ICD-10-CM Alphabetic Indices
The four official alphabetic lookups behind the tabular list: look up a condition, an external cause, a substance, or a neoplasm site by name and follow it to its code.
ICD-10-CM Index to Diseases and Injuries
The alphabetic index to the ICD-10-CM tabular list: look up a condition by name and follow it to its code.
Look up a condition, sign or injury by name. The alphabetic index is the starting point for code selection; always confirm the entry against the tabular list before assigning it.
81,641 entriesExternal Causes IndexICD-10-CM External Causes of Injury Index
The alphabetic index to external cause of morbidity codes: how an injury happened, where, and during what activity.
Look up how an injury occurred. External cause codes are secondary codes; they never appear as the principal diagnosis.
8,090 entriesTable of Drugs and ChemicalsICD-10-CM Table of Drugs and Chemicals
Substance-by-substance codes for poisoning, adverse effect and underdosing, split by intent: accidental, intentional self-harm, assault, or undetermined.
Each substance carries a different code depending on intent: accidental, intentional self-harm, assault or undetermined poisoning, an adverse effect of a correctly administered drug, or underdosing.
5,184 entriesTable of NeoplasmsICD-10-CM Table of Neoplasms
Codes by anatomical site and neoplasm behavior: malignant primary or secondary, in situ, benign, uncertain or unspecified.
Find the site first, then the column matching the behavior stated in the diagnosis. Behavior must come from the pathology report, not from the site alone.
1,820 entriesRead from: CMS/CDC ICD-10-CM release files (tabular list, order file, addenda) — FY2027. All data sources · How to read the labels
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources