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CPT 97036: Hubbard Tank Hydrotherapy

CPT code 97036 represents hydrotherapy delivered using a Hubbard tank — an immersion-based water therapy modality used in physical rehabilitation for pain relief, mobility support, and therapeutic exercise. Nationally, this code matters because it captures a distinct, equipment-dependent therapy that requires specialized facilities and oversight, influencing coding, billing, and access to aquatic rehabilitation services. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will learn the clinical context for CPT code 97036, how it is typically used in outpatient rehabilitation and physical therapy settings, and how it relates to other therapeutic procedures such as therapeutic exercises and aquatic therapy. The publication provides benchmark information, coding considerations, and policy-relevant details that affect coverage and site-of-service delivery for hydrotherapy in a Hubbard tank. The summary outlines common diagnoses associated with this service and highlights operational features relevant to providers and payers, such as equipment requirements and supervised delivery in a clinical setting.

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Billing Code Overview

CPT code 97036 describes hydrotherapy delivered in a Hubbard tank, a form of water-based therapeutic treatment that uses immersion to provide resistance, support, and thermal effects for rehabilitation. The service type is hydrotherapy via Hubbard tank, focused on therapeutic water immersion techniques. The typical site of service for this procedure is an outpatient rehabilitation facility, physical therapy clinic, or other therapeutic setting equipped with a Hubbard tank for supervised aquatic treatment.

National Reimbursement Benchmarks

Commercial averages sit well above Medicare for CPT 97036: Blue Cross Blue Shield, Cigna, UnitedHealth Group, Aetna and BUCA all have mean rates materially higher than Medicare’s mean of $36.1, with BUCA’s mean at $49.1 representing a modest premium over Medicare and several national payers showing even larger gaps. This positions Medicare near the lower end of national means while commercial payers cluster higher, creating a clear separation between fee-for-service baseline reimbursement and commercial contracting levels.

Dispersion varies notably by payer. Blue Cross Blue Shield and Cigna show the widest interquartile spreads at $26.0 (BCBS: $65.0−$40.9) and $43.4 (Cigna: $81.2−$35.8), indicating greater variability in contractual rates, while Aetna and UnitedHealth Group are among the tightest with ranges of $7.9 (Aetna: $29.0−$21.0) and $11.5 (UnitedHealth Group: $44.2−$30.7), respectively. BUCA’s IQR is $23.3 ( $59.2−$35.9 ), placing it in the mid-range for dispersion relative to other payers.

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CPT 97036: Hubbard Tank Hydrotherapy

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Billing Code Overview

National Reimbursement Benchmarks

National Payer Mean Reimbursement Rates

Clinical & Coding Specifications

Clinical Context

A 56-year-old patient with chronic low back pain (M54.5) and generalized muscle weakness (M62.81) is referred by a physician to outpatient physical therapy for hydrotherapy in a Hubbard tank to reduce pain, improve range of motion, and facilitate strengthening. The typical workflow begins with an initial evaluation by a physical therapist (taxonomy 225100000X) who documents baseline pain, functional limitations, contraindications to immersion (e.g., uncontrolled cardiac conditions, open wounds), and goals. The patient is scheduled for supervised hydrotherapy sessions using the Hubbard tank 97036, each session staffed by a licensed physical therapist or qualified therapy assistant under supervision. During the visit the therapist verifies vitals, reviews contraindications, assists the patient into the tank, supervises therapeutic immersion interventions (pain modulation, gentle mobilization, and graduated resistance activities), documents time and objectives, and records any adverse events. Progress is re-evaluated periodically and other modalities or therapeutic exercises are billed separately as appropriate.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional component of a pooled hydrotherapy service if applicable under payer rules.
`52`	Reduced services	Use when the full hydrotherapy service was partially rendered due to patient tolerance or shortened session.
`53`	Discontinued procedure	Use when the Hubbard tank treatment is started but discontinued due to patient emergency or intolerance.
`59`	Distinct procedural service	Use when hydrotherapy is distinct from other services performed on the same day and payer requires a modifier to indicate distinct service.
`62`	Two surgeons (or co-signed services)	Rarely used; apply if two qualified providers of record both deliver distinct portions of care per payer policy.
`78`	Return to operating room for related procedure	Not typical; include only if a post-procedural return related to the hydrotherapy intervention occurs and payer requires it.
`80`	Assistant at surgery	Not typically applicable; include only if an assistant providing direct support is billable under payer rules.
`82`	Assistant (when a qualified resident is not available)	Apply if applicable per payer when a billable assistant is involved in delivering the service.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for Medicare	Use when an eligible advanced practice clinician provides the service under Medicare rules.
`GP`	Service delivered under an outpatient physical therapy plan of care	Use when the service is part of a physical therapist’s outpatient plan and payer recognizes `GP`.
`QX`	CRNA service with medical direction by physician	Use only if a CRNA is involved and payer requires the modifier (rare for hydrotherapy).
`QY`	Anesthesiologist-directed nurse anesthetist service	Rarely applicable; include only under specific payer requirements.
`59`	Distinct procedural service	Duplicate entry avoided; see first `59` row for guidance.

