AMC vs CMC: Biomedical Maintenance Contracts Explain

Two staff review equipment information on a tablet in a clinical simulation room.

The basic distinction

An Annual Maintenance Contract (AMC) typically covers scheduled preventive maintenance and labour. Spare parts are charged separately when required.

A Comprehensive Maintenance Contract (CMC) typically includes spare parts within the contract price.

CMC costs more annually. It transfers the risk of an expensive component failure from you to the supplier. Terminology is not fully standardised, so read the scope rather than relying on the acronym.

When AMC is the better choice

Newer equipment still within or close to warranty; equipment with a good reliability record in your estate; low-cost replaceable parts; non-critical equipment where downtime is tolerable; and situations where you hold budget flexibility to absorb an occasional parts bill.

When CMC is the better choice

Ageing equipment approaching the period where major components fail; equipment with expensive critical components — X-ray tubes, detectors, probes, high-value boards; clinically critical equipment where downtime directly affects patient care; and institutions operating on fixed annual budgets with no mechanism to absorb unplanned capital expenditure.

For imaging in particular, a single tube or detector replacement can exceed several years of CMC premium. That calculation should be done explicitly.

What any contract must define

Response time — acknowledgement. Resolution time — repair. Preventive maintenance frequency and scope. Precisely what is included and excluded, with consumables and user-damage treated explicitly. Uptime commitment and the remedy if it is missed. Loan or standby equipment provision. Engineer location and availability. Escalation path. Parts availability commitment and end-of-support date.

Exclusions deserve the closest reading. A contract excluding the most likely failure mode is not cover.

Negotiating position

Decide before warranty expires, not after a failure. Bundle equipment across the estate for leverage. Ask for uptime commitments with meaningful remedies. Request the service history of comparable installed units. And confirm the end-of-support date — a contract on equipment the manufacturer is about to declare obsolete has limited value.

Frequently asked questions

Which is cheaper?

AMC has a lower annual cost. CMC is often lower in total cost on ageing or parts-expensive equipment.

What should be read most carefully?

The exclusions, and the end-of-support date for the equipment.

Compare the contract line by line

Scope item	Question to resolve in either contract
Assets and configuration	Which serial numbers, accessories and software are covered?
Preventive work	How many visits, which tasks and what reports are included?
Corrective support	What are the attendance hours, escalation process and restoration dependencies?
Parts	Which major components are included, capped, excluded or supplied on exchange?
External costs	Are travel, shipping, labour, software and taxes included?
End of coverage	How are open faults, renewals and unsupported components handled?

Use scenarios to understand the trade-off

Compare equivalent equipment lists and coverage before comparing annual fees. Build a low, central and high parts-cost scenario from the hospital’s own service history or quoted replacement prices. Keep hospital downtime cost separate from repair expenditure so the same loss is not counted twice.

The calculator below uses quoted fees and your annual parts and downtime scenarios. The break-even value is the AMC parts budget at which the two totals match. A positive AMC-minus-CMC result means the AMC scenario costs more. This allows procurement and biomedical teams to discuss the assumptions behind a choice instead of treating the contract label as a guarantee.

AMC and CMC cost comparison

Move the sliders to plan your requirement. Use hospital records or quoted costs for your purchasing discussion.

k = thousand; m = million; b = billion.

View results

Your estimate

Adjust the figures for your requirement.

How this estimate is calculated

AMC = AMC fee + parts budget + AMC downtime × cost per hour. CMC = CMC fee + excluded parts + CMC downtime × cost per hour. Break-even AMC parts = CMC total − AMC fee − AMC downtime cost.

These are visitor-defined annual scenarios, not predictions of failure or service performance. A negative break-even parts budget means the CMC scenario is cheaper even if AMC parts cost zero. AMC minus CMC is positive when AMC costs more. Compare equivalent coverage before comparing totals.

Initial figures are an illustrative example. Adjust them to your requirement before discussing a purchase.