If easing your pain involved floating in warm water instead of wobbling down a hallway, you’d probably say,
“Sign me up.” That’s the basic idea behind aquatic therapy. But if you’re on Medicare, the real question is:
Will Medicare help pay for it, or is this coming straight out of your wallet?

The good news: Medicare does cover aquatic therapy in many situations. The not-so-good news: coverage comes
with rules, definitions, and more fine print than your average pool waiver. Let’s walk (or wade) through
exactly when aquatic therapy is covered, what it costs, and how to avoid billing surprises.

What is aquatic therapy, exactly?

Aquatic therapy (sometimes called aqua therapy or hydrotherapy) is a form of physical or occupational therapy
that takes place in a pool or similar water environment under the supervision of a licensed therapist. It’s
not just “going for a swim.” Sessions are structured, goal-oriented, and tailored to a specific medical
condition.

In Medicare and insurance language, aquatic therapy is often billed under CPT code 97113, which refers to
therapeutic exercises performed in water, usually one-on-one, in blocks of 15 minutes. The therapist uses
buoyancy, resistance, and warmth to help you work on things like strength, range of motion, balance, and
walking patterns that may be too difficult (or too painful) on land.

• It’s done in a controlled setting, not a hotel pool.
• It must be part of a written treatment plan created by a qualified professional.
• The goal is to treat a diagnosed condition, not just to “get in shape.”

Quick answer: When does Medicare cover aquatic therapy?

Here’s the short version: Medicare generally covers aquatic therapy when it counts as medically
necessary physical or occupational therapy, ordered by a Medicare-participating provider, and delivered by a
qualified therapist in an appropriate setting.

In practical terms, that usually means all of the following need to be true:

• Your doctor or other Medicare-approved provider has diagnosed a condition that affects your function
  (for example, arthritis, recovery from a joint replacement, stroke, back pain, or balance problems).
• Aquatic therapy is prescribed as part of a formal treatment plan and is considered medically necessary,
  not optional or “nice to have.”
• The therapy is provided by or under the supervision of a licensed physical therapist or occupational
  therapist who can bill Medicare.
• The pool or facility meets safety and clinical standards for therapy (for example, appropriate temperature,
  infection control, and accessibility).
• Your progress and ongoing need for therapy are documented in your medical record.

If those boxes are checked, Medicare will typically treat aquatic therapy the same way it treats land-based
physical or occupational therapy sessions.

How Medicare covers aquatic therapy, part by part

Medicare Part A: Hospital or skilled nursing facility stays

Medicare Part A deals mostly with inpatient care. If you’re receiving aquatic therapy during a covered
hospital stay or at a skilled nursing facility (SNF) where therapy is part of your
rehab program, the cost of those sessions is generally wrapped into the Part A benefit. You don’t pay a
separate bill just for the pool time.

However, Part A coverage only applies while you meet Medicare’s rules for inpatient or SNF care (such as
needing daily skilled care and not just long-term custodial care). Once you’re discharged or no longer meet
those criteria, you’re usually shifted to outpatient therapy under Part B if you still need aquatic sessions.

Medicare Part B: Outpatient aquatic therapy

Most people encounter aquatic therapy under Medicare Part B, which covers medically necessary
outpatient physical and occupational therapy. Under Part B:

• You must first meet the annual Part B deductible (the exact amount changes every year).
• After that, Medicare typically pays 80% of the approved amount for therapy, and you’re
  responsible for the remaining 20% coinsurance.
• There is no hard annual “cap” on therapy, but very high total therapy costs can trigger extra medical review
  to confirm that services are still reasonable and necessary.

As long as your provider continues to document medical necessity and progress (or a need to prevent significant
decline), Part B can keep covering aquatic therapy sessions.

Medicare Advantage (Part C) plans

Medicare Advantage (Part C) plans are offered by private insurers but must cover at least what Original
Medicare (Parts A and B) covers. That means:

• If aquatic therapy would be covered under Original Medicare for your situation, a Medicare Advantage plan
  generally must cover it too.
• Your costs and rules (like copays, coinsurance, visit limits, and prior authorization) may be different than
  under Original Medicare.
• You’ll usually need to use in-network therapists and facilities and follow your plan’s preauthorization
  process.

Some Medicare Advantage plans also offer extra benefits, such as discounts on wellness or
fitness programs that use water exercise. Just remember: a water-exercise class that’s part of a wellness
program is different from covered aquatic therapy under a medical plan of care.

Medigap (Medicare Supplement) policies

If you have Original Medicare plus a Medigap policy:

• Medigap plans don’t decide whether aquatic therapy is coveredthat’s still Medicare’s job.
• What Medigap can do is help pay some or all of your Part B coinsurance and sometimes your
  Part B deductible, depending on the specific plan.
• If Medicare approves and pays for the aquatic therapy claim, your Medigap plan may pick up much of the
  remaining 20% share.

