When considering a patient’s chart, every detail matters. It’s not just about the diagnosis, it’s the whole picture – missing something could affect the quality of care your patient receives. By now, it’s clear to most HCPs that accurate Hierarchical Condition Category (HCC) coding goes beyond paperwork alone. Accurate coding helps to deliver quality care for your patients while maintaining the financial stability of your practice.
The problem? It’s all too easy to get it wrong, and even minor coding errors can have serious consequences. These mistakes might result in financial penalties, inaccurate funding, and most importantly, compromised patient care.
Let’s consider eight of the most common HCC coding errors, and how we can avoid them. But first, the basics: what exactly is HCC coding, and why is it important?
What Is HCC Coding and Why Should You Care?
Imagine the following scenario: A 65-year-old patient with diabetes, hypertension, and chronic kidney disease (stage 3a) walks into your practice. Properly documenting all relevant conditions ensures that the appropriate HCC codes are assigned, which in turn helps forecast the healthcare resources needed for this patient’s care.
When clinicians or their coders enter the patient’s conditions into their EMR system, they select the appropriate ICD-10 codes, and the system maps the corresponding HCC codes based on this documentation.
For example:
- Chronic Kidney Disease (Stage 3a): Documenting this as N18.31 under ICD-10 will see the condition mapped to HCC 329.
- Diabetes with Chronic Complications: Entering E11.22 for diabetes with chronic kidney disease maps to HCC 37.
- Hypertension: Hypertension does not map to a specific HCC code in this instance.
Focusing on maintaining accurate patient records will ensure the appropriate HCC codes are credited, resulting in proper care and resource allocation.
Introduced by the Centers for Medicare & Medicaid Services (CMS) in 2004, HCC coding uses these codes and factors like age and gender to calculate risk. Documenting HCC codes generates a Risk Adjustment Factor (RAF) score, which helps predict healthcare costs and ensures accurate reimbursement. The higher the RAF score, the more resources should be used for the patient’s care. Essentially, these scores allow insurance companies to predict healthcare costs.
A patient with minimal health issues will typically have average healthcare costs. In contrast, a patient with multiple chronic conditions – like the 65-year-old we mentioned earlier – will require more intensive care, leading to higher costs.
We understand that HCC coding can feel like just another item on a neverending administrative checklist. But the HCC model provides a full picture of a patient’s health, ensuring they get the right care. More accurate coding means a more appropriate allocation of resources for your patient, which boosts their chances of recovery and leads to a better quality of life.
But even with the best intentions, mistakes can happen. So let’s consider the eight most common HCC coding errors, and what we can do to avoid them.
8 Common HCC Coding Errors (and How to Address Them)
By identifying the following mistakes and implementing proactive solutions like continuous HCC education, you can minimize errors and ensure your patients continue to receive the necessary care.
1) Failing to Code the Specifics
The more specific the diagnosis, the better. Failing to code with sufficient specificity can lead to missed opportunities for proper risk adjustment and reimbursement.
For example, a diabetes diagnosis can be grouped into three categories within the HCC model. Recording whether the patient has Diabetes with Chronic Complications, Diabetes with Severe Acute Complications, or Diabetes with Glycemic, Unspecified, or No Complications determines the accuracy of that patient’s health status. So the more specific you can be with your documentation, the better.
How to Address It: Use the most specific code available, conduct comprehensive reviews to capture all relevant diagnoses, and follow coding guidelines for appropriately use of combination codes. Train your team to always code to the highest level of specificity
2) Lacking Documentation
When documentation is vague or missing, coders have to guess – and that’s where errors occur. Whether it’s an unclear diagnosis or missing information on a chronic condition, incomplete documentation inevitably leads to HCC coding errors.
How to Address it: Make it a habit of documenting every condition thoroughly and specifically. Think of it as telling the whole story, not just the headline. Use templates or checklists so nothing is left out. If you’re confused about the correct codes, the CMS website is the most comprehensive resource for HCC codes.
3) Coding Chronic Conditions as Acute
Misclassifying chronic conditions as acute can lead to inaccurate risk profiles, misaligned care plans, and incorrect reimbursement. For example, for conditions such as hepatitis, acute and chronic codes reflect different levels of complexity in patient care.
Acute Hepatitis C (IB17.10) does not risk adjust, while Chronic Hepatitis C ( B18.2, HCC 27) requires ongoing management and does impact risk adjustment. This distinction highlights how even the same condition, if documented incorrectly, can significantly impact resource planning and patient care.
How to Address it: Thoroughly review the patient’s medical history to accurately differentiate between chronic and acute conditions. Identify and code chronic conditions appropriately, reflecting the patient’s long-term health status.
4) Missing Annual HCC Codes
Clinicians must code chronic conditions every year. Missing these codes can impact patient care and reimbursement – so don’t let them slip through the cracks.
As of January 1st, 2025, HCC v28 is the only active model, and there are changes you need to be aware of. For example, acute, chronic, and acute chronic heart failure have been separated into three distinct HCCs, meaning that appropriately documenting the chronicity of heart failure can significantly impact reimbursement.
Additionally, only vascular disease with rest pain now risk adjusts, and sarcoidosis of the skin has been added as a new HCC – reflecting the ongoing refinements in the model to capture more specific conditions.
