Google Cloud Rapid Agent · Arize Phoenix · 2026
A denied appeal that gets better every time it loses.
Granum evolves insurance-appeal letters like an immune system. A naive draft matures into a champion that wins.
- 83%
- overturned when filed
- 10%
- ever appealed
- 12h
- to write by hand
One strategy starts at 0.40 and climbs to a 0.98 champion. The losers stay on the page, struck out.
how it works
It treats each appeal strategy like a living cell.
Every payer and diagnosis gets its own population. On each denial the strategies draft competing letters, a judge scores them against real overturned cases, and the losers are deleted from the registry for good. Winners branch.
- Aetna · cardiac · seed
- 40%
- appeal fitness, naive gen 0
- after 10 generations
- 98%
- appeal fitness, champion
- strategies apoptosed
- 18
- deleted from the registry, kept on record
Look inside a cell.
2 payers and diagnoses
Strategies that transfer across cells.
A champion matured against one payer is trialed against another payer's denials. The payer-specific citations don't carry over — negative selection runs on the appeal it writes in the new cell — but the matured strategy does. An edge is promoted only when it significantly lifts the target's naive baseline.
- g7m0 (aetna) unitedrejected
Scored 0.00 on united's denials versus its naive baseline 0.62 — not a significant lift (p=1.000, 5/5 rejected at negative selection). This strategy is clonally specific to its own cell.
- g6m0 (united) aetnapromoted
Scored 0.59 on aetna's denials versus its naive baseline 0.40 — a +0.19 lift, significant at p=0.024. The matured strategy writes better appeals in a payer it never trained on.