CPT code 96573 – Photodynamic therapy billing guide

Key takeaways

CPT Code 96573 reports photodynamic therapy by external application of light when a physician or QHP applies the drug and activates the light, per day.

96567 reports the same service delivered by staff without direct physician or QHP involvement, and 96574 adds debridement of hyperkeratotic lesions first.

Only one of 96567, 96573 or 96574 can be reported per patient per day, and modifier 59 does not unbundle them.

Bill the drug on its own line: J7308 for Levulan Kerastick per 354 mg unit, or J7345 for Ameluz gel per 10 mg.

Pair the claim with L57.0 for actinic keratosis, and document who applied the drug and who activated the light.

CPT Code 96573: definition and official descriptor

CPT Code 96573 is the Category I CPT code for photodynamic therapy (PDT) by external application of light. In other words, a physician or other qualified health care professional (QHP) provides it. The American Medical Association (AMA) maintains the descriptor as part of its CPT code set, and it reads:

Photodynamic therapy by external application of light to destroy premalignant lesions of the skin and adjacent mucosa with application and illumination/activation of photosensitizing drug(s) provided by a physician or other qualified health care professional, per day.

Three details in that wording drive the coding. First, the physician or QHP must be directly involved in applying the drug and activating the light. The code is per day, so one unit covers every lesion treated in the session. The descriptor also targets premalignant lesions, so the usual diagnosis is L57.0 for actinic keratosis, from the ICD-10-CM code set.

What 96573 covers and what it excludes

96573 covers one complete PDT session on one date. In particular, it includes both the application of the photosensitizing drug and the light activation, as long as a physician or QHP is directly involved in both.

Included in CPT Code 96573:

• Application of the photosensitizing drug by the physician or QHP
• Illumination or activation of the drug with an external light source, blue or red
• Every lesion treated in that session, reported as one unit per day

Not included, so bill it separately or use a different code:

• The photosensitizing drug itself, which is billed with J7308 or J7345
• Debridement of hyperkeratotic lesions by curettage or abrasion before PDT. That session is reported with 96574 instead of 96573, not in addition to it
• A session where staff apply the drug and run the light without direct physician or QHP involvement, which is reported with 96567
• A significant, separately identifiable E/M service on the same date, reported with modifier 25 on the E/M code
• Destruction of other lesions by a different method, such as cryotherapy, which is coded on its own and checked against NCCI edits

How PDT for actinic keratosis maps to billable steps

A PDT visit has three clinical phases. They map to one procedure line and one drug line, and who performs the phases decides the CPT code.

1. Photosensitizer application: The clinician applies aminolevulinic acid, either Levulan Kerastick or Ameluz, to the treatment area. In addition, the drug is reported with its HCPCS code, J7308 or J7345, in units based on the amount applied. Document the product, NDC, lot number, quantity and who applied it.
2. Incubation: The lesions absorb the drug over a period set by the product label and the practice protocol. Also, incubation is not billed separately. Likewise, record the start and end times in the note.
3. Illumination (activation): The treated area is exposed to an external light source. Levulan is labeled for blue light and Ameluz for red light, but the light source does not change the CPT code. Finally, document the device, wavelength, dose and duration.

The CPT code covers the application and the illumination together. First, if a physician or QHP was directly involved in both, report 96573. Second, if staff handled them without that involvement, report 96567. Finally, if the physician debrided hyperkeratotic lesions first, report 96574 on its own. The diagram below runs the same test as two questions.

Billing aminolevulinic acid: HCPCS J-codes for the drug

The photosensitizing drug is not bundled into 96573. Instead, it is a separately billable supply, reported on the same claim with a HCPCS Level II J-code. The J-code reports what was applied, and the CPT code reports what the clinician did. The J7308 guide covers billing the Levulan Kerastick on its own.

Q2037 and Q2038 are influenza vaccine codes, not PDT drug codes. As a result, a claim that pairs 96573 with either one will not match the service. Many Medicare Administrative Contractors (MACs) also ask for the National Drug Code (NDC) next to the J-code. Therefore, confirm your contractor’s NDC rules before you submit.

