A pair-matching board where every option is a modifier that gets confused with the one next to it — 76 against 77, 78 against 79, 26 against TC, 52 against 53. Link each billing situation to the modifier that actually resolves it. Clearing a board means separating rules that look nearly identical on paper.
Every code that appears here has a full reference page on this site — descriptions, inclusion terms, Excludes1/Excludes2 notes, and crosswalks. Look one up →
Study aid only — not coding, billing, legal, or medical advice. Verify every code against the current official code set and your payer’s policy before billing.
Scores are submitted by players and shown as entered. Play a round to add yours.
Give it a heart so other coders can find it, and send it to someone on your team who needs the practice.




