Common Mistake done by Medical Coder
Accurate medical coding requires more than simply matching a diagnosis with an ICD-10-CM code. A coder must review the medical record carefully, follow the official coding guidelines, and make sure the selected code is supported by the provider’s documentation.
Even a small mistake can affect claim accuracy, reimbursement, and compliance. Let’s look at some common ICD-10-CM coding errors and understand how to avoid them.
1. Ignoring Excludes1 and Excludes2 Notes
Excludes notes provide important instructions about whether two conditions can be coded together.
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Excludes1: Generally means the excluded condition should not be coded with the code above the note because the two conditions should not occur together in the specified coding context. There are limited exceptions, such as when the conditions are unrelated.
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Excludes2: Means the excluded condition is not included in the code above the note. Both conditions may be reported when the patient has both.
Medycoding Tips to avoid this mistake : Always review the Excludes notes in the Tabular List before finalizing the codes.
2.Missing an Applicable Combination Code
A common ICD-10-CM coding mistake is assigning separate codes for two or more related conditions when a single combination code is available and appropriate.
A combination code represents two diagnoses, a diagnosis with an associated manifestation, or a diagnosis with an associated complication in one code. Using separate codes without checking for an applicable combination code can result in inaccurate or incomplete coding.
Example: A patient is diagnosed with type 2 diabetes mellitus and diabetic chronic kidney disease. The coder assigns a code for diabetes and another code for chronic kidney disease but overlooks the applicable combination code, E11.22 (Type 2 diabetes mellitus with diabetic chronic kidney disease).
Depending on the documentation and applicable coding instructions, an additional code from category N18.- may also be required to identify the stage of chronic kidney disease.
Medycoding Tips to avoid this mistake: Always check the Alphabetic Index and Tabular List for an applicable combination code. Follow all “Use additional code” and “Code first” instructions, and assign additional codes when required to provide complete information about the patient's condition.
3. Using a Congenital Code for an Acquired Condition
Congenital conditions are present from birth, whereas acquired conditions develop after birth. Selecting a congenital code for an acquired condition can misrepresent the patient's diagnosis.
Example: A patient develops a condition following surgery, but the coder mistakenly assigns a code for a congenital abnormality instead of the appropriate acquired condition.
Medycoding Tips to avoid this mistake: Confirm whether the condition is congenital or acquired from the provider’s documentation and select the code that accurately represents the diagnosis. If the patient is of young age , consider congenital if documentation not availabe for older age consider acuqired.
4. Assigning a Code Without Following the Alphabetic Index and Tabular List
Another common mistake is selecting an ICD-10-CM code directly from a search engine, coding website, or personal memory without verifying it in the official coding resources.
The Alphabetic Index helps locate a potential code, while the Tabular List provides the code details, inclusion terms, Excludes notes, and other instructions.
Medycoding Tips to avoid this mistake: Always begin with the Alphabetic Index and verify the selected code in the Tabular List. Review all applicable instructional notes before reporting the code.
5. Coding Unconfirmed Diagnoses in the Wrong Setting
Coders sometimes assign codes for diagnoses documented as probable, suspected, questionable, consistent with, or rule out without considering the applicable coding guidelines.
For example, an outpatient provider documents “rule out pneumonia.” In an outpatient setting, the uncertain diagnosis is generally not coded as if pneumonia were confirmed. Instead, code the symptoms, signs, or other established reason for the encounter, as appropriate.
In certain inpatient hospital settings, qualifying uncertain diagnoses documented at discharge may be coded as if they existed, according to the applicable official guidelines.
Medycoding Tips to avoid this mistake: Identify the care setting and follow the relevant inpatient or outpatient rules before assigning a code for an uncertain diagnosis.
6. Missing an External Cause of Injury Code
When a patient is treated for an injury, the coder may focus on the injury itself and overlook relevant details about how it occurred.
Example: A patient sustains a fracture after falling from a ladder. The coder reports the fracture code but overlooks the applicable external cause code when required or relevant to the reporting circumstances.
External cause codes can describe the mechanism, intent, place, activity, and other circumstances of an injury.
