If you have ever sat in a dental chair and heard the dentist say, “Let’s take a BWX,” you might have wondered what that actually means. And if you have looked at your dental insurance statement afterward, you have probably asked yourself: what is the dental code for one BWX?
You are not alone. Thousands of patients and even some front-desk team members find dental coding confusing. The good news is that it does not have to be complicated.
In this guide, we will break down everything you need to know about the specific dental code used for a single bitewing X-ray. We will look at why dentists take this image, how much it typically costs, what insurance covers, and how to read your dental claim like a pro.
By the end of this article, you will feel confident talking to your dentist about your X-rays. You will also understand exactly what that code on your bill means—and whether you are being charged fairly.
What Is a BWX? A Simple Explanation
Before we talk about the code itself, let us make sure we understand what a BWX actually is.
BWX stands for bitewing X-ray. This is a specific type of dental radiograph. The name comes from the small wing-shaped piece of paper or plastic you bite down on during the procedure.
Why Do Dentists Take Bitewing X-Rays?
Bitewing X-rays serve one main purpose: they show the crowns of your upper and lower teeth in a single view. More importantly, they reveal the spaces between your teeth.
Here is what your dentist is looking for:
- Cavities between teeth – These are impossible to see with the naked eye.
- The height of your bone – This helps detect gum disease.
- The fit of existing fillings or crowns – To check for leakage or decay underneath.
- Early signs of dental issues – Before they become painful or expensive.
A single BWX typically shows two to four teeth at once. Dentists often take a set of four bitewings to see the entire back teeth area. But sometimes, they only need one.
When Would You Need Just One BWX?
You might think that dentists always take multiple X-rays. That is not true. There are several common situations where a single bitewing is enough.
For example:
- You are a new patient who recently had X-rays elsewhere, but one area needs a second look.
- You have a specific complaint, like pain between two teeth.
- Your dentist is checking the progress of a small cavity over time.
- You have limited insurance coverage, and your dentist wants to be efficient.
- You are pregnant, and your dentist is minimizing radiation exposure.
In these cases, ordering one BWX makes perfect sense. And that single image has its own special dental code.
The Exact Dental Code for One BWX
Let us answer the main question directly.
The official dental code for one BWX is D0270.
According to the Current Dental Terminology (CDT) code set published by the American Dental Association (ADA), D0270 is defined as:
“Bitewing – single film”
That is it. One code. One image. One clear purpose.
How D0270 Differs from Other Bitewing Codes
To understand D0270 better, it helps to see it next to the other common bitewing codes. Here is a simple comparison table.
| CDT Code | Description | Number of Films | When Used |
|---|---|---|---|
| D0270 | Bitewing – single film | 1 | One specific area or follow-up |
| D0272 | Bitewing – two films | 2 | Limited view, often one side of the mouth |
| D0273 | Bitewing – three films | 3 | Less common; transitional view |
| D0274 | Bitewing – four films | 4 | Complete back teeth evaluation |
| D0277 | Vertical bitewing – seven to eight films | 7-8 | Detailed bone level assessment |
As you can see, D0270 is the smallest bitewing code. It represents the most focused image possible.
Important Note for Readers
Do not let anyone bill you D0270 for more than one X-ray. If your dentist takes two separate bitewing images, the correct code is D0272. If they take four, it is D0274. Always check your itemized bill before paying.
How Much Does One BWX (D0270) Cost?
Cost is often the first question on a patient’s mind. The price of a single bitewing X-ray varies depending on where you live, the type of dental office, and whether you have insurance.
Average Price Without Insurance
If you do not have dental insurance, you will pay the office’s full fee. Across the United States, the typical range for D0270 is:
- Low end: $20 – $30
- Average: $35 – $50
- High end (specialist or urban area): $60 – $80
Many dental offices offer discounts for uninsured patients who pay at the time of service. It never hurts to ask.
Average Price With Insurance
If you have dental insurance, your plan usually covers bitewing X-rays at 80% to 100%. However, there are important limits.
Most dental plans cover a full set of bitewings (four films, D0274) once every 12 to 24 months. If you need a single BWX outside of that window, your insurance might pay less—or nothing at all.
Here is a realistic breakdown:
- In-network negotiated fee: $25 – $45
- Insurance pays (80%): $20 – $36
- Your copay (20%): $5 – $9
Some plans cover D0270 at 100% as a diagnostic service. Check your specific plan details.
Why the Same Code Can Have Different Prices
You might visit two different dentists on the same day and receive two different bills for D0270. That is legal and normal. Dental fees are not regulated like medical fees.
