What is Included in a 90-Day Global Period?: Complete Billing Guide

The 90-day global surgical package represents one of the most complex yet crucial concepts in surgical billing. Understanding what services are included—and more importantly, what can be billed separately—directly impacts practice revenue. Research shows that surgical practices lose an average of $87,000 annually per surgeon due to improper global period billing, often by failing to bill separately for services outside the global period.

This comprehensive guide demystifies the 90-day global period, explains exactly what services are included from pre-operative evaluation through post-operative care, identifies when return-to-operating-room modifiers (58, 78, 79) apply, and provides clear guidance on distinguishing complications from new problems. Whether you're optimizing existing billing practices or training new staff, this resource ensures you capture all appropriate revenue while maintaining compliance with complex global period regulations.

Global Period Fundamentals

The global surgical package bundles multiple services into a single payment, representing Medicare's approach to episode-based care for surgical procedures.

What Constitutes the 90-Day Global Period

• Pre-operative period: Day before surgery (1 day)
• Intra-operative period: Day of surgery (1 day)
• Post-operative period: 90 days after surgery
• Total duration: 92 calendar days

Key Principle: The global period includes all services "typically" required for the procedure. Services that are unusual, unexpected, or unrelated may be billed separately with appropriate modifiers.

Global Period Variations by Procedure Type

Global Period	Duration	Common Procedures	Post-Op Visits Included
000	Day of surgery only	Endoscopy, minor procedures	None
010	10 days post-op	Minor surgeries, biopsies	All routine visits
090	90 days post-op	Major surgeries	All routine visits
XXX	No global period	E/M visits, consultations	N/A
YYY	Determined by carrier	Unlisted procedures	Varies
ZZZ	Follows primary procedure	Add-on codes	Same as primary

Pre-Operative Services (Day Before Surgery)

The global package includes one day of pre-operative services, typically encompassing final pre-surgical evaluation and preparation.

Included Pre-Operative Services

• Pre-operative H&P: History and physical examination
• Surgical planning: Final procedure planning and preparation
• Consent process: Informed consent discussion
• Pre-operative orders: Laboratory tests, imaging, medications
• Anesthesia consultation: If performed by surgeon

Separately Billable Pre-Operative Services

Services performed more than one day before surgery or unrelated to the surgical procedure may be billed separately:

• Initial consultation (modifier 57): Decision for surgery made during visit
• Unrelated E/M services (modifier 25): Management of unrelated conditions
• Emergency visits: Unexpected problems requiring immediate attention
• Diagnostic procedures: Complex diagnostic workup not included in surgical planning

Intra-Operative Services (Surgery Day)

The day of surgery includes all services directly related to performing the procedure and immediate post-operative care.

Included Surgery Day Services

• Primary surgical procedure: The main operation performed
• Immediate post-operative care: Recovery room management
• Typical complications management: Expected issues during surgery
• Additional procedures: If integral to primary procedure
• Wound closure: Standard closure techniques

Separately Billable Surgery Day Services

Certain services may be billed separately even on the day of surgery:

• Unrelated E/M services (modifier 25): Management of separate medical conditions
• Critical care (modifier 25): Intensive care for life-threatening complications
• Distinct procedures (modifier 59): Procedures on different anatomical sites
• Significant separate procedures (modifier 79): Unrelated procedures during healing period

Post-Operative Period (90 Days After Surgery)

The 90-day post-operative period includes all routine follow-up care and typical complications management.

Included Post-Operative Services

• Routine follow-up visits: Scheduled post-operative appointments
• Wound care: Suture removal, dressing changes
• Complication management: Treatment of typical surgical complications
• Pain management: Post-operative pain control
• Patient education: Post-operative instructions and counseling
• Adjustment of medications: Post-operative medication modifications

What Constitutes "Routine" Post-Operative Care

Medicare defines routine post-operative care as services that are:

• Typical for the procedure: Expected based on procedure type
• Performed by the same physician: Surgeon or practice group
• Related to the surgery: Direct consequence of surgical intervention
• Expected complications: Complications that occur in normal healing

Return to Operating Room Modifiers: 58, 78, 79

Understanding when to apply return-to-OR modifiers is crucial for capturing appropriate additional revenue during the global period.

