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What are the Correct Modifiers for CPT Code 87188? A Comprehensive Guide for Medical Coders

Medical coding is an essential part of healthcare, ensuring accurate billing and reimbursement for medical services. CPT codes are proprietary codes owned by the American Medical Association (AMA) and play a critical role in this process. Specifically, CPT codes represent a standardized system of medical procedures and services. To correctly bill for these services, medical coders must adhere to the AMA’s guidelines. Failure to do so can have legal repercussions.

This article will explore the use of CPT code 87188, "Susceptibility studies, antimicrobial agent; macrobroth dilution method, each agent," and its related modifiers. We’ll also explore common use cases, so you can apply this knowledge to your coding in various specialties. It's crucial to remember this article is for informational purposes only. Use the latest CPT code manuals directly provided by AMA to ensure you are always using the current versions for accurate billing.

Understanding the Importance of Modifiers in Medical Coding

CPT code 87188 signifies a specific laboratory test measuring the susceptibility of an isolated bacteria strain to various antibiotics. Modifiers, represented by two-digit alphanumeric characters, further specify the circumstances or circumstances of the procedure being coded. In essence, they provide additional information for billing purposes. Let’s look at the following modifiers to learn how they add essential context to code 87188.

Remember, these modifiers can also be used for other CPT codes to better clarify the circumstances of a particular procedure, as they are not solely restricted to code 87188.

Modifier 59: Distinct Procedural Service

Modifier 59 designates a "Distinct Procedural Service." This means the procedure being coded is separate and distinct from other procedures performed on the same date. Let's illustrate this with a case study.

Use Case 1: The Case of the Complicated UTI

Imagine a patient presenting to their doctor with symptoms of a urinary tract infection (UTI). The doctor orders a urine culture to identify the causative organism. The laboratory isolates Escherichia coli (E. coli) and reports it to the physician. After a follow-up visit, the doctor orders additional antibiotic susceptibility testing using the macrobroth dilution method, also known as the Minimum Inhibitory Concentration (MIC) method. Because this lab test is conducted separately from the initial urine culture, you would report code 87188 with modifier 59 to indicate the test is considered a distinct service.

Here are some key questions to consider when applying Modifier 59:

Was this lab test performed at a different time from any other procedures conducted on the same date?
Did the lab test necessitate separate patient contact, a distinct sample, or a separate facility for analysis?
If this lab test was performed on the same sample, is the lab testing method different from any other testing procedures for the same patient?

If the answer to any of these questions is "yes," modifier 59 may be applicable for this situation.

Modifier 90: Reference Laboratory Services

Modifier 90 is used to report "Reference Laboratory Services," indicating the test was performed by an external laboratory (i.e. a reference lab). Think of it this way: Your physician might need specialized equipment or expertise, which may not be available at their local facility. They can outsource these specialized services to an independent reference laboratory.

Use Case 2: Finding the Cause of a Relapsing Infection

Imagine a patient has chronic recurrent pneumonia. The physician wants to rule out rare bacterial species. Because the patient’s local laboratory lacks the capabilities to run these complex diagnostic tests, the physician decides to utilize a reference laboratory. In this scenario, code 87188 should be reported with Modifier 90 to accurately reflect the billing situation.

Key points to remember about modifier 90:

The physician who orders the test is responsible for patient care.
The Reference laboratory is responsible for processing the specimen and generating the report.

Note that Medicare and commercial insurance may have specific rules and regulations regarding Reference lab services, so it’s imperative for medical coders to research those for accurate billing and claims processing.

Modifier 91: Repeat Laboratory Test on Same Day

Modifier 91 signifies that the laboratory test has been repeated on the same date of service. Think of it like this: A patient arrives at their healthcare provider’s office. Their physician orders multiple blood tests. In order to properly bill for these separate laboratory procedures on the same day, a modifier would need to be used for each individual lab test. The modifier 91 indicates that a particular test is a repeat test. This means that an earlier iteration of this specific test was already completed, and the healthcare provider, through the physician, has requested it again on the same day. For instance, a second CBC (complete blood count) in addition to other tests.

Use Case 3: The Case of a Difficult Diagnosis

Imagine a patient goes to a clinic to evaluate a suspected allergic reaction. After the initial tests are performed, the provider wants a more detailed blood panel (including allergy testing). The blood is collected during the same clinic visit and sent to a reference laboratory. They send the sample off to a laboratory to test a range of allergens to pinpoint a specific culprit. To bill for this repeat lab test on the same day, Modifier 91 would be appended to code 87188.

Modifier 91 clarifies for insurance companies that the service is distinct from other lab tests conducted on the same date, so the billing process reflects the additional work done.

Keep in mind: There is an overlap with modifiers 59 and 91, which is important to understand! When reporting these tests, you will need to decide whether modifier 59, modifier 91, or both should be included in your bill. Use your clinical judgment when coding, based on what actually occurred.

Modifier 91 is commonly used when laboratory tests are repeated in the following situations:

Monitoring for treatment response
Verifying initial findings
Conducting serial laboratory testing.

A Comprehensive Understanding of CPT Codes and Their Modifiers is Vital

Using accurate modifiers is essential for ethical and accurate billing and reporting. This also reflects your commitment to best practices within medical coding.

This article only serves as a general overview. There are many additional CPT codes and their associated modifiers. To accurately apply modifiers, medical coders must refer to the latest CPT code manual directly from the AMA website for current regulations and changes to ensure adherence to ethical, accurate and legally correct billing procedures. Using outdated versions or inaccurate code assignments can lead to legal repercussions, including hefty fines.

Learn how to correctly use CPT code 87188, "Susceptibility studies, antimicrobial agent," with modifiers like 59, 90, and 91. This guide explains how AI and automation can help with medical coding accuracy, reducing errors and maximizing reimbursements. Discover how to use AI for claims processing and improve billing workflows.

What Are the Correct Modifiers for CPT Code 87188? A Guide for Medical Coders