Factors that influence price:
- Geographic location (New York City costs more than rural Iowa)
- Type of practice (specialist vs. general dentist)
- Equipment used (digital X-rays vs. traditional film)
- Office overhead (rent, staff, technology)
Real Patient Example
“I needed a single bitewing to check a suspicious spot between my lower molars. My dentist in Austin, Texas charged me $42 for D0270. My insurance covered 80%, so I paid $8.40 out of pocket. The whole process took less than five minutes.” – Sarah M.
Insurance and D0270: What You Must Know
Dental insurance can be frustrating. Understanding how insurers treat D0270 will save you money and headaches.
Frequency Limitations
Almost every dental insurance plan has a frequency limitation for X-rays. For D0270, most plans consider it a “diagnostic” service. However, they often bundle it with other bitewing codes.
A common rule is:
- One set of bitewings (any combination of D0270, D0272, D0274) every 6 to 12 months.
- Some plans allow D0270 more frequently if it is for a specific problem area.
When Insurance Refuses to Pay
Insurance companies sometimes deny D0270 claims. Here are the most common reasons:
- The patient had another bitewing X-ray recently. The insurer says it is too soon.
- The dentist billed D0270 but should have used a different code. For example, a periapical X-ray (D0220) might have been more appropriate.
- The X-ray was taken for cosmetic reasons. Insurance does not cover purely cosmetic imaging.
- The provider is out of network. Your out-of-network benefits may be lower or nonexistent.
How to Appeal a Denial
If your insurance denies a claim for D0270, do not give up immediately. You can appeal. Here is a simple process:
- Ask your dentist’s office for the X-ray and the clinical notes.
- Write a short letter to your insurance company explaining why the X-ray was medically necessary.
- Include the dentist’s supporting documents.
- Send everything by certified mail (keep a copy).
Many patients win appeals because insurers deny claims automatically at first.
Important Note for Readers
Do not assume your insurance will cover D0270 just because it is a small X-ray. Always ask your dental office to verify your benefits before the appointment. A five-minute phone call can save you from a surprise bill.
D0270 vs. Other Common Dental X-Ray Codes
Patients often confuse bitewing X-rays with other types of dental images. Let us clear that up.
Periapical X-Ray (D0220 or D0230)
A periapical X-ray shows the entire tooth, from the crown to the root tip. Dentists use these to look for abscesses, root issues, or bone problems around a single tooth.
- D0220: Intraoral – periapical first film
- D0230: Intraoral – periapical each additional film
The key difference from D0270 is that a periapical includes the root. A bitewing (D0270) only shows the crowns.
Panoramic X-Ray (D0330)
A panoramic X-ray shows the entire mouth in one wide image. It includes teeth, jaws, sinuses, and temporomandibular joints.
- D0330: Panoramic film
This is not a bitewing. It is a different technology and a different code entirely. You would never use D0330 when you only need to see between two teeth.
Full Mouth Series (D0210)
A full mouth series (FMX) is a complete set of periapical and bitewing X-rays. It typically includes 14 to 20 images.
- D0210: Intraoral – complete series (including bitewings)
If your dentist takes a full mouth series, they should not bill you separately for D0270. The FMX code includes everything.
Comparison Table: Which Code for Which Need?
| Your Situation | Likely Code | Typical Cost (No Insurance) |
|---|---|---|
| Check one specific spot between two teeth | D0270 | $30 – $50 |
| Check one tooth from crown to root tip | D0220 | $30 – $50 |
| Check both sides of your back teeth (four images) | D0274 | $60 – $120 |
| Get a complete overview of all teeth and jaws | D0330 (panorex) | $100 – $150 |
| Full exam of every tooth (14+ images) | D0210 | $150 – $300 |
What to Expect During a Single Bitewing X-Ray
If you have never had a D0270 before, you might feel a little nervous. That is normal. But the procedure is quick, painless, and very simple.
Step-by-Step Process
- You sit in the dental chair. The hygienist or dentist will place a lead apron over your chest and lap.
- The sensor or film goes into your mouth. It is a small, rigid or flexible device attached to a holder.
- You bite down gently on the wing. This holds the sensor in place.
- The machine positions itself outside your cheek. It will aim directly at the sensor inside your mouth.
- You stay still for one second. The X-ray beam activates. You might hear a quiet beep.
- It is done. The sensor comes out. You can see the image on a computer screen almost instantly.
The entire process takes less than two minutes from start to finish.
Does It Hurt?
