Verdict: A physical, bricks-and-mortar clinic in Munduk is not a good idea. The numbers don't support it. Only a mobile/on-call service is viable.
Munduk village has essentially NO commercial clinic-grade rental supply. Searches returned nothing specific to the village — commercial listings cluster in Singaraja/Lovina/Seririt. The village famously has no ATM (nearest in Seririt, 20 min away).
Roughly 28–50 guest properties, mostly 1-bedroom units hosting 2.2 guests average (couples/solo). Even at 60–70% high-season occupancy, total visitor flow is small — a few hundred tourists at peak, dropping to a handful in wet season.
The demand problem isn't that people don't get sick in Munduk — it's that there aren't enough people, and they don't stay long enough. A clinic can't cover rent + staff + utilities with Munduk's transient population outside the 3–4 peak months.
Steep, slippery waterfall trails (Melanting has 450 steep, uneven stairs), 3,151mm annual rainfall, and cooler temperatures genuinely cause ankle sprains, slips, hypothermia/colds. But this is episodic, seasonal, and self-limiting — not enough to justify a permanent physical clinic.
Break-even ≈ 2 patients/day — but those 2/day don't reliably appear outside peak season. A physical clinic would bleed during low season (6 months of the year).
It fails the demand-certainty test. The only viable angle is a lean mobile/doctor-on-call service contracted to the villa/hotel cluster — low CAPEX, low OPEX, break-even on 1–2 visits/week, run out of your Lovina base.