Medicine in Nod is complicated by the fact that seven sapient species have seven different biologies, none of which respond identically to the same treatments, and all of which can be further altered by Nod's transformative effects. The Hospitallers are the closest thing the city has to a medical establishment.
Their clinics range from well-equipped facilities in the Annex, stocked with Earth-imported surgical instruments, anaesthetics, and imaging equipment, to single-room operations in the Warrens where the practitioner works with a Tinker-built autoclave and whatever the Alchemist's Boon had in stock that week. The best Hospitaller clinics rival Earth hospitals in their equipment if not their staffing while the worst are closer to field medicine.
Hospitaller clinics operate in the Warrens, the Annex, and several other districts, staffed by a mix of trained physicians, surgeons, alchemists, and a small number of Shifters whose specialty is biological repair. Treatment is available to any species, though the quality varies with the practitioner's experience. A Hospitaller who has spent decades treating Kaarn knows their biology well enough to manage growth instabilities and be stumped by the issues of a Woven colony. The network of members allows for a referral and consulting system that helps moderate this difficulty.
The Hospitallers are funded through patient fees, charitable contributions from the wealthier districts, and occasional Council stipends that arrive irregularly and come with strings. They maintain a formal code of neutrality modelled on the Pallbearers' example, treating the wounded of all factions without discrimination. In practice, this neutrality is tested regularly by the Prefex, who would prefer that certain patients not recover, and by the Slavers Guild, which has its own ideas about what constitutes medical care.