Modifier 58: Staged or Related Procedure

Definition: Staged or related procedure by the same physician during the post-operative period

Criteria for Use:

• Planned staging: Procedure was planned as part of multi-stage treatment
• More extensive procedure: Originally planned conservative procedure requires more extensive intervention
• Therapy following diagnostic procedure: Therapeutic intervention following diagnostic procedure

Payment Impact:

• New global period starts: Fresh 90-day period begins
• Full payment: 100% of procedure's usual fee schedule
• No reduction: Unlike modifier 78, no payment reduction applied

Modifier 58 Examples

Original Procedure	Follow-up Procedure	Modifier 58 Rationale
Cholecystectomy	ERCP with sphincterotomy	Planned if complications arise
Bowel resection	Ileostomy takedown	Planned staged procedure
Hernia repair	Component separation	More extensive repair needed
Exploratory laparotomy	Definitive resection	Therapy following diagnostic

Modifier 78: Unplanned Return for Complication

Definition: Unplanned return to operating room for complication of initial procedure

Criteria for Use:

• Same physician/group: Performed by original surgeon or group
• Complication of original procedure: Directly related to initial surgery
• During global period: Occurs within 90-day post-operative period
• Unplanned: Not anticipated as part of normal recovery

Payment Impact:

• Reduced payment: Only intra-operative portion paid (approximately 70%)
• No new global period: Original global period continues
• Post-operative care included: Follow-up care for complication included

Modifier 78 Examples

Original Procedure	Complication	Return Procedure	Modifier 78 Rationale
Appendectomy	Post-op bleeding	Exploration, hemostasis	Unplanned, complication-related
Cholecystectomy	Bile leak	Laparoscopic repair	Unplanned, complication-related
Hernia repair	Wound dehiscence	Wound exploration, repair	Unplanned, complication-related
Bowel resection	Anastomotic leak	Repair with diversion	Unplanned, complication-related

Modifier 79: Unrelated Procedure

Definition: Unrelated procedure by same physician during post-operative period

Criteria for Use:

• Completely unrelated: No relationship to original procedure
• Different diagnosis: Separate medical condition
• Same physician/group: Performed by original surgeon or group member
• During global period: Within 90 days of original procedure

Payment Impact:

• Full payment: 100% of procedure's usual fee schedule
• New global period: Fresh 90-day period starts for new procedure
• No reduction: Completely separate billing entity

Modifier 79 Examples

Original Procedure	Subsequent Procedure	Modifier 79 Rationale
Cholecystectomy	Appendectomy	Completely unrelated condition
Hernia repair	Colonoscopy with biopsy	Separate GI evaluation
Thyroidectomy	Inguinal hernia repair	Different anatomical region
Mastectomy	Cholecystectomy	Unrelated surgical indication

Complications vs New Problems: The Critical Distinction

Properly distinguishing between complications and new problems determines whether additional services can be billed separately during the global period.

Complications (Included in Global Period)

Definition: Problems that arise as a direct result of the surgical procedure and are considered part of normal healing or expected risks.

Characteristics of Complications:

• Direct relationship: Caused by the surgical procedure
• Expected risk: Known potential complication of the procedure
• Same anatomical area: Involves the surgical site or related structures
• Healing-related: Part of normal recovery process

Common Surgical Complications (Included)

Procedure Type	Typical Complications (Included)	Management
Cholecystectomy	Port site infection, minor bile leak, nausea	Antibiotics, conservative management
Hernia Repair	Seroma, hematoma, wound healing delay	Observation, drainage, wound care
Appendectomy	Ileus, wound infection, adhesion formation	Conservative management, antibiotics
Bowel Resection	Delayed gastric emptying, minor leak	NPO, TPN, conservative management

New Problems (Separately Billable)

Definition: Medical conditions that arise independently of the surgical procedure or represent new diagnoses unrelated to the surgery.

Characteristics of New Problems:

• No direct relationship: Not caused by surgical procedure
• New diagnosis: Different from surgical indication
• Different anatomical area: Unrelated to surgical site
• Independent occurrence: Would have occurred regardless of surgery

Examples of New Problems (Separately Billable)

Scenario	New Problem	Billing Approach	Modifier
Post-cholecystectomy patient	Myocardial infarction	E/M for cardiac management	24 or 25
Post-hernia repair patient	Pneumonia	E/M for respiratory condition	24 or 25
Post-appendectomy patient	Urinary tract infection	E/M for UTI management	24 or 25
Post-thyroidectomy patient	Diabetes management	E/M for endocrine management	24 or 25

Global Period Modifiers: Complete Reference

Modifier 24: Unrelated E/M During Global Period

Use for: E/M services for problems unrelated to the surgical procedure

Payment: Full E/M payment

Documentation requirement: Different diagnosis from surgical indication

Modifier 25: Significant, Separately Identifiable E/M

Use for: E/M services on same day as procedure or during global period

Payment: Full E/M payment if criteria met

Documentation requirement: Separate problem or decision for surgery

Modifier 57: Decision for Surgery

Use for: E/M visit where decision for major surgery (90-day global) is made

Payment: Full E/M payment

Timing: Day before or day of surgery

Global Period Documentation Requirements

Proper documentation is essential for supporting modifier usage and separate billing during global periods.