Medycoding Tips to avoid this mistake: Review the documentation for the circumstances of the injury and apply the relevant external cause coding guidelines and reporting requirements.
7. Making a Sequencing Error
Correct code selection is only part of accurate coding. The codes must also be sequenced according to the applicable guidelines and instructional notes.
Example: A patient is admitted for treatment of a condition caused by an underlying disease. The coder reports the secondary condition first even though a specific coding convention or guideline requires the underlying disease to be sequenced first.
Medycoding Tips to avoid this mistake: Review the official guidelines, “Code first” notes, “Use additional code” notes, and other sequencing instructions before finalizing the claim. The correct sequence depends on the specific circumstances and applicable rules.
8. Reporting Every Chronic Condition Without Evaluating Its Relevance
A patient’s medical record may contain a long list of chronic conditions. However, a coder should not automatically report every condition in the patient's history for every encounter.
Example: A patient visits a clinic for an acute skin infection. The medical record also lists hypertension, osteoarthritis, and a previous respiratory condition. The coder reports all three chronic conditions without checking whether they were evaluated, treated, monitored, or otherwise affected the encounter.
Medycoding Tips to avoid this mistake: Review the documentation and applicable reporting guidelines to determine which conditions are reportable. Consider whether each condition affected patient care during the encounter. Do not assume that every historical or chronic diagnosis belongs on every claim.
9. Missing or Incorrectly Coding Long-Term Medication Use
Long-term medication use can be relevant to accurate coding, but coders sometimes overlook applicable status codes or assign them incorrectly.
Example: A patient takes insulin on a long-term basis for diabetes. The coder reports the diabetes diagnosis but overlooks the applicable long-term insulin-use code when it is required and supported by the documentation.
Medycoding Tips to avoid this mistake: Review the medication history, provider documentation, and applicable guidelines to determine whether a long-term medication-use code is appropriate. Do not assign a medication-status code solely because a medication appears on the list; verify the relevant coding requirements.
10. Assigning an ICD-10-CM Code That Does Not Match the Documentation
Choosing a code based on assumptions rather than the provider’s documented diagnosis is a significant coding error.
Example: The provider documents a left-sided condition, but the coder selects the right-sided code. Alternatively, the coder assigns a more severe diagnosis that the documentation does not establish.
Medycoding Tips to avoid this mistake: Verify the diagnosis, anatomical site, laterality, severity, and other required details. If essential information is missing or conflicting, follow the appropriate query process rather than making assumptions.
11. Using an Unspecified Code When a More Specific Code Is Supported
An unspecified code may be appropriate when the documentation does not provide enough detail for a more specific code. However, using it when the medical record supports greater specificity can reduce coding accuracy.
Example: The provider documents a condition affecting the right knee, but the coder selects an unspecified-site code even though a more specific right-knee code is available and supported.
Medycoding Tips to avoid this mistake: Review the full documentation and the available code options. Assign the most specific code supported by the record, but never add details that the provider did not document.
12. Coding With Insufficient Documentation
Sometimes, the medical record does not contain enough information to support the code selected by the coder. Important details such as the exact diagnosis, anatomical location, laterality, stage, severity, or encounter details may be missing.
Example: A provider documents a pressure ulcer but does not specify its stage or use a clinical term that can be indexed to a particular stage. The coder independently determines the stage from the wound description and assigns a stage-specific code.
Medycoding Tips to avoid this mistake: Follow the applicable ICD-10-CM guidelines and Index instructions. When the documentation does not support a code or required specificity, seek clarification from the provider when appropriate.
13. Coding Signs and Symptoms Along With an Underlying Condition
A common mistake is reporting symptoms separately when they are routinely associated with a confirmed diagnosis and are not separately reportable under the coding guidelines.
Example: A patient is diagnosed with a confirmed urinary tract infection and has painful urination. If the symptom is routinely associated with the confirmed condition and no guideline or documentation supports separate reporting, reporting both codes may be unnecessary.
Medycoding Tips to avoid this mistake: Check whether the symptom is integral to the confirmed diagnosis. Do not automatically code every symptom documented in the medical record.
Other tips to avoid the error
Read each line carefully and focus.
Check the popup warning showing in 3M.
For Chronic condition, check the medication.