What conditions may qualify for covered aquatic therapy?

Aquatic therapy isn’t reserved for elite swimmers. It’s used for a wide range of conditions, especially when
land-based therapy is too painful, too unstable, or simply not safe. Examples include:

• Joint replacements: hip or knee replacement patients may move better in water because
  buoyancy takes pressure off new joints.
• Arthritis and chronic joint pain: warm water can ease stiffness and make gentle exercises
  more comfortable.
• Neurological conditions: such as stroke, multiple sclerosis, or Parkinson’s disease, where
  balance and strength training in water can reduce fall risk.
• Spine and back issues: including chronic low back pain or spinal surgery recovery.
• Balance and gait problems: water allows safer practice of walking and turning without the
  same risk of falling.

Your doctor and therapist will decide whether aquatic therapy is appropriate for your specific diagnosis and
goals. Medicare doesn’t usually list “aquatic therapy diagnoses” by name; instead, it focuses on whether the
service is reasonable, necessary, and properly documented for your condition.

What aquatic therapy does Medicare not cover?

Even if water exercise feels amazing, Medicare is pretty strict about what counts as covered therapy. In
general, Medicare does not cover:

• General fitness or wellness programs in a pool (for example, “silver splash” aerobics
  classes that aren’t tied to a treatment plan).
• Open pool time or memberships at gyms, community centers, or spas, even if you have a
  chronic condition.
• Group aquatic classes that are purely exercise-based and not billed as skilled therapy
  under a plan of care.
• Unsupervised home or community pool exercises you do on your own, even if your therapist
  suggested them as homework.

Medicare’s basic rule is that it pays for skilled therapy, not for activities aimed mainly at
general health, motivation, or recreation. If the service could be safely provided without a licensed therapist
or doesn’t address a specific functional impairment, it’s unlikely to be covered.

How much will aquatic therapy cost under Medicare?

Your actual out-of-pocket cost depends on the part of Medicare you have and whether you also carry Medigap or a
Medicare Advantage plan. In simple terms:

With Original Medicare only (Parts A and B)

• As an outpatient under Part B, you pay the annual Part B deductible first (this amount changes each year).
• After the deductible, you typically pay 20% of the Medicare-approved amount for each therapy
  session, including aquatic therapy.
• There’s no specific limit on the number of visits, but your care must remain medically necessary and
  documented.

For example, if Medicare approves $120 for an aquatic therapy visit, you might pay about $24 per session after
meeting your deductible. Actual allowed amounts vary by region and facility, so it’s smart to ask your
provider what they typically receive from Medicare for CPT 97113 or related therapy codes.

With Medicare + Medigap

If you have a Medigap plan, it may cover some or all of that 20% coinsurance and possibly the Part B
deductible, depending on the plan letter (for example, Plans G and N handle coinsurance differently). In that
case, your out-of-pocket costs per aquatic therapy visit can be much loweror sometimes close to zeroonce
coverage kicks in.

With Medicare Advantage

Medicare Advantage plans often use fixed copays for therapy, such as a flat dollar amount per
visit, or percentage-based coinsurance. Some plans set visit limits or require prior authorization once you
exceed a certain number of sessions. Always check:

• Whether aquatic therapy is considered “specialty” therapy under your plan.
• The exact copay or coinsurance per visit.
• Any preauthorization or referral requirements.

How to confirm that your aquatic therapy will be covered

To avoid surprises, treat aquatic therapy like you would any other medical service: verify, then verify again.
Here’s a simple checklist:

1. Talk to your doctor first. Ask whether aquatic therapy is medically necessary for your
   condition, and request a written order or referral that clearly states your diagnosis and goals.
2. Confirm that the provider accepts Medicare. Make sure both the facility and the therapist
   are able to bill Medicare and are in network if you have a Medicare Advantage plan.
3. Ask specifically: “Will you bill this as aquatic therapy under physical or occupational therapy?”
   You want to know which codes they’ll use and whether they’re experienced in Medicare billing for aquatic
   services.
4. Check for prior authorization. Many Medicare Advantage plans and some supplemental policies
   require approval before you start therapy or after a certain number of visits.
5. Request an estimate. Ask the provider’s billing office what your out-of-pocket cost is
   likely to be per visit with your specific plan.

Tips to avoid billing headaches

• Stick to the treatment plan. If your sessions gradually shift into “just exercising in the
  pool,” Medicare may deny further coverage.
• Monitor your visit count. If you’ve had a lot of therapy in a single year (land and water
  combined), ask whether your claims might face extra review and what documentation is being kept.
• Keep your own notes. Jot down your dates of service, how you felt, and what you worked on.
  If there’s ever a question about medical necessity, your notes can help you remember details when you talk to
  your provider.
• Review your Medicare Summary Notice (MSN) or Explanation of Benefits (EOB). Make sure
  aquatic therapy sessions are being billed correctly and that your coinsurance matches what you were told.

