How to Use CPT Code 45378 Correctly in Gastroenterology Medical Billing
Learn how to use CPT Code 45378 correctly in gastroenterology billing. Avoid denials, use right modifiers, and bill diagnostic colonoscopy with confidence.
Colonoscopy billing is a common occurrence in every gastroenterology practice. But, the claim denials for colonoscopy codes continue to be one of the most prevalent causes of lost revenue for GI practices each and every month. CPT Code 45378 is a very common code in GI practices. It is not always due to poor performance. Most of the time, it’s either a little miscommunication about when a code applies to a claim, what it’s supposed to say, or how a code, or payer rule, changed without anyone’s awareness.
At the core of this issue is 45378. This is the base code for a diagnostic colonoscopy. This article provides you with everything you need to know so you don’t end up with denied claims. We cover everything billers, coders, and practice managers need to know to avoid major mistakes.
What Is CPT Code 45378?
CPT Code 45378 is the procedure code used to bill a diagnostic colonoscopy of the entire colon. This involves the doctor passing a flexible scope at the back of the body into the rectum and then to the cecum (the opening of the large bowel). Sometimes, the scope also goes down into the last part of the small intestine (the terminal ileum). The key word in this is diagnostic. The colonoscopy (CPT Code 45378) includes the physician’s examination of the colon, with no additional procedures performed beyond colonoscopy.
No tissue is taken. No removal of polyps. No injections are given. An examination of the colon from end to end. It’s easy to remember: CPT Code 45378 is the “look only” colonoscopy code. Any extra procedure occurring during the same session will cause the code to change. This is the area that leads to the highest number of billing mistakes in the GI practice.
When Is CPT Code 45378 the Right Code to Use?
When it comes to billing, all billers, no matter how much experience they have, should take a moment to think about the CPT code 45378.
The CPT code 45378 is used when three things are true:
The colonoscopy is complete. The doctor has reached the cecum. If the scope was not inserted all the way to the cecum, then it’s a whole new ball game and that needs to be handled differently.
During the same session no further procedures were carried out. This includes biopsy, polypectomy, ablation, dilation, removal of foreign bodies or anything else beyond a visual inspection.
Proper documentation is provided to support the procedure in the medical record. A clean code without clean documentation is still a denial waiting to happen.
A Real Scenario to Make This Clear
A 50-year-old man has a routine colonoscopy. Three years ago he had a polyp removed and his gastroenterologist wants him to have one checked again. The doctor will insert the colonoscope, advance to the cecum, and then carefully inspect every part of the colon, but will not detect any polyps or abnormalities and will finish the procedure. This visit will be coded as 45378. Nothing extra happened. The Test was a full one. It will be documented as cecal intubation and a normal colon. Clean claim.
Now make one change. The same exam reveals a small polyp, which is then removed by a cold forceps technique. CPT Code 45378 is no longer the correct code. The claim is submitted under the colonoscopy, biopsy, or other more specific code as applicable, to CPT 45380. Hundreds of billing mistakes are made each month in GI practices all over the country for this one scenario alone.
Documentation Requirements for CPT Code 45378
Let us talk about documentation because this is where even experienced billers sometimes miss things. For 45378 to hold up under payer review or an audit, the operative report needs to include specific elements. Missing any one of these can lead to a denial or a take-back request.
Cecal Intubation Confirmation
The report should be able to verify that the physician has reached the cecum. This is usually recorded by a photograph of the cecal landmarks. The ileocecal valve, appendiceal opening, and transillumination of the right lower quadrant are the common sites used to verify cecal intubation. Payers may not agree to pay claims for a “complete colonoscopy” unless there is a landmark statement on the documentation. Educate your doctors or their scribes to always note this.
The Indication for the Procedure
What was the reason for this colonoscopy? That answer is the result of a diagnosis code on the claim, which impacts coverage and patient responsibility. 45378 is allowed to be used for a logical indication for a diagnostic/surveillance colonoscopy. Typical symptoms are surveillance following removal of a polyp, assessment of rectal bleeding, investigation of abdominal pain or alteration of bowel habits or having a personal history of colon cancer.
