Dermatologists find inconsistencies in Medicare off-label prescription list

Dermatologists often have good reason to prescribe a drug off-label, since the specialty deals with many rare and unique diseases, meaning evaluating treatments in randomized clinical trials may not always be feasible. Approximately a quarter of prescriptions for the ten most common dermatologic diagnoses are used off-label, and this percentage is likely higher for rare diseases. The compendia are meant to serve as a reference for which uses are medically accepted. If a medication is in the compendia, it's approved. If it's not, it's rejected.

"There's no real appeal process, so that rejection is the end of the story, and the rejection does not come with a suggestion of an alternative of what therapy might be approved instead," said the study's lead author John Barbieri, MD, a Dermatology Research Fellow at Penn. "This makes it incredibly challenging as a clinician, since we can find ourselves playing a guessing game while our patients wait for treatment."

As a result, researcher set out to get a better understanding of what the compendia do include and whether they are sufficient for current clinical realities. They made a list of accepted treatments for 22 chronic, non-infectious diseases for which off-label prescribing is an important part of treatment. They then analyzed both compendia, the American Hospital Formulary Service (AHFS) Drug Information and the DRUGDEX® Information System for inclusion of these therapies.

Overall, they found just 73 of the 238 treatments they evaluated (31 percent) were included in either compendium. Among diseases, 10 of 22 (45 percent) had one or fewer treatments included in the DRUGDEX compendium, and 15 of 22 (68 percent) had one or fewer treatments included in the AHFS. For 53 out of 238 treatments (22 percent), the medication was included in one but not the other.

"The compendia don't even agree with each other, and the literature they used as a basis for inclusion did not follow any discernable patter and was often based on decades old sources," Barbieri said.

Just 56 percent (18 out of 32) of treatments with Grade A evidence (a double-blind study) were included in either compendium. The number dropped all the way down to 10 percent (3 of 30) for Grade B evidence (a clinical trial ? 20 Subjects), but went up to 12 percent (5 of 43) for Grade C evidence and 13 percent (8 of 61) for Grade D evidence. Results from randomized controlled trials were ignored while citations from single patient case-reports and even personal communication with pharmaceutical companies were included.

"It was not uncommon for first line therapies with a Grade A or B evidence to be missing from the compendia, while second or third line therapies with a lower evidence grade were included," Barbieri said.

Researchers point out that the compendia are likely the most convenient way to make coverage decisions, but the inconsistencies that already exist combined with the rapid pace of new research and the more than 3,000 conditions managed by dermatologists means keeping them updated is logistically difficult. They propose two other potential solutions. One approach would require Medicare part D to consider evidence from literature that clinicians present during the authorization process. A second would be to develop an expert panel to review appeals for therapies not included in the compendia.