KNOWLEDGE LIBRARY
Learn the process, topic by topic.
Start with a question. Build understanding through clear explanations and practical examples.
Billing Versus Coding
Understand the difference between medical billing and medical coding. Explore how diagnosis codes, procedure reporting and claims fit together, with introductory lessons on ICD-10-CM and other US code systems. This learning collection explains the workflow without promising a professional coding credential. Always check the applicable code-set version and official guidance before applying a code.
ICD-10-CM, ICD-10-PCS, CPT and HCPCS: know the difference
A new learner often calls every code an ICD code.
How to look up ICD-10-CM codes using the Index and Tabular List
A code search can help you locate an entry, but finding a familiar phrase is only the beginning.
ICD-10-CM conventions: exclusions, placeholders and seventh characters
Conventions are instructions embedded in the classification.
ICD-10-CM lookup practice: I10, E11.9 and R51.9
This lesson uses three familiar entries to practice a lookup method.
Coverage, medical necessity, NCCI edits and modifiers
Code validity, coverage and payment are related but separate.