Understanding global periods is essential to avoid denials and lost revenue.
🔹 What is a Global Period?
The global period includes:
- Pre-op
- Surgery
- Post-op care
🔹 Types of Global Periods
| Type | Duration | Example |
| Minor | 0–10 days | Injections |
| Major | 90 days | Cataract surgery |
🔹 Common Modifiers
Modifier 24
Unrelated E/M during post-op period
Modifier 25
Significant, separately identifiable E/M on same day
Modifier 79
Unrelated procedure during global period
🔹 A-Scan & Global Period
- Usually included in pre-op
- Repeat A-scan requires medical necessity
🔹 Surgery Scenarios
Same Eye (during global)
- Usually not separately payable
Different Eye
- Use modifier -79 or -RT/-LT
🔹 Pro Tip
Always document:
- Why service is unrelated
- Which eye (laterality)
