CPT Code for Hemoglobin A1C? Everything You Need to Know About Accurate Billing

If you are in medical billing, run a diabetes care clinic, or simply want to understand how to bill for Hemoglobin A1C tests, you have come to the right place. Proper CPT coding of A1C tests is not just important to medical billing and insurance processing; it can literally make or break the financial success of your medical practice.

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In this article, we will delve into all aspects of A1C tests and medical billing, including what CPT codes to use, what documentation is necessary, common reasons why A1C tests are denied, and how artificial intelligence and speed processing are revolutionizing the process.

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What Is Hemoglobin A1C and Why Does It Matter for Billing?

Hemoglobin A1C is a test that gives information about the level of glucose in the blood on an average basis over the past two to three months. It is one of the most requested tests in the US healthcare system, particularly for patients with Type 1 and Type 2 diabetes. It is a mission-critical process in revenue cycle management because of its volume and its status as a reimbursable test.

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From a clinical perspective, it is relatively simple to order a test for Hemoglobin A1C because it only requires a blood sample and does not require fasting. However, from a reimbursement perspective, it is a bit complex because of multiple codes and documentation requirements.

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The Core CPT Codes for Hemoglobin A1C

The Current Procedural Terminology (CPT) code list, which the American Medical Association administers, has two major codes for A1C testing:

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CPT 83036 - The Standard A1C Code

CPT 83036 is the standard code for most A1C tests in clinical laboratory settings, such as hospital labs, reference labs, and physician office labs (POLs). The test has to be performed using a CLIA-approved quantitative A1C test methodology.

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Important Facts about 83036:

• Any quantitative A1C test methodology, such as HPLC, immunoassay, and enzymatic, is included.
• The code is billable to the laboratory entity, not necessarily the provider.
• Medicare Part B covers this code twice a year for diabetic patients without additional symptoms and quarterly for patients whose treatment has changed or who are not meeting their treatment goals.
• Medicaid coverage varies by state, but verification is necessary in any case.

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CPT 83037 - Point of Care and Home Monitoring

CPT 83037 is particularly applicable when the A1C test is performed using an FDA-cleared home or point-of-care monitoring device. Devices can include those at the patient's bedside, in a rural clinic, or even at the patient's home using a kit.

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Important Facts about 83037:

• The device must have FDA clearance for home or point-of-care use.
• Do not use this code if a standard laboratory device is used, even in a small office.
• Please check the fee schedules, as some payers may allow 83037 to be reimbursed at a reduced rate compared to 83036.
• Please ensure that the name or model of the device is included.

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ICD-10 Diagnosis Codes Paired with A1C Testing

It is important to remember that CPT codes are not used without a valid ICD-10-CM diagnosis code to justify the medical necessity of the procedure. The following are some of the most commonly used ICD-10 diagnosis codes with A1C tests:

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It is always important to code to the highest level of specificity possible. If complications of diabetes are present, such as neuropathy and/or nephropathy, these should also be coded, even though they are not necessary for A1C testing reimbursement.

Modifiers That Affect A1C Claims

There are different CPT modifiers, and they can be applicable for A1C testing under different circumstances. 

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Common Denial Reasons and How to Prevent Them

Revenue cycle professionals across the United States report similar patterns of claim denials for A1C testing services. Understanding these patterns is the first step towards reducing your denial rates.

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The Role of Artificial Intelligence in A1C Billing

Artificial intelligence is not a futuristic concept for healthcare billing and revenue cycle management. We are already witnessing its application across different platforms for RCM. For A1C testing and other high-volume lab testing services, artificial intelligence is changing the way claims are prepared and processed. AI platforms like RapidClaims help to navigate the process of A1C billing with the use of their advanced AI tools and software.

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AI-Powered Code Suggestion and Validation

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Artificial intelligence-based coding solutions use clinical documentation, including physician notes, lab orders, and problem lists, and suggest the most suitable CPT and ICD-10 combinations for a claim. For A1C testing services, it can:

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• Differentiate between CPT 83036 and 83037 based on the information available in the lab orders and EHR.
• Suggest situations where the testing frequency for A1C testing might exceed the eligibility criteria for payers.

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How RapidClaims Reduces A1C Denials

• Cross-verifies patient A1C test history against payer policies for frequency of testing before billing
• Auto-populates CLIA numbers, NPI information, and modifier information from internal sources
• Indicates missing ABN documentation for Medicare patients who exceed coverage limits
• Estimates the likelihood of denial for each claim and sends those with higher risk for human review
• Continuously learns from denial patterns to increase the accuracy of future coding efforts

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Billing for A1C tests may not seem like a very complex area, but as this process is repeated for thousands of patients and dozens of payers, even small efficiencies in terms of coding and speed can add up to substantial revenue recoveries and operational efficiencies. As these technologies become more and more integral to the billing process, those practices that invest in these technologies will be able to better navigate this complex reimbursement environment.

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FAQs

What is the CPT code for Hemoglobin A1C?

The main CPT code for a standard laboratory test is 83036, and if the test is performed on an FDA-approved home or point-of-care device, then the CPT code is 83037.
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What is the main difference between CPT 83036 and CPT 83037?

CPT 83036 is for laboratory testing, and CPT 83037 is for tests performed on an FDA-approved home or point-of-care monitoring device.

What is the ICD-10 code that is used with the CPT Code for the hemoglobin A1C test?

The ICD-10 codes that are usually used in conjunction with the CPT codes are E11.9, E10.9, and R73.09, and the correct ICD-10 code depends on the confirmed diagnosis and reason for the test.