Medical Terminology

Analogy — Medical words are like LEGO builds made from a small, reusable parts bin: once you recognize the individual bricks (a handful of prefixes, roots, and suffixes), you can recognize — and even build — thousands of different "models" (terms) without ever having seen that exact combination before. You're not memorizing every finished model; you're learning the bricks, which is a vastly smaller and more reusable set of things to know.

Why This Comes Before Everything Else

Every ICD-10-CM code, CPT code, and clinical note is built from medical terminology. Skipping this and jumping straight to coding guidelines is like learning to read code without learning the alphabet — you can memorize individual codes, but you can't decode a term you've never seen before. This is the true starting point of a medical coding career, before ICD-10-CM Fundamentals.

The Word-Building System

Medical terms are built from three parts: prefix + root + suffix. Once you know the common pieces, you can decode thousands of terms you've never explicitly studied.

hyper- / gastr / -itis
(above/excess) (stomach) (inflammation)
= "excessive inflammation of the stomach"

Common Roots (by body system)

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Common Prefixes

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Common Suffixes

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Applying This to Coding

When you encounter an unfamiliar term in a physician's note — say "nephrolithiasis" — break it down: nephr/o (kidney) + lith (stone) + -iasis (condition of) = "condition of kidney stones." This directly points you toward the correct ICD-10-CM chapter (Diseases of the Genitourinary System) even before you look up the exact code.

Try It (2 Minutes)

Without looking anything up, break down "hepatitis" the same way the "hyper-/gastr/-itis" example above was broken down:

You should land on: hepat/o (liver) + -itis (inflammation) = "inflammation of the liver." That's the whole method — one root, one suffix, looked up in tables you already have on this page.