Findings Must Be Described Segment by Segment
A “normal colonoscopy” is not sufficient. The report should contain a description of the results of the examination of each section of the colon or of the failure to find anything. The following should each be stated: Cecum, ascending colon, transverse colon, descending colon, sigmoid colon and rectum.
Medications and Patient Tolerance
The use of sedation drugs and patient tolerance to the procedure should also be noted. This doesn’t have any impact on the code itself, but it adds to the clinical picture and substantiates medical necessity.
How CPT Code 45378 Compares to the Codes Around It
Trying to interpret CPT Code 45378 by itself is not sufficient. It is important to understand its place in the family of colonoscopy codes, since there is sometimes only one extra step that the physician performed during the colonoscopy.
| What Was Done | Correct Code |
|---|---|
| Diagnostic colonoscopy only | CPT 45378 |
| Colonoscopy with biopsy | CPT 45380 |
| Colonoscopy with snare polypectomy | CPT 45385 |
| Colonoscopy with hot biopsy forceps | CPT 45384 |
| Colonoscopy with submucosal injection | CPT 45381 |
| Colonoscopy with ablation of tumor | CPT 45388 |
The common principle: charge a fee for the coding of the most complex procedure. If a biopsy was performed during a diagnostic colonoscopy, then don’t report CPT Code 45378 and 45380. You charge only 45380 because this is a diagnostic examination component that is included in the charge. This is known as the “inclusive” nature of the higher-level codes and when a concept is missed, unbundling errors are picked up by the payers.
Modifiers Used With CPT Code 45378
Modifiers are important in helping to give context to a claim. If used properly, they will help ensure a proper reimbursement. Using these things the wrong way can cause problems, like delays or denials.
Modifier 53: Discontinued Procedure
If the physician begins the colonoscopy but stops it before they get to the cecum for a reason, such as the bowel preparation is not good enough or the patient is uncomfortable Modifier 53 is added to 45378. The physician has to add Modifier 53 to 45378 in this situation. The colonoscopy is stopped early so Modifier 53 is used. This will indicate to the payer that the procedure has been initiated but has not been performed because of a clinical determination, not because of an attempted scope reduction.
Note: Modifier 53 has a major impact on reimbursement. Payers will usually pay a lower rate for discontinued procedures and some will want to see a note/signed document detailing the reasons for the procedure being discontinued.
Modifier 52: Reduced Services
Modifier 52 would be used if the procedure was performed, but less intensely than described. Modifier code 45378 is used much less often than Modifier 53, however. Take care when using it, and check with the particular payer.
Modifier 59: Distinct Procedural Service
45378 may be used with a modifier (Modifier 59) with other CPT codes when the two CPT codes are performed on the same date of service. This situation is less common with colonoscopy billing but can happen in complicated situations.
The Screening Colonoscopy Modifier Situation
This is a specific situation which is very common in GI billing. Someone visits the doctor for a “check-up colonoscopy. The doctor takes a look and doesn’t find anything. In this instance, many practices charge a screening diagnosis code with CPT Code 45378. If the patient’s insurance plan called for a modifier to insure the patient against cost-sharing of preventive care, and that modifier is not included, however, the patient may end up with an unexpected bill. Understand your payers’ rules. Some plans have Modifier 33 for preventative services to alter cost sharing.
Reimbursement and RVU Value of CPT Code 45378
45378 reimburses in a facility setting at about $230-$270 per Medicare claim in 2024. It is very high, as the practice is absorbing overheads, and hence this is the non-facility rate. The numbers differ according to geographical area based on geographic practice cost index. The commercial payer rates for CPT Code 45378 are quite variable. A few payers adhere to Medicare rates. Others have negotiated rates, considerably different.
If you have been receiving regular underpayments on its claims, retrieve your EOBs and compare the claims with your contracted fee schedule. Very often, people don’t check and there are underpayments that go unchallenged. A great little suggestion: If your practices are high, create a payment variance report, just for this code. If you are getting paid twenty dollars less for each claim and you have two hundred of these claims every month then you are losing four thousand dollars in revenue that you probably do not realize you are missing out on.
