A medical device manufacturer sells a range of electrotherapy and rehabilitation products (TENS units, muscle stimulators, incontinence devices, iontophoresis systems, dynamic splints, cervical traction units, knee rehab devices, and related accessories) both to health care providers and directly to patients on prescription. How does Texas sales tax treat each product, and does it matter who buys it?

Plain-English summary

A Minnesota-based medical device manufacturer, registered to collect Texas sales/use tax, asked the Comptroller to rule product-by-product on the taxability of its electrotherapy and rehabilitation equipment line. Sales to patients require a doctor's prescription; sales to clinics or health professionals may be for the provider's own use in treatment or resold to patients on prescription. The Comptroller answered each product:

• TENS (Transcutaneous Electrical Nerve Stimulation) — a wearable pulse generator that reduces chronic/acute pain via electrical stimulation. Taxable when sold to health care providers for their own use; exempt when sold to an individual with a doctor's prescription.
• NMES (Neuromuscular Electrical Stimulation) — activates muscles for rehabilitation, producing involuntary contractions to maintain strength/mobility. Same rule: taxable to providers, exempt to prescription patients.
• Surface Electromyography (sEMG) systems — diagnostic biofeedback for muscle re-education, used clinically or via a portable home unit. Taxable to providers, exempt to prescription patients.
• Innova (female urinary incontinence device) — an internally worn electrode driven by an external stimulator to treat incontinence. Taxable to providers, exempt to prescription patients.
• Dupel (iontophoresis systems) — uses electrical current to deliver medication through the skin; used exclusively in a clinical setting and administered by a physician. This device is not prescription-based, but is still taxable when sold to health care providers (no patient-prescription exemption path is described, since it's clinician-administered only).
• Advance (dynamic splints) — a splint the health professional prescribes and customizes for the patient. Exempt as a brace, with NO prescription required.
• Pronex (cervical traction systems) — a wearable pump device that stretches the neck to relieve cervical pain. Taxable to providers, exempt to prescription patients (same pattern as TENS/NMES).
• Protonics (functional active resistance knee device) — a wearable exercise/rehab system for the knee. The answer here depends on design: if it's designed to provide rigidity or support, it's an exempt brace (no prescription needed); if it's designed to correct or rehabilitate, it's taxable to providers and exempt to prescription patients.
• Accessories (electrodes, batteries, conductive gels, skin-care products) — taxability follows the taxability of the device they're designed to be used with.

What this means for you

Medical device manufacturers and distributors

The recurring pattern across most of this product line is: taxable when sold to a health care provider for use in their own practice, exempt when sold directly to an individual patient with a doctor's prescription. But watch for exceptions — a device classified as a "brace" (like the dynamic splint) is exempt outright with no prescription needed, while a clinician-only device with no patient-prescription pathway (like the iontophoresis system) stays taxable regardless of the buyer. Accessories simply inherit whatever tax status applies to their parent device.

Physical therapy clinics, doctors' offices, and other health care providers buying this equipment

Expect to pay tax on devices you purchase for use in treating patients in your office — the "provider use" category is taxable across nearly every product in this letter, with the notable exception of brace-classified devices.

Accountants and tax professionals

This letter is a useful multi-product template for the recurring Texas medical-device pattern: prosthetic-device/brace exemptions apply with no prescription, while broader "therapeutic device" exemptions require a doctor's prescription and only extend to sales made directly to the patient — not to a provider's own equipment purchases. The Protonics analysis (design-dependent classification) is a good example of how borderline devices get sorted between the two categories.

Common questions

Q: Is a TENS unit taxable in Texas?
A: Taxable when sold to a health care provider for use in their practice; exempt when sold to an individual patient with a doctor's prescription.

Q: Are dynamic splints (braces) exempt without a prescription?
A: Yes — this letter classifies the Advance dynamic splint as an exempt brace, no prescription required.

Q: Is the iontophoresis system (Dupel) ever exempt?
A: Not per this letter — since it's used exclusively in a clinical setting and administered by a physician (not sold directly to patients on prescription), it's taxable when sold to health care providers.

Q: How is a device's accessory (electrodes, batteries, gels) taxed?
A: The accessory follows the taxability of the device it's designed to be used with.

Citations and references

No specific statute or rule section was cited in the available text of this letter.

Source

• STAR search: https://star.comptroller.texas.gov/search?doc_type_code=L&tax_type_code=SST
• Opinion: https://star.comptroller.texas.gov/view/200006433L

Original ruling text

June 30, 2000

Dear **:

Thank you for your recent letter concerning the taxability of the medical
products described below. My response follows each product described.

COMPANY A is a Minnesota domiciled manufacturer and distributor of medical
devices and related accessories. COMPANY A is registered as a foreign
corporation in your state and is currently registered with your department to
collect and remit sales/use tax.

COMPANY A's sales/rentals to patients must be accompanied by a doctor's written
prescription. Some sales are made to clinics, doctors, or other health
professionals for which the products either are used in their office/clinic
setting in the course of rendering a service or are resold to patients on
prescription. Please note that the medical devices can be rented, rented and
converted to sale, or sold to the patients, but when transacting with
professional organizations, the devices must be sold. The description of each
medical device listed below includes its appropriate billing code designated by
HCFA (Health Care Financing Administration), commonly known as its HCPC (HCFA
Common Procedure Code).

