Generative Artificial Intelligence to Automate the Adaptation of Excel Health Economic Models and Word Technical Reports

Objectives In health economics and outcomes research (HEOR), many repetitive tasks could be performed by large language models (LLMs), including adapting Excel-based health economic models and associated Word technical reports to a new setting. However, it is vital to develop robust methods so that the LLM delivers at least human-level accuracy. Methods We developed LLM-based pipelines to automate parameter value adaptations for Excel-based models and subsequent reporting of the model results. Chain-of-thought prompting, ensemble shuffling, and task decomposition were used to enhance the accuracy of the LLM-generated content. We tested the pipelines by adapting 3 Excel-based models (2 cost-effectiveness models [CEMs] and 1 budget impact model [BIM]) and their associated technical reports. The quality of reporting was evaluated by 2 expert health economists. Results The accuracy of parameter value adaptations was 100% (147 of 147), 100% (207 of 207), and 98.7% (158 of 160) for the 2 CEMs and 1 budget impact model, respectively. The parameter value adaptations were performed without human intervention in 195 seconds, 245 seconds, and 189 seconds. For parameter value adaptations, the application programming interface costs associated with running the pipeline were $13.36, $6.48, and $2.65. The accuracy of report adaptations was 94.4% (17 of 18), 100% (54 of 54), and 95.1% (39 of 41), respectively. The report adaptations were performed in 128 seconds, 336 seconds, and 286 seconds. For report adaptations, the application programming interface costs associated with running the pipeline were $1.53, $4.24, and $4.05. Conclusions LLM-based toolchains have the potential to accurately and rapidly perform routine adaptations of Excel-based CEMs and technical reports at a low cost. This could expedite health technology assessments and improve patient access to new treatments.