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New ICD-10 Terminology

Key Differences

ICD-10-CM not only comes with a new diagnosis code set, it also has nuances not found in ICD-9. In ICD-10, “excludes” is used differently than in ICD-9 – and there are now two types:

  • Excludes1 notes indicate two medical conditions that can't be reported on the same eye the same day.
  • Excludes2 notes indicate two medical conditions that can be reported on the same eye the same day.

Under ICD-10, you also need to provide more detail for some diagnoses, such as:

  • Which eye the condition is in (some codes require you to indicate laterality; others do not).
  • Whether a diagnosis is reported by eye or by lid.

In other cases, you need to add a seventh digit:

  • For cases such as corneal foreign body and lacerations, a seventh digit is required for injury codes. E.g.:
    • A – Initial encounter
    • D – Subsequent encounter
    • S - Sequel
  • Conditions like primary open angle glaucoma and low-tension glaucoma require a code indicating how advanced the case is. If you don’t know, you can indicate an indeterminate stage.

Translating from ICD-9 to ICD-10

Use these AAOE guides to start learning how to code common procedures in ICD-10.