The medical devices sold by COMPANY A include:

TENS (Transcutaneous Electrical Nerve Stimulation)
A TENS device is used to treat chronic and acute pain with electrical
stimulation. A TENS device consists of a small, portable, battery-powered pulse
generator that is connected via wires to electrodes and placed on the skin at
or near the site of the patient's pain. A TENS device generally reduces pain
while the device is being used, as well as for a period of time following
usage, but does not cure the cause of the pain. TENS devices are designed to be
worn on the person of the user. Accessories include electrodes, leadwires,
batteries, skin prep, conductive gels, etc. TENS is billed using the HCPC E0730
for both rentals and purchases. Response: Taxable when sold to health care
providers for their use. Exempt when sold to an individual with a doctor's
prescription.

NMES (Neuromuscular Electrical Stimulation)
An NMES device is used to activate muscles for muscle rehabilitation purposes.
The NMES device produces controlled, involuntary muscle contractions, aiding in
maintaining the strength and mobility of a limb or preventing deterioration of
muscle tissues in patients who are unable to perform voluntary muscle
contractions. Like TENS, NMES devices are small, portable, battery powered
pulse generators designed to be worn on the person of the user. Accessories are
similar to the TENS accessories. Response: Taxable when sold to health care
providers for their use. Exempt when sold to an individual with a doctor's
prescription.

Surface Electromyography Systems (sEMG)
The sEMG system provides diagnostic biofeedback through auditory and visual
display to aid in muscle re-education and rehabilitation. The clinical system
would be utilized in the office of a doctor, physical therapist, or other
health professional, while a portable device is available to the patients for
use in their home. Response: Taxable when sold to health care providers for
their use. Exempt when sold to an individual with a doctor's prescription.

Innova (Female Urinary Incontinence Products)
Innova is used by a patient for in-home treatment of incontinence. Innova is
composed of an externally worn, microprocessor-based electrical neuromuscular
stimulator that activates a tampon-like vaginal electrode worn internally.
Innova is an electro-therapeutic device that causes involuntary contractions of
the pelvic musculature and urinary sphincter in order to treat or cure
incontinence. Response: Taxable when sold to health care providers for their
use. Exempt when sold to an individual with a doctor's prescription.

Dupel (Iontophoresis Systems)
Iontophoresis is a process that uses electrical current to assist drug transfer
through the skin. Iontophoretic applications include the delivery of local
anesthesia and anti-inflammatory medication for tissue management. The
iontophoresis system includes a device transmitter and a buffered electrode.
Currently, the iontophoresis system is used exclusively in the office of a
health care professional, but is designed to be worn on the person of the user.
Accessories include lead wires, batteries, electrodes, etc. This device is not
prescription based, but must be used in the clinical setting and administered
by a physician. Response: Taxable when sold to health care providers.

Advance (Dynamic Splints)
The dynamic splint is used to treat range of motion problems that can occur
following injuries and certain surgeries. The splint is worn on the patient.
The health professional prescribes the splint for the patient and makes certain
modifications to the splint for specific use by the particular patient.
Response: Exempt as a brace. A prescription is not required.

Pronex (Cervical Traction Systems)
This unit, worn on the person of the user, is designed to apply upward pressure
to the patients head by pumping the rubber bulb pump. This pressure lifts the
head, applying a stretch to the neck, which aids in relieving chronic cervical
pain and tension. Response: Taxable when sold to health care providers. Exempt
when sold to an individual with a doctor's prescription.

Protonics (Functional Active Resistance)
A Protonics device applies functional active resistance knee rehabilitation,
serving as an exercise system to increase muscle strength and neuromuscular
function. The device is worn on the user, allowing him/her to exercise and
perform daily activities. The device eliminates the need for taping or soft
bracing of the knee, providing a controlled resistance to the hamstring.
Related accessories include replacement pads, straps, extension kits, and
flexion kits. Response: A brochure on this product was not included. If the
product is designed to provide rigidity or support, it qualifies for exemption
as a brace and a prescription is not required. However, if it is designed to
correct or rehabilitate, it is taxable when sold to health care providers and
exempt when sold to an individual with a doctor's prescription.

Accessories
Related accessories include electrodes, batteries, conductive gels, and skin
care products. None of the accessories may be used without the use of the
device. Except for the Innova electrode, none of the electrodes are reusable.
(i.e., skin care products are only used to help in the electrode application,
removal, or related irritation) Response: Taxability follows the taxability of
the product the accessories are designed to be used with.

The State Tax Automated Research (STAR) system, which provides viewing and
downloading of our rules, the Tax code, edited letter rulings, hearings,
Attorney General Opinions, etc., may be accessed on the Internet at:
http://www.window.state.tx.us/

This opinion is based on the facts you submitted and current law. Other facts
though similar, may result in different answers.

If you have any questions or need more information, I'll be glad to help you.
Please call me toll free at 1.800.531.5441, extension 5.0330. My direct line is
512.475.00330. My email address is .

Sincerely,

Bettie Peterson
Tax Policy Division