No. You might feel mild pressure from the sensor against your gums or the roof of your mouth. Some people have a sensitive gag reflex. If that is you, tell the hygienist before they start. They can use a smaller sensor or adjust the angle.
Radiation Exposure: The Honest Truth
People worry about dental X-ray radiation. That concern is understandable. But let us put it in perspective.
A single bitewing X-ray (D0270) exposes you to approximately 0.005 millisieverts (mSv) of radiation.
To give you a comparison:
- Daily background radiation (what you get from the sun, soil, and air each day): 0.008 mSv
- One cross-country flight: 0.04 mSv
- One chest X-ray: 0.1 mSv
In other words, a single BWX exposes you to less radiation than you get from living your normal life for one day. The risk is extremely low. Modern digital X-rays use even less radiation than older film-based systems.
Important Note for Readers
Pregnant patients: If you are pregnant or think you might be, tell your dentist. Routine X-rays are usually postponed until after delivery. However, a single D0270 with a lead apron is considered very low risk. Your dentist will help you make the best decision.
Why Dentists Choose D0270 Over Other Codes
You might wonder why a dentist would ever choose a single bitewing instead of taking two or four at once. There are several good reasons.
Reason 1: Follow-Up on a Known Issue
Let us say you had a small cavity between two teeth six months ago. Your dentist decided to “watch” it instead of filling it. Now it is time to check if that cavity has grown.
Taking a full set of four bitewings would expose you to unnecessary radiation and cost you extra money. One D0270 is the smart choice.
Reason 2: Limited Insurance Coverage
Not everyone has generous dental benefits. Some plans only cover one X-ray per visit. Your dentist might use D0270 to give you the most important image within your coverage limits.
Reason 3: Patient Comfort or Cooperation
Some patients have difficulty holding multiple X-ray sensors in their mouths. This includes young children, people with strong gag reflexes, or patients with certain disabilities. One quick image is easier for everyone.
Reason 4: Emergency or Acute Pain
If you walk into a dental office with sudden pain between two specific teeth, the dentist does not need to X-ray your whole mouth. A single D0270 focused on the painful area provides the answer faster and cheaper.
Quote from a Practicing Dentist
“I use D0270 at least three or four times a week. It is my go-to code when a patient comes in with a specific complaint or when I am monitoring a known problem. Patients appreciate that I am not over-treating or over-charging them.” – Dr. James R., general dentist, Ohio.
How to Read Your Dental Bill for D0270
Dental bills can look like they are written in a foreign language. Let us decode one together.
What a Good Bill Looks Like
A proper dental bill or insurance explanation of benefits (EOB) for D0270 should include:
- Procedure code: D0270
- Description: Bitewing – single film
- Tooth number(s): (Optional but helpful) For example, “teeth #18 – #19”
- Fee charged: $45.00
- Insurance allowed amount: $38.00
- Insurance paid: $30.40
- Your responsibility: $7.60
Red Flags to Watch For
Here are signs that something might be wrong on your bill:
- D0270 appears twice on the same date. Unless you had two separate single bitewings of completely different areas, this is likely a billing error.
- D0270 appears with D0274 on the same date. A full set of four bitewings includes the single views. You should not be billed for both.
- The description says “single film” but you remember taking more than one. Ask for clarification.
- The fee is over $100. Unless you are at a high-end specialist in a major city, this is unusually high.
What to Do If You See a Mistake
Do not panic. Most billing errors are honest mistakes. Here is what to do:
- Call your dental office’s billing coordinator. Be polite.
- Say: “I see code D0270 on my bill, but I wanted to confirm how many X-rays were taken.”
- If they made a mistake, they will correct it and send a new bill to your insurance.
- If they disagree, ask for a copy of your X-ray and the clinical note. Then call your insurance company.
Frequently Asked Questions (FAQ)
1. Is D0270 the same as a “checkup X-ray”?
Not exactly. A routine checkup often includes a set of four bitewings (D0274). D0270 is a single image, usually for a specific reason.
2. How often can I get D0270 covered by insurance?
Most plans allow bitewing X-rays every 6 to 12 months. However, some plans allow D0270 more frequently if it is for a diagnostic or follow-up purpose. Check your plan.
3. Can a dentist bill D0270 if they take a digital X-ray?
Yes. The code D0270 applies to both traditional film and digital X-rays. The technology does not change the code.
4. Is D0270 covered by Medicare?
Original Medicare (Part A and B) does not cover routine dental X-rays. Some Medicare Advantage plans (Part C) offer dental benefits that may cover D0270. Always verify before your appointment.