CPT 96573 vs 96567: key differences and when to use each

The two codes describe the same PDT service. However, what separates them is who provides it. 96573 requires direct physician or QHP involvement in applying the drug and activating the light, while 96567 covers PDT delivered without that involvement.

The practical test is in the procedure note. First, find who applied the photosensitizer and who started the illumination. If the physician or QHP did both, 96573 fits. Otherwise, if a nurse or medical assistant did both under protocol, 96567 fits. The drug and the light device do not decide the code.

How 96574 relates to 96573

96574 is a standalone code, not an add-on. Instead, it describes PDT provided by a physician or QHP, preceded by debridement of premalignant hyperkeratotic lesions by targeted curettage or abrasion. Consequently, on a day when that debridement happens, it replaces 96573.

• One code per day: Report 96574 instead of 96573, never alongside it. NCCI treats 96567, 96573 and 96574 as mutually exclusive on the same date of service.
• Debridement method: The descriptor names targeted curettage and abrasion. However, an auditor may not accept chemical peeling as debridement.
• Documentation: The note must state the debridement method, the lesions treated, and that it came before drug application. In fact, a note that says only that PDT was performed supports 96573 at most.
• Physician involvement: Like 96573, 96574 requires the physician or QHP to apply the drug and activate the light.

The CPT code 96574 guide covers debridement documentation in more detail.

Medicare and commercial payer coverage for PDT

Medicare’s national coverage for actinic keratosis treatment sits in National Coverage Determination (NCD) 250.4. It covers PDT among the accepted treatments for actinic keratosis, without limits based on lesion count or location. Each session still has to be medically necessary, and the MAC judges how many visits are reasonable.

• Diagnosis code: ICD-10-CM code L57.0 (actinic keratosis) is the primary diagnosis. Also, document the lesion count and anatomical location in the note.
• Medical necessity: The chart note must show clinically diagnosed AK lesions and why PDT is the appropriate treatment. Moreover, a diagnosis of AK alone is not enough if the note lacks a description of the lesions.
• Physician involvement: For 96573, the note must show that the physician or QHP applied the drug and activated the light. Otherwise, a note that shows staff-only delivery supports 96567.
• Prior authorization: Medicare Part B generally does not require prior authorization for 96573. Commercial payer rules vary widely, so confirm with each payer before scheduling.
• Commercial policies: Many commercial payers publish their own PDT policies, and some set frequency limits or step therapy. Thus, check the plan before each new treatment series.

The billing compliance requirements for PDT extend beyond diagnosis codes. For example, they include credentialing, place-of-service accuracy and timely filing. Holding to all of them in a dermatology practice takes a systematic claim review process.

Medicare reimbursement for CPT Code 96573

The Medicare Physician Fee Schedule (MPFS) sets separate rates for non-facility (office) and facility settings. As a result, office-based PDT pays the higher non-facility rate, because the practice absorbs overhead such as the light device and treatment room. Then, use the CMS Physician Fee Schedule lookup tool to pull current rates for your payment locality.

Confirm that the J-code for the photosensitizer has its own line on the same claim. In addition, the drug is paid separately and is not part of the 96573 MPFS rate.

Documentation that supports a 96573 claim

An auditor reviewing a 96573 claim looks for seven elements in the chart note. Missing any one of them can therefore trigger a denial, recoupment or audit flag. Submitting clean claims for PDT depends on building these elements into the template your providers use for every PDT visit.

• Diagnosis: ICD-10-CM L57.0 (actinic keratosis), with lesion count and anatomical location documented in the note body
• Photosensitizer: Product name, NDC, lot number, quantity applied and time of application, which support the J-code and its units
• Incubation: Start and end time of the incubation period before illumination
• Light source: Device used and its wavelength, such as blue light at about 417 nm or red light at about 635 nm
• Illumination parameters: Duration of illumination and total fluence delivered (in J/cm²)
• Physician or QHP involvement: Name and credentials of who applied the drug and who activated the light, which decides between 96573 and 96567
• Debridement: If curettage or abrasion was performed, a note of the method and lesions, and the session is reported with 96574 instead

Modifiers used with 96573

Modifier errors on 96573 claims usually come from an E/M service on the same date, or from trying to report two PDT codes together. Also, the AAPC Codify CPT lookup is a useful reference for bundling edits.

