For EMS directors and ambulance billing managers, Medicare reimbursement has always carried a familiar frustration. Payment rates have not kept pace with the actual cost of delivering ground ambulance services, and for decades that gap was difficult to quantify in a way that could drive meaningful policy change. That is changing. The Medicare Ground Ambulance Data Collection System (GADCS) represents a significant shift in how CMS gathers cost data from ambulance providers, and every EMS agency needs to understand what it requires, what is at stake, and how strong billing operations connect directly to this process.
What Is the Medicare Ground Ambulance Data Collection System?
The GADCS is a CMS-mandated data collection program requiring selected ground ambulance providers and suppliers to report detailed information on costs, revenue, utilization, and service mix. Congress required CMS to establish this system to develop a clearer, evidence-based picture of what it actually costs to operate a ground ambulance service across different communities and provider types.
CMS selects organizations to participate on a rotating basis. Selected organizations are required to collect data over a continuous 12-month period and report that data through the GADCS portal within five months after the data collection period ends. The data collected covers the full breadth of an organization’s operations, not just Medicare-related activity, including total expenses, all revenue sources, service volume, and payer mix.
Organizations that are selected but fail to report the required information are subject to a 10 percent reduction in payments under the Medicare Part B Ambulance Fee Schedule for a calendar year. A hardship exemption process exists, but the penalty for non-compliance is significant and avoidable.
Why This Data Matters for the Future of EMS Reimbursement
The GADCS is not just a compliance exercise. It is the foundation for potential reform of the Medicare ambulance fee schedule, which has not been comprehensively updated in more than two decades. It has been more than 20 years since CMS revised ambulance payment rates through a negotiated rulemaking process that was exclusive of actual cost data or inflationary considerations.
The first major report from this effort, prepared by the RAND Corporation and released in December 2024, offered a sobering look at the current state of ambulance reimbursement. Data collected from 3,694 ambulance agencies for the years 2022 and 2023 showed that across all payer classifications, ambulance agencies are under-reimbursed an average of $1,526 per transport. For Medicare specifically, the average reimbursement gap is $2,334 per transport.
These findings underscore why complete, accurate cost reporting matters. The data EMS agencies submit becomes part of the evidence base that informs whether and how Medicare payment rates are adjusted. Agencies that report thoroughly and accurately contribute to an industry-wide case for better reimbursement. Agencies that underreport, report inaccurately, or fail to report at all weaken that case and face penalties in the process.
What EMS Agencies Are Required to Report
The GADCS data collection instrument covers several categories of information that agencies must track and document carefully:
- Cost data: Total operating expenses including labor, vehicle costs, fuel, equipment, supplies, and overhead
- Revenue data: All revenue sources across Medicare, Medicaid, commercial insurance, and self-pay
- Utilization data: Transport volume, level of service mix, and call type distribution
- Service area and operational information: Geographic and structural characteristics of the agency
The requirement applies to all types of ground ambulance organizations, including fire department-based services, municipal EMS agencies, and private ambulance providers. All organizations that provide ground ambulance services, including those that also provide fire, police, or other public safety services, must report if selected.
The Connection Between Billing Performance and Cost Reporting
Accurate cost reporting starts with accurate billing. An EMS agency that is leaving revenue on the table through undercoded claims, unworked denials, or weak accounts receivable management will present cost and revenue data that does not reflect its true financial picture. That misrepresentation can work against the agency in two ways: it may understate the true gap between costs and reimbursement, and it reflects a revenue cycle that is not performing at its potential.
This is where a specialized ambulance billing partner makes a measurable difference. New England Medical Billing Group has spent more than 30 years focused exclusively on ambulance billing for EMS agencies across New England and beyond, serving more than 250 clients with a team of dedicated billing professionals. Our ambulance billing team maintains a 98% clean claim submission rate and a 95% collection rate across our EMS client base. Claims are submitted within 48 hours of receipt and denied claims are worked within 48 hours of the denial. That level of performance means the revenue data our clients report through GADCS reflects what they actually earned, not what fell through the cracks of an underperforming billing operation.
When your billing is running at full capacity, your cost reporting tells an accurate story. When it is not, the gap between reported revenue and actual costs looks smaller than it is, and the case for adequate reimbursement weakens.
What to Do If Your Agency Is Selected
If your agency receives a GADCS notification letter from CMS, there are immediate steps to take. You must respond to the notification letter and submit your data collection period start date and contact information within 30 days of receipt. From there, your agency will collect the required data across the designated 12-month period and report through the GADCS portal within the five-month window after collection ends.
Preparation matters. Agencies with clean, well-organized billing records and strong revenue cycle documentation will find the reporting process far more manageable than those working from incomplete or inconsistent data. Building that foundation before a selection letter arrives is the right approach. If your agency wants to learn more about why EMS agencies across New England choose NEMB as their billing partner, we are ready to help you get there.
Final Thoughts
The Medicare Ground Ambulance Data Collection System is one of the most consequential developments in EMS reimbursement policy in years. The data being collected today has the potential to reshape how Medicare pays for ambulance services. For EMS agencies, participating accurately and completely is both a compliance obligation and a contribution to an industry-wide effort to close the gap between what it costs to deliver emergency care and what Medicare pays for it.
Strong billing performance is the foundation that makes accurate reporting possible. If your agency is ready to strengthen its revenue cycle and ensure your billing operation is performing at the level your mission demands, contact our team to schedule a free consultation and learn how NEMB can help.
Call 888-771-6115 today.