5. What is the difference between D0270 and D0272?
D0270 is one film. D0272 is two films. If your dentist takes two separate bitewing images, they should use D0272.
6. My dentist used D0270 but also charged me for “X-ray interpretation.” Is that correct?
Sometimes. Some dental offices include interpretation in the X-ray fee. Others bill separately for diagnostic imaging interpretation. Look for codes like D0999 (unspecified diagnostic procedure) or D0411. If you are unsure, ask the office to explain.
7. Can I refuse a bitewing X-ray?
Yes. You have the right to refuse any dental procedure, including X-rays. However, your dentist also has the right to decline treatment if they cannot safely diagnose without an X-ray. It is best to have an open conversation.
8. How long does a dentist keep my D0270 X-ray?
Most states require dental offices to keep X-rays for 5 to 7 years. Some keep them longer. You can request a copy for yourself or to send to a new dentist.
9. Is there a cheaper alternative to D0270?
No. There is no substitute for an X-ray if your dentist needs to see between your teeth. Skipping the X-ray could lead to undiagnosed cavities that become root canals or extractions.
10. Why was I charged for D0270 when I have insurance?
Insurance coverage is not 100% for everyone. You may have a deductible, a copay, or you may have met your annual maximum. Call your insurance company to understand your specific plan.
Additional Resource
For the most current and official dental code information, visit the American Dental Association (ADA) CDT Code webpage:
🔗 Link: www.ada.org/en/publications/cdt
This resource provides the complete, authoritative guide to all dental procedure codes. It is updated every year. Dental offices and insurance companies rely on it. You can too.
A Helpful Checklist for Your Next Dental Visit
To make sure you get the right X-ray at the right price, use this simple checklist.
Before your appointment:
- Ask the scheduler: “Will I need any X-rays today?”
- If yes, ask: “What specific codes will you be using?”
- Call your insurance or check your online portal for bitewing coverage.
- Confirm your dentist is in-network (if that matters to you).
During your appointment:
- Tell your dentist about any specific pain or concerns.
- Ask: “Is one bitewing enough, or do we need more?”
- If you are pregnant or think you might be, say so before any X-ray.
After your appointment:
- Ask for an itemized receipt before you leave.
- Check that the code on your receipt is D0270 for one film.
- Compare the fee to the average range ($30 – $50 typical).
- If something looks wrong, speak up before paying.
Common Myths About Dental Code D0270 (Busted)
Let us clear up a few misunderstandings that circulate online and in dental waiting rooms.
Myth 1: D0270 is obsolete because everyone uses digital X-rays now.
Truth: Digital X-rays use the same CDT codes as film. D0270 is still very active and widely used.
Myth 2: One bitewing is useless. You always need four.
Truth: For follow-ups, specific pain, or limited insurance, one bitewing is often the perfect choice. More is not always better.
Myth 3: D0270 is not covered by any dental insurance.
Truth: Most dental plans cover D0270. The issue is usually frequency limitations, not the code itself.
Myth 4: You can use D0270 for any single X-ray in the mouth.
Truth: D0270 is specifically for bitewing X-rays (crowns only, between teeth). For a periapical X-ray (including roots), you need D0220 or D0230.
Myth 5: If a dentist uses D0270, it means they have old equipment.
Truth: The code has nothing to do with equipment age. It describes the type and number of images, not the technology.
The Future of Dental Coding for Bitewing X-Rays
Dental coding evolves slowly. The ADA updates the CDT code set every year, but changes to well-established codes like D0270 are rare.
That said, there are a few trends to watch.
Teledentistry and Remote Coding
As more dentists offer virtual consultations, there is discussion about creating new codes for remotely ordered X-rays. For now, a dentist must order your D0270 in person or through an established patient relationship.
Artificial Intelligence in X-Ray Reading
AI software can now read bitewing X-rays and highlight potential cavities. This may eventually lead to new codes for AI-assisted interpretation. However, D0270 itself will likely remain unchanged.
Value-Based Billing
Some insurance companies are experimenting with value-based payment models. Instead of paying per X-ray, they pay a flat monthly fee for comprehensive care. In these models, codes like D0270 are still used for tracking but not for billing patients directly.
For the foreseeable future, D0270 will remain the standard code for a single bitewing X-ray.
Conclusion (Three Lines)
The dental code for one BWX is D0270, defined as “Bitewing – single film.” This code is used for focused X-rays between specific teeth, typically costing $30–$50 without insurance. Understanding D0270 helps you avoid billing errors, maximize your insurance benefits, and have more informed conversations with your dentist.
