The CDT Code Decoder: What Those Letter-Number Combos on Your Dental Bill Actually Mean

D2740. D4341. D6010.

If you've ever looked at a dental treatment plan or an Explanation of Benefits and wondered what those codes mean, you're not alone. Most patients never learn what they're actually being billed for — and that information gap has a real cost.

Here's a practical guide to the codes that appear most often on dental bills, in plain English.

What CDT Codes Are (And Why They Matter)

CDT stands for Code on Dental Procedures and Nomenclature — the standardized billing system used by virtually every dental practice in the United States, maintained by the American Dental Association.

Every dental procedure has a CDT code. When your dentist submits a claim to your insurance company, they use these codes. When they quote you a price, they're quoting the fee attached to a specific code.

Why does knowing the code matter? Because it's the only way to independently look up what the going rate for that procedure actually is — in your market, for your insurance status. The code is the key to the benchmark.

The Most Common CDT Codes Decoded

D1110 — Adult prophylaxis (cleaning) Your standard twice-yearly cleaning. Includes scaling (scraping), polishing, and sometimes fluoride. This is one of the most frequently billed codes in dentistry — and one of the easiest to benchmark. If you're paying more than $180–200 out of pocket in most markets, ask questions.

D2740 — Porcelain crown (noble metal substrate) The classic full-coverage crown. A cap that covers the entire visible portion of a damaged or decayed tooth. One of the highest-value procedures and one of the most price-variable. Depending on your market, fair pricing ranges from roughly $1,000 to $1,600 at the 70th percentile.

D2392 / D2393 — Composite fillings (2- and 3-surface) Tooth-colored fillings. The number after "D239" tells you how many surfaces of the tooth are involved — more surfaces, higher fee. These are bread-and-butter restorations and should be priced conservatively.

D3330 — Root canal, molar Removal of infected pulp from a back tooth. Significantly more complex than anterior root canals due to multiple canal anatomy. This is frequently the code that generates sticker shock — and also one where second opinions are most worth getting.

D4341 — Periodontal scaling and root planing, per quadrant Deep cleaning below the gumline, one quarter of the mouth at a time. Often recommended when standard cleaning is no longer sufficient. The "per quadrant" part matters — a full-mouth SRP is four separate D4341 billings.

D6010 — Implant placement (surgical) The titanium post that goes into the jawbone to anchor a future crown. This is just the surgical phase — the crown (D6065) is billed separately, as are any bone grafts required. Understanding what's included in an implant quote is critical because bundling and unbundling practices vary widely.

D7210 — Surgical extraction, impacted tooth Removal of a tooth that is fully or partially embedded in bone — think wisdom teeth. More complex than a simple extraction (D7140) and priced accordingly.

How to Use This Information

Once you know your CDT code, you can benchmark your quote in seconds at DentalQuoteCheck.com. Enter the code, your ZIP, your quoted price, and your insurance status. You'll see where your quote falls relative to the 50th, 70th, and 90th percentile for your specific market.

You don't need to become a dental billing expert. You just need to know the code — and now you know where to look it up.

DentalQuoteCheck.com is a free, independent tool built by Dental Strategy Institute to help patients make more informed decisions about dental care. Not affiliated with any dental practice or insurance company.