What the DEG Is
The Database Enhancement Gateway, commonly called the DEG, is a service administered by the National Auto Body Council. It provides a formal channel for shops, appraisers, and insurers to submit estimating questions directly to the database providers (CCC/MOTOR, Mitchell, and Audatex) and receive written responses on the record.
The DEG has processed tens of thousands of inquiries since it was established. Each resolved inquiry is published with a number, the original question, the platform it was submitted to, and the written response from the database provider. These records are publicly accessible and permanent.
Why DEG Inquiries Matter for Supplement Arguments
A DEG inquiry response is not an opinion or an interpretation. It is a written answer from the company that built the estimating database, confirming how a specific operation should be handled in their platform.
When you cite a DEG inquiry number in a supplement note, you are referencing a published, verified statement from the database provider that the insurer's adjuster is trained to use. The adjuster cannot dismiss it as a shop estimate or a vendor claim. It removes the adjuster's ability to deny an operation by simply asserting that the database does not support it.
How to Read a DEG Inquiry
Each DEG inquiry record includes four elements: the inquiry number, the platform it was submitted to, the question as submitted, and the response from the database provider.
A typical inquiry for blend time would be submitted as: "Does the Mitchell refinish allowance for a repaired panel include blend time on an adjacent panel?" The response would state that blend time on adjacent panels is not factored into the refinish allowance and must be negotiated separately. The inquiry number is what you include in the supplement note. You do not need to quote the entire response.
Which DEG Inquiries Cover the Most Common Denials
Over 22,000 DEG inquiries have been resolved across CCC, Mitchell, and Audatex. The ones most relevant to supplement arguments fall into predictable categories.
Refinish operations: multiple DEG inquiries confirm that blend time, feather/prime/block, and color sand and buff are not included in standard refinish allowances. DEG Inquiry #17278 specifically confirms Mitchell's position on blend time. Corrosion protection: DEG Inquiry #12847 confirms that MOTOR requires separate manual entry. ADAS calibration: a series of inquiries across all platforms confirm pre- and post-repair calibration is not included. Seam sealer and weld-through primer: multiple inquiries confirm these as separate billable operations.
How DEG Inquiries Work Alongside P-Page Citations
P-pages and DEG inquiries work together in a supplement note. The P-pages establish the general rule from the platform documentation. The DEG inquiry confirms the specific application of that rule through a direct question and answer with the database provider.
Together, they create an argument that the adjuster cannot credibly deny with a form response. The standard supplement note structure places the P-page citation first, the DEG inquiry reference second, and the operational basis for this specific repair third.
The Research Problem
Finding the right DEG inquiry number for a specific operation and platform is not always fast. The DEG database has over 22,000 records. Searching it, cross-referencing by platform, and matching the inquiry to the denied operation on your claim adds time to every supplement round.
For shops running multiple claims a month, this research is one of the biggest time costs in the supplement process. The citations exist. Getting to them quickly enough that the math of fighting every denial still works is the challenge.
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