Medical Coding Reference Library: Guides by Code Set

Coding Reference Library

This library organizes our coding guides by code set. Use it to find a topic fast, review before the CPC exam, or brush up on a guideline at work. Each section starts with a short orientation, then lists every related article.

145guides8categoriesFreefor students and working coders

How to use this library: Start with the code set you are working in. Each guide explains the rule, shows a coding example, and links to the official source. Always confirm codes in the current year code books before you submit a claim.

No guides match that search. Try a code, a specialty, or a shorter word.

ICD-10-CM

29 guides

ICD-10-CM codes report diagnoses and reasons for care. Accurate diagnosis coding drives medical necessity, quality reporting, and risk adjustment.

CPT

27 guides

CPT codes report the procedures and services providers perform, from office visits to surgery. Coding them correctly depends on reading the full note and the section guidelines.

Guidelines and Conventions

23 guides

The official guidelines and conventions decide how every code is assigned and sequenced. Most coding errors come from skipping them.

Modifiers

9 guides

Modifiers tell the payer that a service was altered without changing its code. Misused modifiers are among the most common causes of denials and audit findings.

HCPCS Level II

7 guides

HCPCS Level II codes report supplies, drugs, durable medical equipment, ambulance services, and other items not in CPT.

ICD-10-PCS

4 guides

ICD-10-PCS is the procedure code set for hospital inpatient stays. It is built from seven characters that describe the body system, root operation, approach, and device.

More Diagnosis and Procedure Coding Guides

13 guides

Training, Funding and Career Guides

33 guides

Beyond the code sets, these guides cover how to train, pay for training, and build your career in medical coding and EMS.

Medical Coding Training and CPC Certification

Paying for Training: WIOA Funding and Scholarships

Medical Coding Apprenticeship

EMS Apprenticeship and EMS Documentation

Coding Foundations and Career Basics

Ready to code like this for a living?

Studying for the CPC? Visit our CPC exam prep hub or see specialty coding guides. Coding Clarified’s AAPC licensed CPC program includes an internship, and you may qualify for WIOA funding in 30+ states.

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