CPT 97033Physical Therapy

App mdlty 1+iontphrsis ea 15

CPT code 97033 covers iontophoresis, a therapy that uses electrical current to deliver medication through the skin to treat inflammation, pain, or other musculoskeletal conditions. Each 15-minute session of this treatment is billed separately.

Showing rates for

National Average

Base Medicare rate

$18.76

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

0.26

PE RVU (NF)

0.31

MP RVU

0.01

Total RVU

0.58

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Document exact start and stop times for each 15-minute unit; Medicare requires 8+ minutes for the first unit (midpoint rule no longer applies to untimed codes, but 97033 is time-based)
Impact: Prevents downcoding from multiple units to single unit, protecting $18.76 per unit revenue
Bill only one unit per day per area treated; Medicare considers 97033 a daily modality with limited multiple-unit scenarios
Impact: Reduces audit risk and denial rate; attempting multiple daily units results in 60-80% denial rate based on LCD policies
Always document the specific medication used, concentration, polarity, current intensity (mA), and patient's response to treatment
Impact: Increases clean claim rate by 35-40%; missing medication documentation is the #1 reason for medical review
Verify that iontophoresis is not bundled with other modalities under your local LCD; some MACs bundle it with hot/cold packs or electrical stimulation
Impact: Prevents automatic denials; bundled claims require resubmission with modifier 59 and supporting documentation
Ensure medical necessity clearly links the iontophoresis to the patient's primary diagnosis and treatment goals in the plan of care
Impact: Reduces denial rate from 25% to under 5% for medical necessity reviews
Check for skin integrity and contraindications (pacemakers, pregnancy, metal implants at treatment site) and document the assessment
Impact: Protects against liability claims and supports medical necessity; missing contraindication screening triggers quality audits

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 97033 in 2025?

The 2025 Medicare national average payment for CPT 97033 is $18.76 for both facility and non-facility settings. This rate is based on 0.58 total RVUs (0.26 work RVU, 0.31 PE RVU, 0.01 MP RVU) multiplied by the 2025 conversion factor of 32.3465.

How many times can you bill CPT 97033 in one day?

Medicare typically allows only one unit of 97033 per day per treatment area. While the code is time-based (per 15 minutes), most Local Coverage Determinations limit iontophoresis to one daily application. Billing multiple units requires exceptional documentation justifying separate sessions or distinct anatomical sites with modifier 59.

What medications are commonly used for iontophoresis billing under 97033?

Common medications include dexamethasone sodium phosphate (anti-inflammatory, negative polarity), lidocaine (pain relief, positive polarity), acetic acid (for calcific deposits, negative polarity), magnesium sulfate (muscle relaxant, positive polarity), and zinc oxide (wound healing, positive polarity). The specific medication and concentration must be documented for proper billing.

Is CPT 97033 subject to Medicare therapy caps?

While the therapy cap has been repealed, CPT 97033 counts toward the therapy threshold amount that triggers additional medical review. When combined physical therapy and speech-language pathology services exceed $2,350 (or occupational therapy exceeds $2,350), claims require modifier KX and additional documentation supporting medical necessity.

What diagnosis codes support medical necessity for 97033?

Commonly accepted diagnoses include epicondylitis (M77.0-M77.1), plantar fasciitis (M72.2), shoulder tendinitis (M75.3), bursitis (M70-M71 series), calcific tendonitis (M65.2), myositis (M60 series), and localized inflammatory conditions. Medical necessity depends on documentation showing conservative treatment failure and expected functional improvement.

Can physical therapy assistants perform iontophoresis and bill 97033?

Yes, physical therapy assistants (PTAs) can perform iontophoresis under appropriate supervision as defined by state practice acts. However, the supervising physical therapist must establish the plan of care, and supervision requirements vary by state and payer. The service is billed under the supervising PT or facility, not the PTA individually.

What is the difference between CPT 97033 and 97014 for electrical stimulation?

CPT 97033 is specifically for iontophoresis, which delivers medication through electrical current, while 97014 covers unattended electrical stimulation for therapeutic purposes without medication delivery. Code 97033 is time-based (per 15 minutes) and requires constant attendance, whereas 97014 is unattended. These codes should not be billed together for the same treatment area on the same date without exceptional documentation.