How to Address it: Set up an annual review for chronic conditions so all diagnoses are up to date with the latest HCC guidelines. Think of it as a health check of your documentation.
5) Using Default Codes Unnecessarily
Unnecessarily using default codes can result in a vague or inaccurate representation of a patient’s condition, impacting care and reimbursement. Default codes should only be used when no other diagnosis is available.
For example, documenting diabetes without complication (E11.9 – Type 2 diabetes mellitus without complications) when the patient actually has diabetes with peripheral angiopathy (E11.51 – Type 2 diabetes mellitus with diabetic peripheral angiopathy without gangrene) can lead to underrepresentation of the patient’s health status.
Similarly, conditions like heart failure or chronic kidney disease should be properly documented to reflect their chronic nature and stage, ensuring the correct HCC is applied. This can significantly affect care management and financial reimbursement.
How to Address it: Only use default codes when you have to, and ensure the documentation supports it. Always look for the most specific code that reflects the patient’s condition, and perform regular audits.
6) Over- or Undercoding
Overcoding (sometimes called upcoding) can exaggerate a patient’s condition, and undercoding can undersell it. Both can have severe consequences including failed audits, financial penalties, and inaccurate care plans.
Overcoding may occur if a clinician accidentally documents diabetes with hyperosmolarity (E11.00), which maps to HCC 36: Diabetes with Severe Acute Complications, instead of diabetes with hyperglycemia (E11.65), which maps to HCC 38: Diabetes with No Complications. This would result in overestimating the severity of the patient’s condition, and lead to higher reimbursement than is appropriate.
An example of undercoding would be documenting major depressive disorder, single episode, mild, (F32.0), which does not map to an HCC, instead of major depressive disorder, single episode, moderate (F32.1), which maps to HCC 155. This would underrepresent the severity of the patient’s condition, and result in insufficient care planning and reimbursement.
How to Address it: Perform regular audits to catch and correct over- or undercoding, provide feedback to coders to prevent it from becoming habitual, and ensure documented codes reflect the patient’s condition without exaggeration or omission.
7) Outdated Coding Practices
Guidelines change, and what worked last year may not work this year. Keeping up with coding best practices can seem overwhelming, but it’s necessary for continued compliance and accuracy. For example, updates to HCC coding have seen N18.3 Chronic Kidney Disease become invalid, and be replaced by more specific codes such as N18.30 (CKD Unspecified), N18.31 (CKD Stage 3a), and N18.32 (CKD Stage 3b).
If you’re using outdated codes, it can lead to compliance issues, denied claims, or underpayment. Staying up to date with the latest codes – such as those added for obesity class 1, 2, or 3 – is essential to ensure accurate documentation and proper reimbursement.
How to Address It: You can address this common HCC coding error by regularly reviewing coding guidelines from authoritative sources like CMS, conducting routine audits to catch and correct any coding errors, and keeping your team updated with ongoing training sessions on the latest industry changes.
8) Failing to Capture Patient Histories, and Overlooking Secondary Diagnoses
Patient histories and secondary diagnoses play a vital role in accurate HCC coding. Omitting significant historical conditions or missing additional diagnoses can result in incomplete coding and misrepresent the patient’s overall health status.
For example, a patient with Type 2 Diabetes with Chronic Complications (HCC 37) and Chronic Kidney Disease Stage 4 (HCC 327) must have both conditions documented accurately. Instead of simply stating, ‘patient has diabetes,’ the documentation should read, ‘patient has Type 2 diabetes mellitus with chronic kidney disease stage 4, with ongoing treatment for both conditions,’ to capture the full complexity of the patient’s health.
Additionally, it’s essential to document status codes that still impact risk adjustment. For instance, if a patient has Type 2 Diabetes with Chronic Complications but has a history of a kidney transplant, documenting the status of the transplant ensures that the risk adjustment reflects the more complex medical situation, rather than the underlying condition alone.
Proper documentation of current AND historical conditions is essential for accurate coding and reimbursement.
How to Address It: Conduct thorough record reviews to capture all relevant diagnoses, including secondary conditions and significant patient histories. Ensure the coding reflects the patient’s complete health profile – not just the primary diagnosis.
Using Technology to Address Common HCC Coding Errors
Addressing the most common HCC coding errors requires care, diligence, and a rigorous, repeatable process. But having the right tools and support in place can also ensure that these common errors never happen again.
DoctusTech offers tools to support the HCC coding process – both by integrating directly into major EMRs to ensure documentation specificity and reduce coder dependency, and by providing HCC training that fits seamlessly into HCPs’ workflows. This combination of technologies improves overall efficiency, enhances compliance with the latest guidelines, and keeps clinical and non-clinical teams up to date without time-consuming traditional training methods.
Instead of sitting through long lectures or deciphering coder feedback, users get five minutes of app-based, asynchronous learning that fits seamlessly into their workflows. The result? A 30% increase in RAF accuracy, and 90% engagement from clinicians. And at the point of care, our HCC Patient Diagnosis Assist Platform integrates directly with more than 70 major EMRs, automating chart reviews and ensuring documentation integrity.
If you’re looking to reduce common HCC coding errors like those listed above, schedule a demo with DoctusTech today.