Why 96573 claims get denied and how to fix them

96573 denials follow predictable patterns, and a pre-submission check catches most of them. Moreover, denial management workflows in dermatology work best with root-cause tracking rather than claim-by-claim fire-fighting.

• Missing or incorrect ICD-10 code: The diagnosis on the claim is not on the payer’s covered list. Fix: confirm L57.0 is on the claim and that the lesion documentation supports it.
• Missing or wrong drug code: 96573 went out without J7308 or J7345, or with a code that is not a PDT drug, such as Q2037. Fix: report the J-code for the product applied, with the NDC if the payer requires it.
• Two PDT codes on one date: 96573 was billed with 96567 or 96574. Moreover, NCCI allows only one PDT code per patient per day. Fix: report only the code that matches the session.
• Staff-delivered session billed as 96573: The note shows staff applied the drug and ran the light. Fix: report 96567, or document the physician’s direct involvement when it took place.
• Multiple units: 96573 was billed per lesion or per area. Fix: report one unit per day.
• Place-of-service mismatch: The POS on the claim does not match where PDT took place. Fix: check the POS before submission. See the section below for facility and non-facility rules.
• Prior authorization not obtained: The commercial payer required prior authorization. Fix: build an eligibility and authorization check into PDT scheduling, and put the authorization number on the claim.

Place of service and setting rules

Place of service 11 (Office) is the standard setting for 96573. In fact, most PDT for actinic keratosis happens in outpatient dermatology offices, and the Medicare non-facility rate assumes that overhead. Otherwise, a different POS code is a common source of payment reductions and rework.

• POS 11 (Office): Standard setting. Medicare pays the non-facility rate, which is higher because the practice absorbs equipment and overhead costs.
• POS 22 (On-Campus Outpatient Hospital) or POS 19 (Off-Campus Outpatient Hospital): The physician bills the professional component on the 837P (CMS-1500) at the facility rate. Meanwhile, the hospital bills its facility fee on the 837I (UB-04). As a result, keep the two claims separate.
• POS 22 used for an office service: The facility rate for 96573 is lower than the non-facility rate. Thus, the practice expense RVU drops when a facility absorbs overhead. Billing POS 22 for an office service can lower payment and may need a corrected claim.

Checking the place of service before submission prevents most of these errors. So does an insurance eligibility verification process that confirms the benefit for that setting.

How Pabau supports PDT billing for dermatology practices

PDT billing breaks down in the handoffs. First, the note records who applied the drug, the stock record shows which product and how much, and the claim has to match both. Pabau, the practice management platform we build, keeps the visit, the note and the claim on one patient record.

Pabau’s claims management software holds the claim your coders build from the note. Through Pabau’s integration with Claim.MD, it submits claims electronically, checks eligibility before the session and tracks remittances. Denial reason codes from the remittance then sit next to the claim they belong to.

Your coders still choose between 96567, 96573 and 96574. Pabau’s digital forms can prompt the clinician to record who applied the drug and who ran the light, so that choice rests on the note.

Keep PDT claims tied to the note behind them

Pabau keeps the PDT note, the drug applied and the claim on one patient record. Claim.MD submits the claim electronically, checks eligibility and tracks the remittance.

Book a demo

Conclusion

CPT Code 96573 turns on one question: who applied the drug and activated the light. First, a physician or QHP doing both makes it 96573. Staff doing both makes it 96567, and debridement first makes it 96574.

In addition, only one of those codes goes on the claim for a given day. The drug goes on its own line as J7308 or J7345, and L57.0 carries the medical necessity. When those three lines match the note, a PDT claim gives a payer little to deny.

Book a demo to see how Pabau keeps the PDT note, the drug and the claim on one patient record.

Continue your research

Billing debridement before PDT? CPT code 96574 covers the documentation that separates it from 96573.

Confused about CO-4 and CO-11 denial codes? Denial codes in medical billing explains the most common CARC codes and the appeal actions that resolve each one.

Billing the Levulan Kerastick? HCPCS code J7308 explains the drug line that goes on the same claim as 96573.

Want to reduce claim rework across your practice? What is revenue cycle management covers the full workflow from eligibility check through payment posting.

Frequently asked questions