Most health insurance plans do cover aquatic therapy, but only when it is prescribed as medically necessary physical therapy and delivered one-on-one by a licensed therapist for a qualifying condition. Group water aerobics, lap swimming, and general pool conditioning are not covered by any major insurer. The practical question for most patients is not whether their plan covers aquatic therapy in principle, but whether their specific diagnosis, provider setup, and documentation will meet the plan’s rules.
The Conditions Every Insurer Imposes
Aquatic therapy is billed under CPT code 97113, defined as a “therapeutic procedure, one or more areas, each 15 minutes; aquatic therapy with therapeutic exercises.”1Aquatic Therapy University. What Is Aquatic Therapy and Who Can Bill for Aquatic Therapy The code requires direct, skilled, one-on-one contact between the therapist and the patient. It cannot be used for group sessions, recreational swimming, or general fitness activities in a pool.
That distinction drives coverage. Across private insurers, Medicare, Medicaid, and TRICARE, four requirements come up again and again:
- A physician’s order or referral establishing medical necessity.
- Treatment delivered one-on-one by a licensed physical therapist (or in some plans, a physician or physical therapy assistant).
- A qualifying diagnosis, usually musculoskeletal or rehabilitative in nature.
- A goal of restoring lost function, not simply maintaining the patient’s current state.
Aquatic exercise classes, “learn to swim” programs, and separate pool access fees are excluded across the board.2HydroWorx. Aquatic Therapy Guide
How Private Insurance Plans Differ
Private insurers treat aquatic therapy as a physical therapy modality, so it falls under your plan’s physical therapy benefit and is subject to the same visit limits, copays, and deductibles. On top of that, each insurer layers its own medical necessity rules.
Aetna
Aetna considers aquatic therapy medically necessary only for musculoskeletal conditions where the goal is restoring function lost to injury or illness. The therapy must involve direct one-on-one contact with a licensed provider. Maintenance therapy, where a patient is neither improving nor declining, is not covered. Aetna considers aquatic therapy for conditions like asthma, autism, COPD, lymphedema, and dementia experimental and unproven.3Aetna. Pool Therapy, Aquatic Therapy or Hydrotherapy
Blue Cross Blue Shield
BCBS policies vary by state affiliate. BCBS of Texas considers aquatic therapy medically necessary when administered one-to-one by a licensed provider and expects a durable corrective benefit within four to six months.4BCBS of Texas. Rehabilitative Therapy Services BCBS of North Carolina covers aquatic therapy under its physical therapy benefit with the same one-on-one requirement and explicitly excludes group aquatic therapy and “dry hydrotherapy” devices.5Blue Cross NC. Rehabilitative Therapies In both cases, the member’s individual benefit plan governs if there is a conflict with the general policy.
UnitedHealthcare
UnitedHealthcare covers aquatic therapy as part of an authorized physical therapy treatment plan when a licensed physical therapist is in attendance. Coverage specifics, including any prior authorization requirements, depend on the member’s individual Evidence of Coverage or Schedule of Benefits.6UnitedHealthcare. Rehabilitation Services
Cigna
Cigna distinguishes general aquatic exercise programs from skilled aquatic therapy. General fitness, strength, flexibility, or conditioning programs are categorized as services that do not require a physical therapist’s skills and are not medically necessary. CPT 97113 is only covered when the service meets full rehabilitative or habilitative physical therapy criteria, meaning the patient’s condition is complex enough that it cannot be safely managed through a home exercise program.7Cigna. Physical Therapy Coverage Policy
Kaiser Permanente
Kaiser Permanente Mid-Atlantic States applies one of the most restrictive policies. Aquatic therapy is medically necessary only for ankylosing spondylitis, fibromyalgia, knee or hip osteoarthritis, and rheumatoid arthritis. The patient must also show a recent change in clinical status, such as a new diagnosis, recent surgery, hospitalization, or functional decline. A land-based physical therapy evaluation must first determine whether the patient can participate in dry-land exercises; aquatic therapy is positioned as a bridge, not a long-term treatment. Chronic low back pain, Parkinson’s disease, stroke, and total knee arthroplasty are specifically listed as non-covered indications.8Kaiser Permanente. Aquatic Therapy Medical Coverage Policy
Medicare Coverage
Medicare Part B covers outpatient physical therapy, including aquatic therapy, when a physician or other authorized provider certifies it as medically necessary. After the Part B deductible ($283 in 2026), Medicare pays 80% of the approved amount and the patient pays 20%.9Medicare Interactive. Outpatient Therapy Costs There is no annual cap on medically necessary therapy, but once combined spending on physical therapy and speech-language pathology hits $2,480 in 2026, the provider must affirm and document that continued care is medically necessary.
