Argentina
Currency dynamics make Argentina's effective pricing among the lowest in the region for hair transplants and some cosmetic procedures — at the cost of a considerably longer flight (10+ hours from most US cities) and more limited English-language infrastructure than the established leaders.
Peru
A smaller but developing medical tourism sector, with growing interest particularly around dental and general wellness — not yet at the accreditation density of the established leaders.
Chile
Strong general healthcare infrastructure domestically, with a smaller but developing international-patient-focused sector, more commonly serving other South American patients than US medical tourists specifically at this point.
The honest verdict on all three
Worth watching as the regional market matures, but not currently at the accreditation density, English-language infrastructure, or established medical tourism ecosystem of Colombia, Mexico, or Brazil. See colombiamedical.co for the established leaders' current comparison.
The Takeaway
These are genuinely emerging, not yet established — worth a specific look if a specific niche (Argentina's currency-driven pricing) fits your situation, but not a default recommendation over the established leaders.