Does CPT Modifier 22 Appropriately Reflect a Difficult Pancreaticoduodenectomy? Retrospective Analysis of Operative Outcomes and Cost

Abstract

BACKGROUND: CPT coding allows addition of a 2-digit modifier code to denote particularly difficult procedures necessitating additional reimbursement, called the modifier 22. The use of modifier 22 in relation to pancreatic surgery and outcomes, specifically pancreaticoduodenectomy (PD), has not been explored. STUDY DESIGN: All PDs performed from 2010 to 2019 at a quaternary healthcare system were analyzed for differences in preoperative characteristics, outcomes, and cost based on the use of modifier 22. Adjusted logistic regression analysis was used to identify factors predictive of modifier 22 use. RESULTS: A total of 1,284 patients underwent PD between 2010 and 2019; 1,173 with complete data were included, of which 320 (27.3%) were coded with modifier 22. Patients coded with modifier 22 demonstrated a significantly longer duration of surgery (365.9 ± 168.4 vs 227 ± 97.1; p < 0.001). They also incurred significantly higher cost of index admission ($37,446 ± 34,187 vs $28,279 ± 27,980; p = 0.002). An adjusted multivariable analysis (specifically adjusted for surgeon variation) revealed duration of surgery (p < 0.001), neoadjuvant chemotherapy (p = 0.039), class II obesity (p = 0.019), and chronic pancreatitis (p = 0.005) to be predictive of modifier 22 use. CONCLUSIONS: Despite the subjective nature of this CPT modifier, modifier 22 is an appropriate marker of intraoperative difficulty. Preoperative and intraoperative characteristics that lead to its addition may be used to further delineate difficult PDs.