The global period in medical billing bundles routine pre-operative, intra-operative, and post-operative services into one Medicare payment under the global surgical package. Understanding these rules prevents revenue loss and ensures compliance.
Per the Centers for Medicare & Medicaid Services (CMS), the global surgical package covers all necessary services normally furnished by the surgeon (or same-group, same-specialty providers) before, during, and after a procedure. This applies across settings, including offices, hospitals, and ambulatory surgical centers (ASCs).
What Is the Global Surgical Package?
The global surgical package, also called global surgery, bundles payment for a procedure and its related care during a defined period. Medicare pays one fee that includes post-operative visits within the global timeframe—providers in the same group and specialty bill as a single physician.
The package follows the Medicare Physician Fee Schedule (MPFS) global surgery indicators: 000, 010, 090, or YYY (contractor-determined).
Types of Global Periods
CMS defines three global surgical packages based on post-operative days.
0-Day Global Period
Applies to endoscopies and some minor procedures.
- No pre-operative period.
- No post-operative days.
- Visit on the procedure day is generally not payable separately. Total: Procedure day only.
10-Day Global Period
Applies to other minor procedures.
- No pre-operative period.
- Visit on procedure day is not payable separately.
- Total global period: 11 days (surgery day + 10 following days).
90-Day Global Period
Applies to major procedures.
- Includes 1 pre-operative day.
- Procedure day is not payable separately.
- Total global period: 92 days (1 day before + surgery day + 90 following days).
Use the CMS MPFS lookup tool (select “Global” under Modifiers) to confirm a code’s period.
What Services are Included in the Global Surgical Package
The APAC has provided guidelines to help clarify what is included in the package and what is not. The package encompasses:
- Pre-operative visits after the decision to operate (day before for 90-day; day off for 0- and 10-day).
- Intra-operative services.
- All post-operative medical or surgical services for complications not requiring return to the operating room (OR).
- Follow-up visits and post-surgical pain management.
- Supplies (except specified exclusions).
- Routine care: dressing changes, suture/staple removal, catheter changes, etc.
What Services are Excluded from the Global Package (Bill Separately)
You can bill and receive separate payment for:
- Initial evaluation leading to major surgery decision (use modifier 57).
- Unrelated visits or procedures (different diagnosis).
- Diagnostic tests and radiological procedures.
- Staged or unrelated procedures during the post-op period.
- Treatment of complications requiring return to the OR (use modifier 78).
- Critical care services unrelated to surgery (use modifier FT).
- Immunosuppressive therapy for transplants.
For minor procedures or endoscopies, post-op visits beyond the defined days are separately payable.
Essential Modifiers for Global Period Billing
Modifiers distinguish billable services within the global period.
- Modifier 24: Unrelated E/M service by the same physician during the post-op period.
- Modifier 25: Significant, separately identifiable E/M on the same day as a minor procedure.
- Modifier 57: Decision for surgery (E/M leading to major procedure decision; 90-day only).
- Modifier 58: Staged or related procedure (planned; starts new global period).
- Modifier 78: Unplanned return to OR for related complications (no new global period).
- Modifier 79: Unrelated procedure or service by the same physician (starts new global period).
Handling Transfers of Care and Split Billing
When post-operative care transfers:
- Modifier 54 (Surgical Care Only): Surgeon bills when providing only the surgical portion (formal or informal transfer; required for 90-day globals even without documented agreement since 2025).
- Modifier 55 (Post-operative Management Only): Receiving provider bills for post-op care (10- or 90-day only; requires at least one service and written agreement).
- Modifier 56 (Pre-operative Care Only): For pre-op transfer only.
Bill the same CPT code and surgery date. Surgeon receives intraoperative share; post-op provider receives post-operative share.
New HCPCS G0559 for Postoperative Care
Introduced in 2025, add-on code G0559 reports post-operative office/outpatient E/M visit complexity for a practitioner other than the surgeon (or same-group practitioner) when no formal transfer occurs. It captures additional time and resources for follow-up visits.
Bill once per 90-day period with the E/M code; no modifier required. Same-specialty providers in the same group may use it under specific conditions.
Determining and Tracking the Global Period
Check global days in the MPFS lookup tool. Use global surgery calculators from MACs (e.g., Novitas) to calculate end dates. Track via EHR to flag services within the period and apply correct modifiers.
Common Pitfalls and Best Practices
Pitfalls include billing-related post-op E/M without modifiers, failing to document transfers, or missing unrelated services with modifier 24/79.
Best practices:
- Verify the global indicator before billing.
- Document medical necessity for separate services.
- Use modifier 54 proactively for informal transfers.
- Report G0559 appropriately for non-surgeon post-op care.
- Train staff on MACRA-mandated post-op visit reporting in select states.
Latest CMS Updates for 2025-2026
The last MPFS expanded modifier 54 to informal transfers for 90-day globals and added G0559. The December 2025 MLN Global Surgery Booklet incorporates these with no substantive 2026 changes. Data collection on post-operative visits continues via no-pay G-codes in nine states to refine package valuation. CMS solicited comments on payment accuracy, but finalized no major valuation overhaul for 2026.
Conclusion
The global period in medical billing bundles pre-, intra-, and post-operative care into one payment under Medicare’s three package types (0-, 10-, and 90-day). Mastering included services, excluded billable items, modifiers (especially 54 and 57), transfers, and G0559 ensures accurate claims, reduces denials, and supports compliance. Stay current with CMS MPFS tools and the official Global Surgery Booklet to protect revenue.
Ready to streamline your surgical billing and eliminate global period errors? Partner with Connecticut Medical Billing for expert Medicare-compliant coding, modifier application, and revenue optimization. Contact us today for a free audit and consultation, and maximize reimbursements starting now.
Frequently Asked Questions
What does a 90-day global period mean?
A 90-day surgical global period is a bundled payment system covering all care related to a surgery, provided by the surgeon or their team, before and after the procedure.
What is the 24 modifier for the global period?
Use CPT modifier 24 for unrelated evaluation and management service during a postoperative (global) period. The global period of a major surgery is the day before, the day of, and 90 days after the surgery.