Summary & Overview
CPT 97036: Hubbard Tank Hydrotherapy, Physical Medicine Modality
CPT code 97036 represents the application of a Hubbard Tank modality, a specialized hydrotherapy treatment used in physical medicine and rehabilitation. This procedure is performed in outpatient physical therapy settings and is designed to address a range of musculoskeletal and pain-related conditions, such as low back pain, knee pain, fibromyalgia, and muscle weakness. The code is recognized by major national payers, including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare, making it relevant for providers and billing professionals across the United States.
This publication provides a comprehensive overview of 97036, including payer coverage, clinical indications, and related billing codes. Readers will gain insight into the clinical context for Hubbard Tank therapy, typical diagnoses associated with its use, and how it fits within the broader landscape of physical medicine modalities. The analysis also highlights common modifiers and associated taxonomies, offering clarity on documentation and coding practices. Additionally, comparisons to related CPT codes such as 97010, 97110, 97112, and 97113 are included to help distinguish the unique aspects of Hubbard Tank therapy. Policy updates and reimbursement benchmarks are discussed to inform stakeholders about current trends and requirements in medical billing for this service.
CPT Code Overview
CPT code 97036 is used to report the application of a modality to one or more areas using a Hubbard Tank, with each session lasting 15 minutes. This code falls under the category of Physical Medicine and Rehabilitation Modalities, which are designed to assist patients in improving mobility, reducing pain, and enhancing physical function. The typical site of service for this procedure is Outpatient Physical Therapy (Place of Service 11), where patients receive specialized therapeutic interventions in a clinical setting.
Clinical & Coding Specifications
Clinical Context
A patient presents to outpatient physical therapy with chronic low back pain and generalized muscle weakness. The physical therapist evaluates the patient and determines that hydrotherapy in a Hubbard Tank is appropriate to help manage pain and improve mobility. The patient is assisted into the Hubbard Tank, and the modality is applied for 15 minutes. This service is typically performed in an outpatient setting, such as a physical therapy clinic, and is supervised by a licensed physical therapist. The procedure is documented and coded as 97036 for each 15-minute session.
Coding Specifications
- Modifier
GP: Indicates that the service is part of a physical therapy plan of care. Used when the procedure is performed by a physical therapist or under their supervision.
| Modifier Code | Description |
|---|---|
GP | Physical therapy services modifier |
- Provider Taxonomies:
| Taxonomy Code | Specialty |
|---|---|
225100000X | Physical Therapist |
- Modifier
GPis required for claims submitted to payors such as Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare when the service is provided as part of a physical therapy plan.
Related Diagnoses
-
M54.5- Low back pain- Relevant for patients receiving hydrotherapy to manage chronic or acute back pain.
-
M25.561- Pain in right knee- Indicates knee pain that may benefit from hydrotherapy for pain relief and improved mobility.
-
M25.562- Pain in left knee- Similar to above, for left knee pain addressed with hydrotherapy.
-
M79.7- Fibromyalgia- Hydrotherapy can help manage widespread pain and stiffness associated with fibromyalgia.
-
M62.81- Muscle weakness (generalized)- Hydrotherapy is used to assist patients with generalized muscle weakness in regaining strength and function.
Related CPT Codes
-
97010- Hot or cold packs (note: not separately reimbursable when used alone)- May be used as adjunctive therapy before or after hydrotherapy, but cannot be billed separately if used alone.
-
97110- Therapeutic procedure, therapeutic exercises, each 15 minutes- Often performed in conjunction with hydrotherapy to improve strength and mobility.
-
97112- Neuromuscular reeducation, each 15 minutes- May follow hydrotherapy to enhance neuromuscular control and function.
-
97113- Aquatic therapy with therapeutic exercises, each 15 minutes- Alternative to
97036when therapeutic exercises are performed in water, rather than just modality application.
- Alternative to
These codes are commonly used together in a physical therapy plan, depending on the patient's needs and response to treatment. 97036 is specific to Hubbard Tank hydrotherapy, while 97113 covers aquatic therapy with exercises.
National Reimbursement Benchmarks
National mean rates for CPT code 97036 show that Blue Cross Blue Shield, Cigna, UnitedHealth Group, and BUCA (average commercial) all reimburse at higher levels than Medicare. The BUCA mean rate is $37.71, while Medicare's mean rate is $36.13, indicating that commercial payers generally offer slightly higher reimbursement than Medicare for this code.
Rate dispersion varies significantly across payers. Cigna has the widest spread, with a difference of $29.00 between its 75th and 25th percentiles, suggesting greater variability in contracted rates. In contrast, Aetna and Medicare have the tightest ranges, at $10.00 and $4.00 respectively, reflecting more consistent reimbursement levels. The table and chart below present the full breakdown of national benchmarks by payer.
State Benchmarks
State: AK1 / 50
Alaska Benchmarks
Alaska exhibits a wide spread in reimbursement rates for CPT code 97036, with the largest rate spread observed in Cigna, where the difference between the 75th and 25th percentiles is $46.39. UnitedHealth Group also shows a narrow spread, with rates tightly clustered between $88.00 and $89.00. Compared to national averages, all commercial payers in Alaska offer substantially higher mean rates, with UnitedHealth Group and Blue Cross Blue Shield standing out for their elevated reimbursement levels.
The table and chart below present the full breakdown of payer-specific rates, including mean, 25th, 50th, and 75th percentiles, highlighting the variation across payers in Alaska.
Key Insights for Alaska
- UnitedHealth Group is the highest paying payer in Alaska for CPT 97036, with a mean rate of $84.51.
- Medicare is the lowest paying payer, with a mean rate of $34.91.
- All commercial payers in Alaska reimburse at rates significantly above their respective national averages, with UnitedHealth Group and Blue Cross Blue Shield showing the largest deviations.
Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.