Healthcare organizations are navigating another round of coding updates, evolving payer requirements, and ongoing documentation and compliance expectations. With FY 2027 ICD-10-CM changes now in effect and preparations underway for the new calendar year, coding teams have plenty to keep up with.
But sometimes, the challenges identified during coding reviews have little to do with new codes.
An overlooked instructional note, an incorrect sequencing decision, or a modifier applied out of habit can affect coding accuracy even when the coder has years of experience.
Experience is valuable, but familiarity can sometimes lead us to rely on what we remember rather than revisiting the instructions that govern code assignment.
Coding conventions and guidelines still matter.
ICD-10-CM conventions and the Official Guidelines for Coding and Reporting establish the foundation for accurate diagnosis coding. Instructions such as Code first, Use additional code, Excludes1, and Excludes2 have distinct meanings that can affect code selection and sequencing.
CPT and HCPCS Level II codes also have descriptors, instructions, and reporting requirements that should be reviewed rather than assumed.
Sequencing and specificity require attention.
Selecting a diagnosis code that accurately describes a condition is only part of the process. Sequencing requirements and available specificity must also be considered.
A diagnosis may be supported but incorrectly sequenced. Documentation may also support a more specific code than the one routinely reported.
Modifiers and units deserve a second look.
Modifiers provide additional information about reported services, but their use must meet applicable requirements. Similarly, units must accurately represent the services performed and follow code-specific reporting instructions.
Even when the primary procedure code is correct, modifier or unit errors can affect claim accuracy.
Medical necessity remains essential.
Correct code selection does not automatically establish medical necessity. Documentation must support the services provided, and applicable coverage requirements must also be considered.
Understanding how coding, documentation, and medical necessity work together is essential to a complete review.
Getting back to basics is an ongoing process.
Foundational coding principles are not simply lessons from certification training. They remain relevant throughout a coding professional’s career.
This article introduces BCA’s Back to Basics series, where we’ll revisit familiar coding concepts, clarify commonly misunderstood instructions, and explore their application in everyday coding and auditing scenarios.
For organizations looking to reinforce these fundamentals, BCA, Inc. offers auditing, targeted education, and consulting to help identify recurring coding concerns, address knowledge gaps, and strengthen consistent, defendable coding practices.
Sometimes, meaningful improvements in coding accuracy begin not with learning something new, but with taking a closer look at the rules we think we already know.
Schedule a consultation with one of our experts.