a fingernail has a hardness of 2; a copper penny, about 3; a knife blade, 5; window glass, 5.5; and a steel file, 6.5. Here are the Mohs scale ratings for 144 types of gemstones:
Background: In the last Ambulance Open Door Forum (April 15, 2009), CMS received questions about how to correctly inform beneficiaries of potential liability for ambulance services that Medicare may not cover.he Medicare law defines the ambulance service benefit as an â ambulance service where the use of other methods of transportation is contraindicated by the individual's condition .â That is, the patientâs medical condition is such that transportation by ambulance is a clinical medical necessity.
â¢. No beds are available at the nearest hospital. Air ambulance transport to a more distant hospital or. from a hospital that is capable of treating the beneficiary. to a different hospital solely to avail the beneficiary of. the services of a specific physician or hospital will not. be covered.. MEDICARE AMBULANCE SERVICES Air Ambulance Transport When all other coverage requirements are met, air ambulance transports are covered only to an acute care hospital. Air ambulance transports to the following destinations are not covered: â¢ Nursing facilities; â¢ Physiciansâ offices; and â¢ Beneficiariesâ homes.