09/04/2026
To locate an ICD-10-CM code correctly, always use a two-step process: first look up the main term in the Alphabetical Index, and then verify the code and its required level of detail in the alphanumeric Tabular List. Never code directly from the index alone.
Step 1: Search the Alphabetical Index
Find the main term (usually the condition, disease, or symptom, rather than the anatomical site or adjective).
For example, look up "Pain" for lower back pain, or "Infection" for a urinary tract infection.
Review subterms, indented lines, and non-essential modifiers that modify the main term.
Note the tentative code provided.
Step 2: Verify in the Tabular List
Locate the three-character category or full code found in the index within the chronological Tabular List (organized by chapters A00–Z99).
Check for required additional characters (4th, 5th, 6th, or 7th characters) to capture specific details like severity, episode of care, or laterality (right vs. left).
Add a placeholder "X" if a 7th character is required and the code has fewer than six characters.
Step 3: Check Instructional Notes and Guidelines
Read all active notes in the Tabular List, such as Includes, Excludes1, Excludes2, Code first, or Use additional code.
Review official chapter-specific and general reporting guidelines to ensure complete compliance.
You can check official updates or look up specific codes digitally using the CDC ICD-10-CM Browser Tool.
