Clinical coding is one of the few places in a hospital where a software error has a directly calculable dollar value. Under activity based funding, the 2025-26 National Efficient Price is $7,258 per NWAU(25), a 5.9% increase and the largest since national ABF began. A tonsillectomy is 0.7421 NWAU, about $5,386. A hip replacement at minor complexity is 4.0251 NWAU, about $29,214. Miss an additional diagnosis that shifts complexity level and you have moved five figures on a single episode.
That is why coding keeps coming up when we talk to health CIOs about where AI might actually pay for itself, and it is why we keep giving the same answer: build a suggestion engine, not a coding engine. This post is part of our Practical AI in Health series, and it covers the architecture we would put in front of a coding team, what the evidence supports, and what it costs.
The problem is scale, not competence
Separations grew about 7%, from 11.3 million in 2018 to 12.1 million in 2022, while the coder workforce ages and universities close their health information management programs. Half the previously offered undergraduate HIM courses were discontinued because enrolments were too low, which the AIHW flagged in its analysis of the coding workforce shortfall. Northern Health in Victoria moved off its legacy coding system for exactly this reason. Its health information services director Odette Taylor said the AI component reduces the need to scale up the coding workforce as separations rise, with real-time feedback to coders supporting accurate DRG and NWAU reporting.
