One of the most common medical billing disputes is the "phantom ambulance" bill. You called 911, the paramedics checked your vitals, told you that you were fine, and you signed a waiver and stayed home. Three weeks later, a bill for $150 or $400 arrives under HCPCS Code A0998.
The Logic of the Assessment Fee
Ambulance providers argue that the cost of dispatching a $250,000 vehicle and a professional crew is incurred the moment they leave the station. If they spent 45 minutes evaluating you on your living room floor, they used medical supplies (like EKG electrodes and glucose test strips) and labor that must be paid for. Locally, these are often voted into law as "First Responder Fees."
The Insurance Gap
Here is the problem: Medicare and most private insurance plans do not recognize A0998 as a billable event. Their contracts almost universally state they only pay for "transportation" to a medical facility. This creates a "coverage gap" where the town or company is legally allowed to charge you, but your insurance is legally allowed to refuse to pay for it, leaving the patient with 100% of the cost for a call they may have thought was "free."
Negotiation Tip: If you are billed for A0998, check your local Fire Department's bylaws. Many cities offer a "hardship waiver" or a "one-time courtesy" for assessment fees if you can prove the call was made in good faith (e.g., you actually thought you were having a heart attack).