Medicare-Specific Rules That Affect CPT Code 45378
Medicare billing for colonoscopy has some rules that’re unique and important to understand about Medicare billing, for colonoscopy.
The Screening to Diagnostic Conversion
Preventive colonoscopies are paid at 100 percent and usually don’t require the Medicare patient to pay anything for their routine screening exam. However, if the physician discovers, and removes, a polyp or performs any interventional procedure during that preventive visit, the purpose of the visit becomes screening to diagnostic or to therapeutic. From that time, the code becomes the screening colonoscopy code and switches to CPT Code 45378 or a higher procedure code if anything was performed. And the patient’s cost-sharing begins.
One of the most confusing scenarios for patients and a potential cause for billing conflicts if practices don’t make this clear from the get-go. Patients should always be told prior to the procedure that if something is discovered and treated during the exam, their cost sharing may be impacted.
Frequency Limitations
Medicare will pay for screening colonoscopies at certain intervals depending on the patient’s risk. For average-risk patients, coverage is every 10 years. Coverage for high risk: every 2 years. If the diagnostic colonoscopy is performed outside of these time periods it should have a well-documented medical indication. If not, the claim might be denied.
Common 45378 Billing Errors That Lead to Denials
Using information from the GI billing teams, here’s a list of the most common errors that come across their desks frequently with 45378 CPT Code .
Billing CPT Code 45378 When a Biopsy Was Taken
This is the first mistake made. The doctor took a small sample of tissue for examination. Coder observes a “colonoscopy” and automatically pulls the code 45378. The correct code was 45380. The difference is lost by the practice, since the payer pays the lower amount, or denies the claim.
Fix: Ensure the coder reads the whole operative report and not just the procedure header. The biopsy/polypectomy may be referred to in the middle of the report.
Missing Cecal Documentation Leading to Downcoding
Some payers may downcode to a partial colonoscopy or sigmoidoscopy if the physician’s report does not contain confirmation of cecal intubation (which would be reimbursed at a much lower rate).
Fix: Develop a checklist for documentation for your GI physicians. All colonoscopy reports should be accompanied by the confirmation of cecal landmarks prior to the note being signed.
Wrong Diagnosis Code Paired With CPT code 45378
If you don’t provide a diagnosis code that backs the reason for the colonoscopy, the code will be denied. For instance, if a patient has abdominal pain as the diagnosis and the procedure is for routine surveillance, there is a mismatch that is easy to detect by a payer.
Fix: The coder should verify that the diagnosis code is correct, that is, the coder should review the diagnosis code to be sure that it is the same code the physician is documenting; not only the patient’s problem list.
Unbundling
When billing CPT Code 45378 with 45380 or 45385 on the same claim, it is considered unbundling. The higher code already includes everything in CPT Code 45378. When both bills are submitted separately, they are automatically edited and denied.
A Quick Reference Summary for Daily Use
If you want a quick reference in your workflow, here is a quick rundown of when to use CPT Code 45378 and when you don’t! If the colonoscopy was completed, the cecum was reached, no additional procedures were performed, and there is documentation to support all of the above, then use CPT Code 45378. CPT Code 45378 should not be used in the presence of a biopsy specimen, removal of polyp, or injection or ablation performed or when the cecum is not accessed and the procedure is incomplete.
Final Thoughts From Billing Care Solutions
The 45378 is not a complex code by itself. The problem with billing is that there are a lot of things to consider like the paperwork that needs to be done, the rules that have to be followed the codes that have to be used the insurance companies that have different rules the special codes called modifiers and the medical issues that can change from one patient visit to another.
The people who do a job of billing with the CPT code 45378 are the ones who take the time to read the whole report, from the doctor the doctors who know what they need to write down and the office staff who regularly check to see why some bills are not being paid so they can find a pattern and fix the problem early on with the CPT code 45378.
We work with gastroenterology practices to develop the right system for them at Billing Care Solutions. Contact us if your team is facing frequent denial of colonoscopy claims, under payment you can’t track or comply with this code. We know the process of GI bill and we are here to help you receive all your practice earnings.