Safety and who should be cautious with aquatic therapy

Aquatic therapy is generally safe when supervised by a trained therapist, but it’s not right for everyone. You
may need extra screeningor an alternative approachif you have:

• Uncontrolled heart or lung disease.
• Open wounds, skin infections, or active contagious illness.
• Severe fear of water that cannot be managed with support.
• Unstable blood pressure or serious balance issues that make pool entry risky.

Your healthcare team will typically evaluate these risks before recommending aquatic therapy and may adjust
session length, intensity, or water depth to keep you safe.

Real-world experiences: what using Medicare for aquatic therapy is like

It’s one thing to read the rules and another to actually show up at the pool with a hospital bracelet tan line
on your wrist. Here are a few common real-world scenarios that illustrate how Medicare coverage for aquatic
therapy works in practice.

Mary’s story: Knee replacement and a smoother rehab

Mary, 72, had a total knee replacement. Land-based therapy was toughher knee felt stiff, her back hurt, and
she was nervous about falling when practicing her walking. Her orthopedic surgeon and physical therapist
suggested starting in the water. Mary’s therapist submitted a plan of care that clearly documented her
surgery, her mobility limitations, and why water would help her progress more safely.

Because Mary was covered under Original Medicare and the therapy clinic accepted Medicare assignment, her
aquatic sessions fell under Part B. After working through her deductible, she paid about 20% of the approved
amount per visit. She noticed:

• Less pain with bending and straightening her knee while supported by water.
• More confidence practicing stairs and steps in the pool before trying them at home.
• A smoother transition from water-based therapy back to land-based exercises.

After several weeks, Mary’s therapist documented measurable improvements in strength and range of motion, then
shifted her to a home exercise program. At that point, if Mary wanted to keep doing water exercise, she could
join a community classbut those ongoing classes would be out-of-pocket because they’re no longer skilled,
medically necessary therapy.

James’s experience: Parkinson’s disease and balance training

James, 78, has Parkinson’s disease and lives alone. Walking on uneven sidewalks makes him nervous. His
neurologist recommended physical therapy, and the PT suggested combining land and aquatic sessions. The
therapist’s documentation emphasized James’s high fall risk, his stiffness, and how buoyancy in the pool would
let him practice longer strides and balance in a safer environment.

James is enrolled in a Medicare Advantage plan. Before starting, the therapy office requested prior
authorization. The plan approved a certain number of visits, with the option to request more if he continued
to improve. James paid a fixed copay per sessionless than the 20% coinsurance he would have paid under
Original Medicare without Medigap, but he had to stay within the plan’s network and follow the authorization
rules closely.

After a few months, James felt more secure walking around his neighborhood and getting in and out of chairs.
When his gains leveled off, his therapist transitioned him to a community water-exercise class for maintenance
and social support. Those classes weren’t covered by Medicare, but they were affordable and helped him keep up
the progress he’d made.

Where people sometimes run into trouble

Not every aquatic therapy story is smooth sailing. Common pitfalls include:

• Starting without a clear prescription. If the program looks more like a fitness class than a
  medical treatment plan, Medicare may deny coverage.
• Switching facilities mid-stream. Moving from a Medicare-billing therapy clinic to a
  community pool can be great for your healthbut coverage rarely follows.
• Missing prior authorization. With Medicare Advantage, starting therapy before approval can
  mean paying the whole bill yourself.
• Lack of documentation. If progress notes don’t clearly show why therapy is still needed,
  future claims may be questioned or denied.

The takeaway from real-world experiences is simple: when aquatic therapy is clearly tied to a medical
diagnosis, documented as skilled care, and billed properly, Medicare often covers it. Most problems arise when
the service slides from “therapy” into “exercise class” on paper, even if it feels the same to you in the water.

Bottom line: Is aquatic therapy worth pursuing with Medicare?

If you’re dealing with pain, stiffness, weakness, or balance issues that make land-based therapy tough,
yes, aquatic therapy is worth asking about. For many people, the combination of buoyancy,
warmth, and controlled resistance makes it easier to move, practice, and build strength without flaring their
symptoms.

From a coverage standpoint, Medicare doesn’t have a special “pool benefit”it simply treats aquatic therapy as
another way to deliver medically necessary physical or occupational therapy. The keys to getting it covered are:

• A clear diagnosis and treatment goal.
• A written plan of care that specifies aquatic therapy.
• A Medicare-billing therapist and facility.
• Good documentation of your progress or ongoing medical need.

With those pieces in place, you can focus less on the paperwork and more on the healing power of waterone
carefully supervised step, stride, or gentle kick at a time.

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