Taxonomy Code	Specialty	Notes
`225100000X`	Physical Therapist	Primary provider performing and documenting Hubbard tank hydrotherapy; documents plan of care and progress.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M54.5`	Low back pain	Hydrotherapy in a Hubbard tank can reduce axial loading, decrease pain, and facilitate trunk mobility and strengthening.
`M25.561`	Pain in right knee	Immersion therapy can reduce joint loading and enable progressive knee range-of-motion and strengthening activities.
`M25.562`	Pain in left knee	Same clinical rationale as right knee pain; useful for bilateral knee rehabilitation.
`M79.7`	Fibromyalgia	Warm water immersion may reduce widespread musculoskeletal pain and improve tolerance for exercise in fibromyalgia patients.
`M62.81`	Muscle weakness (generalized)	Buoyancy in a Hubbard tank supports weakened muscles, allowing graded strengthening and functional retraining.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97010`	Hot or cold packs (note: not separately reimbursable when used alone)	Common adjunctive modality applied before or after hydrotherapy to manage pain or swelling; may be bundled by some payers.
`97110`	Therapeutic procedure, therapeutic exercises, each 15 minutes	Exercises performed on land or in water may be billed in addition to `97036` when distinct active therapeutic exercise time is documented.
`97112`	Neuromuscular reeducation, each 15 minutes	Used when functional motor control or balance activities are performed in conjunction with or following the hydrotherapy session.
`97113`	Aquatic therapy with therapeutic exercises, each 15 minutes	Distinct from Hubbard tank hydrotherapy; use when active therapeutic exercises are performed in an aquatic environment and documented as separate timed services.

CPT 97032: Electrical Stimulation Therapy for Muscle Pain and Dysfunction

CPT-97033-IONTOPHORESIS-TRANSDERMAL-MEDICATION-DELIVERY

CPT 97033: Iontophoresis for Transdermal Medication Delivery

CPT-97034-CONTRAST-BATH-THERAPY

CPT 97034: Contrast Bath Therapy for Pain and Swelling

CPT-97035-THERAPEUTIC-ULTRASOUND-TISSUE-HEALING-PAIN-RELIEF

CPT 97035: Therapeutic Ultrasound for Soft-Tissue Healing

CPT-97037-POSTOPERATIVE-THERAPEUTIC-LASER-PAIN-REDUCTION

CPT 97037: Postoperative Therapeutic Laser for Pain Reduction

CPT-97039-UNLISTED-PHYSICAL-THERAPY-MODALITY

CPT 97039: Unlisted Physical Therapy Modality

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional component of a pooled hydrotherapy service if applicable under payer rules.
`52`	Reduced services	Use when the full hydrotherapy service was partially rendered due to patient tolerance or shortened session.
`53`	Discontinued procedure	Use when the Hubbard tank treatment is started but discontinued due to patient emergency or intolerance.
`59`	Distinct procedural service	Use when hydrotherapy is distinct from other services performed on the same day and payer requires a modifier to indicate distinct service.
`62`	Two surgeons (or co-signed services)	Rarely used; apply if two qualified providers of record both deliver distinct portions of care per payer policy.
`78`	Return to operating room for related procedure	Not typical; include only if a post-procedural return related to the hydrotherapy intervention occurs and payer requires it.
`80`	Assistant at surgery	Not typically applicable; include only if an assistant providing direct support is billable under payer rules.
`82`	Assistant (when a qualified resident is not available)	Apply if applicable per payer when a billable assistant is involved in delivering the service.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for Medicare	Use when an eligible advanced practice clinician provides the service under Medicare rules.
`GP`	Service delivered under an outpatient physical therapy plan of care	Use when the service is part of a physical therapist’s outpatient plan and payer recognizes `GP`.
`QX`	CRNA service with medical direction by physician	Use only if a CRNA is involved and payer requires the modifier (rare for hydrotherapy).
`QY`	Anesthesiologist-directed nurse anesthetist service	Rarely applicable; include only under specific payer requirements.
`59`	Distinct procedural service	Duplicate entry avoided; see first `59` row for guidance.

