Phototherapy Billing (96900, 96910, 96920-96922)

Which code the session falls under

• 96900 — ultraviolet light actinic therapy, the general UV treatment code where no tar or photosensitiser is applied.
• 96910 — photochemotherapy: tar and ultraviolet B, or petrolatum and UVB. The topical agent is part of the code, not a separate charge.
• 96912 — photochemotherapy with psoralen and ultraviolet A (PUVA).
• 96913 — photochemotherapy requiring at least four to eight hours of care under direct physician supervision, for severe photoresponsive dermatoses.
• 96920, 96921, 96922 — laser treatment for inflammatory skin disease, banded by total area treated: under 250 sq cm, 250 to 500 sq cm, and over 500 sq cm.

How phototherapy behaves across a treatment course

Phototherapy is a course, not an event. A psoriasis or vitiligo patient may attend two or three times a week for months, and each attendance is a separately reportable session. The failure mode is administrative rather than clinical: nurse-run sessions that never generate a charge because no provider note was opened, or sessions logged in the phototherapy log book and never reconciled against the claims that went out that week.

The second failure mode is the evaluation and management service. A routine phototherapy visit is the treatment code alone. Where the physician genuinely evaluates disease response and changes the protocol, an E/M with the distinct-service modifier may be supportable, but appending it to every session is the pattern payers screen for and it puts the whole course at risk.

Coverage, prior authorization and home units

Most payers cover office phototherapy for psoriasis, vitiligo, atopic dermatitis, mycosis fungoides and a defined set of photoresponsive conditions, usually after documented failure of topical therapy. Coverage articles frequently cap the number of sessions per course or per year, and continuing past that cap without a documented response assessment converts a payable course into a bad-debt one.

Home ultraviolet units are billed differently. The equipment goes through the durable medical equipment benefit under the supplier's own claim, not the practice's, while the practice bills only for the supervisory evaluation visits. Practices that assume they can bill treatment codes for home sessions accumulate denials the patient ends up seeing on their statement.

What each session must record

• The date and the treatment modality, matched to the code family.
• The dose delivered and the cumulative dose across the course.
• The body area treated, and for laser codes the total treated area in square centimetres, since that number selects the code.
• Response since the previous session and any protocol change.
• The supervising provider, and for 96913 the period of direct supervision.