Same Magento, different sub-stacks lit up.
Single-clinic supplier (1-5 employees, <500 SKUs, <$500k GMV): Magento Open Source + Hyvä, single store-view, no B2B layer, basic HIPAA posture (encryption + BAA hosting + audit log), one distributor EDI (usually McKesson SupplyManager), DME billing handoff to whatever single-system the clinic runs (often Bonafide or a spreadsheet). Total build: $5k, $15k. Ongoing: $400, $1,500/mo. Decision matters mainly: don’t buy McKesson Connect’s reseller portal, you lose customer ownership and SEO.
Mid-size DME ($2M, $10M GMV, 5,000-50,000 SKUs): Magento Open Source + Hyvä, B2B + B2C with customer-group catalogs, 1-2 distributor EDIs, full prior-auth checkout, 21 CFR Part 820 lite (design controls + CAPA + complaint handling), Brightree or CareCloud handoff, GPO membership if applicable. Total build: $25k, $70k. Ongoing: $2k, $4k/mo. This is the sweet spot for most clients I work with.
200-bed hospital procurement portal (B2B-only, contract pricing, Vizient/Premier/HealthTrust GPO): Adobe Commerce + B2B Companies module (worth the $30k+/yr Adobe Commerce license at this scale for the native multi-step approvals + requisition lists), 3-5 distributor EDIs in parallel (McKesson + Cardinal + Medline + Henry Schein + maybe AvaCare), full 21 CFR Part 820 + HIPAA + DSCSA, recall workflow with FDA MedWatch reporting, integration with the hospital’s procurement system (Workday, Oracle, SAP Ariba) via EDI 850 inbound. Total build: $80k, $300k. Ongoing: $5k, $12k/mo.
Architecture scales linearly; the difference is which modules you light up, not which platform you’re on.