapist can provide. Using language that accurately reflects this higher level of skill can be the difference between proving medical necessity and getting dinged for providing what looks like unskilled care.

For example, “encouraged the patient” is not skilled. Anyone can encourage. Instead, document in terms of why your interventions were necessary. Use phrases like “provided manual assistance to facilitate weight shifting” or “offered verbal cues to improve upper extremity coordination during dressing.”

The key is to use language that highlights the specific clinical skills involved. A Certified Nursing Assistant (CNA) can help a patient ambulate down the hall, but only a trained therapist can optimize a patient’s gait pattern or provide cues on proper sequencing when learning to use a new assistive device. Likewise, a CNA can monitor a patient for coughing during a meal, but only a speech-language pathologist (SLP) can assess carryover of swallowing strategies and their effectiveness in reducing vallecular pooling and potential for aspiration.  If your notes don’t make these types of distinctions clear, CMS may rightfully question whether the treatments were truly skilled. So, always choose your words carefully.

Avoid Duplication of Services in Interdisciplinary Teams

Duplication of services is a big red flag for CMS. So, when you’re working as part of a care team, it’s important to ensure that your documentation reflects the unique contributions of each discipline.

For example, if both a physical therapist and an occupational therapist are working with a single patient, the documentation should clearly reflect how each discipline approaches the task differently. The PT might document working on sit-to-stand transfers to improve mobility, while the OT should frame it as facilitating functional independence with dressing or toileting.

The bottom line is each therapist’s work must be distinct, and your documentation needs to prove that. If CMS sees the same treatment across two disciplines with no differentiation, they might see it as a duplication of services, which could lead to denials. So, clarify your role and always relate it back to the patient’s functional goals in a way that’s specific to your discipline.

Use Diagnosis Codes that Support Medical Necessity

The codes you choose matter. Selecting the right diagnosis code is about more than just billing — it’s about backing up the necessity of your treatment. If you’re not careful, you could choose codes that don’t fully support your clinical work, leaving your documentation vulnerable to denials.

Always ensure the codes you use align with the specific impairments and functional deficits you’re addressing. For example, if you’re working on a patient’s balance to prevent falls, make sure the diagnosis code reflects that.

Remember, coding is part of telling the full story. The better your codes reflect the patient’s condition and the interventions you provide, the stronger your case for medical necessity. If the codes and documentation don’t align, you’re leaving room for doubt, which can result in denials.

Navigating the Future of Documentation

As we look ahead, it’s clear that rehab therapy documentation is entering a new era. EHR systems are rapidly evolving to support clinicians through intuitive templates, automation, and cutting-edge advancements like AI-powered ambient documentation.

These innovations hold tremendous promise. Ambient documentation, in particular, is poised to revolutionize the way therapists capture clinical encounters—passively transcribing conversations, reducing manual data entry, and freeing up time for patient care. With the right tools in place, clinicians can expect greater efficiency, reduced burnout, and more time to focus on what matters most: treating patients.

Despite the promise of AI, many clinicians remain cautious—and understandably so—about accuracy, data security, and the risk of over-reliance on automation. These challenges must be addressed collaboratively by vendors and providers alike to build trust and ensure that these tools enhance, rather than compromise, the clinical process.

Successful adoption of these tools depends not just on the technology itself, but on equipping therapists with adequate training and support to integrate them effectively into daily workflows. Therapists must feel confident using these tools and understand how to leverage them while still applying their clinical expertise to every patient interaction.

But with all this progress comes responsibility. While AI can streamline workflows and help tell the patient’s story more efficiently, it’s still up to clinicians to ensure that the story being told is accurate, individualized, and supports medical necessity. Tools like templates and automation can guide documentation, but they can’t replace the clinical judgment and reasoning that form the foundation of skilled care.

Now is the time for rehab leaders to proactively shape how these technologies evolve—ensuring they serve clinical realities, not just technical possibilities. As these tools continue to mature, it’s vital for rehab operations and leadership teams to work in close partnership with their EHR vendors. This collaboration ensures that the documentation tools not only enhance productivity but also empower clinicians to paint a clear, complete picture of the care provided—beyond automated suggestions or pre-filled fields.

Ultimately, no matter how smart our systems become, the clinician’s voice remains the most critical part of the record. Establishing medical necessity will always require thoughtful documentation that reflects the complexity, skill, and value of the services delivered. With the right balance of innovation and clinical accountability, we can embrace the future of documentation without compromising the integrity of our work.