The International Classification of Diseases, Tenth Revision, provides alphanumeric codes for diagnoses. Codes specify the condition, and often laterality, encounter type, and whether the presentation is initial, subsequent, or a sequela.
They appear on billing claims and increasingly within clinical documentation.
Alternative Names:
ICD Code, Diagnosis Code
Why it Matters?
Diagnosis codes let a reviewer trace a condition across providers and time without reading every note, which makes them the fastest way to identify prior treatment for the same complaint. Encounter type is particularly useful, since a code marked as a subsequent encounter or sequela indicates the condition predated the visit. Coding is imperfect and driven by reimbursement, so codes support analysis rather than proving diagnosis.
Frequently Confused with
Related terms
Frequently asked questions
Can a diagnosis code prove a condition existed?
Why does encounter type matter?
