Read codes with the right context
Your learning sequence
Follow these lessons in order. Only available lessons are shown.
- 01ICD-10-CM, ICD-10-PCS, CPT and HCPCS: know the difference
- 02How to look up ICD-10-CM codes using the Index and Tabular List
- 03ICD-10-CM conventions: exclusions, placeholders and seventh characters
- 04ICD-10-CM lookup practice: I10, E11.9 and R51.9
- 05Coverage, medical necessity, NCCI edits and modifiers
Sources & editorial notes
Original AI-assisted educational content · Source check: 2026-09-23. No human expert review is claimed. Verify current payer and code-set instructions before real-world use.