Taxonomy Code	Specialty	Notes
`225100000X`	Physical Therapist	Primary provider performing and documenting Hubbard tank hydrotherapy; documents plan of care and progress.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M54.5`	Low back pain	Hydrotherapy in a Hubbard tank can reduce axial loading, decrease pain, and facilitate trunk mobility and strengthening.
`M25.561`	Pain in right knee	Immersion therapy can reduce joint loading and enable progressive knee range-of-motion and strengthening activities.
`M25.562`	Pain in left knee	Same clinical rationale as right knee pain; useful for bilateral knee rehabilitation.
`M79.7`	Fibromyalgia	Warm water immersion may reduce widespread musculoskeletal pain and improve tolerance for exercise in fibromyalgia patients.
`M62.81`	Muscle weakness (generalized)	Buoyancy in a Hubbard tank supports weakened muscles, allowing graded strengthening and functional retraining.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97010`	Hot or cold packs (note: not separately reimbursable when used alone)	Common adjunctive modality applied before or after hydrotherapy to manage pain or swelling; may be bundled by some payers.
`97110`	Therapeutic procedure, therapeutic exercises, each 15 minutes	Exercises performed on land or in water may be billed in addition to `97036` when distinct active therapeutic exercise time is documented.
`97112`	Neuromuscular reeducation, each 15 minutes	Used when functional motor control or balance activities are performed in conjunction with or following the hydrotherapy session.
`97113`	Aquatic therapy with therapeutic exercises, each 15 minutes	Distinct from Hubbard tank hydrotherapy; use when active therapeutic exercises are performed in an aquatic environment and documented as separate timed services.

CPT 97032: Electrical Stimulation Therapy for Muscle Pain and Dysfunction

CPT-97033-IONTOPHORESIS-TRANSDERMAL-MEDICATION-DELIVERY

CPT 97033: Iontophoresis for Transdermal Medication Delivery

CPT-97034-CONTRAST-BATH-THERAPY

CPT 97034: Contrast Bath Therapy for Pain and Swelling

CPT-97035-THERAPEUTIC-ULTRASOUND-TISSUE-HEALING-PAIN-RELIEF

CPT 97035: Therapeutic Ultrasound for Soft-Tissue Healing

CPT-97037-POSTOPERATIVE-THERAPEUTIC-LASER-PAIN-REDUCTION

CPT 97037: Postoperative Therapeutic Laser for Pain Reduction

CPT-97039-UNLISTED-PHYSICAL-THERAPY-MODALITY

CPT 97039: Unlisted Physical Therapy Modality

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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CPT 97036: Hubbard Tank Hydrotherapy

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Billing Code Overview

National Reimbursement Benchmarks

OpenPayer

CPT 97036: Hubbard Tank Hydrotherapy

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Billing Code Overview

National Reimbursement Benchmarks

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

CPT 97036: Hubbard Tank Hydrotherapy

Sign up for cpt 97036 policy alerts

Billing Code Overview

National Reimbursement Benchmarks

CPT 97036: Hubbard Tank Hydrotherapy

Sign up for cpt 97036 policy alerts

Billing Code Overview

National Reimbursement Benchmarks

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What does CPT 97036 represent and where is it typically provided?

Which diagnoses or clinical scenarios are appropriate to document with 97036?

Which modifiers are listed as relevant for billing CPT 97036?

How do reimbursement rates for 97036 compare across payers and to Medicare?

Can 97036 be billed with other therapy codes like 97110 or 97113, and what about adjuncts like hot/cold packs?

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What does CPT 97036 represent and where is it typically provided?

Which diagnoses or clinical scenarios are appropriate to document with 97036?

Which modifiers are listed as relevant for billing CPT 97036?

How do reimbursement rates for 97036 compare across payers and to Medicare?

Can 97036 be billed with other therapy codes like 97110 or 97113, and what about adjuncts like hot/cold packs?

References