If aquatic therapy is provided during an inpatient hospital stay, Medicare Part A may cover it at 100% after the Part A deductible is met.10Medicare.org. Does Medicare Cover Aquatic Therapy
Qualifying conditions can vary by region because Medicare Administrative Contractors issue Local Coverage Determinations. First Coast Service Options, which covers parts of the Southeast, considers aquatic therapy medically necessary for patients with rheumatoid arthritis, paraparesis or hemiparesis, recent amputation, recovery from a paralytic condition, post-cast limb mobilization, post-head-trauma limb mobilization, or an inability to tolerate gravity-based weight bearing.11Liles Parker. Enforcement Targeting Aquatic Therapy Providers and CPT Code 97113 Claims Other contractors maintain different lists, so the qualifying diagnoses can depend on where you live.
Medicare Advantage (Part C) plans may also cover aquatic therapy, but coverage, premiums, and cost-sharing vary by plan. Check the plan documents or call the plan directly.12Healthline. Does Medicare Cover Aquatic Therapy
Medicaid Coverage
Medicaid coverage is set at the state level, and policies vary widely. There is no federal mandate requiring it. Some states include CPT 97113 on their therapy fee schedules; others exclude it. Michigan Medicaid, for example, does not cover aquatic therapy as a separately billable modality, though a therapeutic procedure performed in a pool may be reimbursed if billed under a different covered procedure code and meets all other requirements.13Michigan Department of Community Health. MSA Bulletin 05-36 Florida’s Medicaid program includes CPT 97113 on its therapy fee schedule.1Aquatic Therapy University. What Is Aquatic Therapy and Who Can Bill for Aquatic Therapy Managed-care Medicaid plans set their own medical necessity criteria, so verify coverage directly with your plan.
TRICARE
TRICARE covers aquatic therapy when it is medically necessary, prescribed by a physician (or certified physician assistant or nurse practitioner), and provided as part of physical therapy or occupational therapy. Exercise classes conducted in a swimming pool are explicitly excluded.14TRICARE. Aquatic Therapy
Documentation That Makes a Claim Stick
The paperwork burden sits with the provider, but patients benefit from knowing what belongs in the file. A claim is far more likely to be approved when it includes:
- A signed physician referral or order dated before therapy begins.
- An initial physical therapy evaluation documenting functional limitations in measurable terms, such as range of motion, strength grades, and levels of assistance needed.
- Written justification for the water environment, meaning either that the patient cannot safely participate in land-based therapy or that the physical properties of water are clinically necessary for the treatment goals.
- A written plan of care with specific goals, frequency and duration of treatment, and expected outcomes with timeframes.
- Progress notes showing measurable improvement toward those goals. Some Medicare contractors require updated supporting documentation at least every ten visits.11Liles Parker. Enforcement Targeting Aquatic Therapy Providers and CPT Code 97113 Claims
For continued sessions beyond the initial authorization, most insurers want documented functional progress, evidence that the patient is following a home exercise program, and a realistic expectation that further improvement is achievable within a predictable timeframe.
Why Claims Get Denied
A few patterns show up over and over in denied aquatic therapy claims:
- Lack of medical necessity. The insurer decides land-based therapy would be sufficient, or the diagnosis is not on the plan’s covered list.
- Maintenance classification. Once a patient plateaus and stops making measurable gains, insurers stop covering sessions because the therapy has shifted from rehabilitation to maintenance.15Aetna. Physical Therapy
- Missing prior authorization. Some plans require pre-approval; treatment that begins without it can be denied after the fact.
- Documentation gaps. Thin treatment plans, missing progress notes, or no explanation of why the water environment is clinically necessary.
- Non-covered condition. Chronic low back pain, developmental disabilities, and certain neurological conditions are explicitly excluded by some plans.
- Billing errors. Coding mistakes, billing group sessions under 97113, or billing for time spent changing clothes or entering the pool rather than skilled therapy time.
How to Appeal a Denial
Many denied claims are overturned on appeal, but few patients file one. The process has two main stages.
Start with an internal appeal to the insurer. Under federal rules, you generally have 180 days from the denial notice to submit a written appeal. Include the denial letter, claim number, insurance ID, a letter of medical necessity from the prescribing physician, and detailed progress notes from the therapist that distinguish the treatment from routine maintenance. Insurers must decide within 30 days for services not yet received and 60 days for services already provided.16Centers for Medicare & Medicaid Services. Appeals
If the internal appeal is denied, you have the right to an external review by an independent third party. The request must usually be filed within 60 days of the final internal denial, and the reviewer’s decision is generally binding on the insurer. For urgent cases where delay could jeopardize your health, an expedited review must be completed within four business days, and internal and external reviews can proceed at the same time.
If both appeals fail, file a complaint with your state’s insurance commissioner. For employer-sponsored coverage, you can also escalate through your employer’s human resources department.