Essential Documentation Elements

For Modifier 24 (Unrelated E/M)

• Different diagnosis: ICD-10 code unrelated to surgery
• Separate medical record: Distinct note from post-operative care
• Clinical rationale: Medical necessity for evaluation
• Clear separation: No mention of surgical site or recovery

For Modifier 58 (Staged Procedure)

• Planning documentation: Evidence procedure was planned or anticipated
• Staging rationale: Why staged approach was necessary
• Relationship to original: Connection between procedures
• Separate operative note: Complete documentation of subsequent procedure

For Modifier 78 (Return for Complication)

• Complication description: Specific post-operative problem
• Relationship to surgery: Direct result of original procedure
• Urgency documentation: Why return to OR was necessary
• Unplanned nature: Evidence complication was unexpected

Documentation Template for Global Period Services

GLOBAL PERIOD E/M NOTE TEMPLATE

Date: [Post-operative day X]
Chief Complaint: [Specific to new problem OR post-operative care]

History of Present Illness:
[If routine post-op]: Patient returns for routine post-operative follow-up after [procedure] performed on [date]. [Routine recovery assessment]

[If new problem]: Patient presents with [specific complaint unrelated to surgery]. [New problem details]. Surgical site [status if relevant, or "unrelated to current complaint"]

Assessment and Plan:
[If routine]: Post-operative course progressing as expected. [Routine care plan]

[If new problem]: [New diagnosis with ICD-10]. [Treatment plan for new condition]. Surgical recovery on separate track and progressing appropriately.

Common Global Period Billing Errors

1. Billing Routine Post-Operative Visits

Error: Billing E/M codes for routine follow-up during global period

Impact: Claim denial, potential audit flags

Solution: Only bill E/M for unrelated problems with modifier 24

2. Inappropriate Modifier 78 Usage

Error: Using modifier 78 for planned procedures or unrelated issues

Impact: Incorrect payment reduction (should be modifier 58 or 79)

Solution: Distinguish planned vs unplanned, related vs unrelated

3. Missing Modifier 25 Documentation

Error: Billing E/M with modifier 25 without supporting separate problem

Impact: E/M service denial

Solution: Document separate medical decision-making clearly

4. Billing Complications as New Problems

Error: Billing expected complications with modifier 24

Impact: Inappropriate additional payment, audit risk

Solution: Understand difference between complications and new problems

5. Inadequate Modifier 57 Support

Error: Using modifier 57 without documenting surgical decision

Impact: E/M service included in global package

Solution: Document that surgical decision was made during visit

Global Period Audit Considerations

Global period billing is a frequent audit target due to its complexity and revenue impact.

Audit Red Flags

• High modifier usage: Frequent use of modifiers 24, 25, 58, 78, 79
• Statistical outliers: Higher than average post-operative E/M billing
• Pattern inconsistencies: Same diagnoses billed as both complications and new problems
• Documentation gaps: Modifier usage without supporting documentation
• Timing issues: E/M services during early global period

Audit Defense Strategies

• Detailed documentation: Support every modifier with clear clinical rationale
• Consistent policies: Standardized approach to global period billing
• Regular training: Keep staff updated on global period rules
• Internal audits: Regular review of global period billing patterns
• Clear templates: Standardized documentation for common scenarios

Maximizing Appropriate Revenue During Global Periods

Legitimate Billing Opportunities

Many practices lose revenue by failing to bill appropriately for services outside the global package:

• Unrelated E/M services: Management of chronic conditions with modifier 24
• Emergency visits: Unscheduled visits for new problems
• Critical care: Life-threatening complications requiring ICU-level care
• Complex procedures: Staged procedures with modifier 58
• Diagnostic procedures: Unrelated diagnostic workup

Revenue Recovery Strategies

1. Staff education: Train all providers on global period rules and exceptions
2. Documentation improvement: Use templates to ensure complete documentation
3. Billing system optimization: EMR alerts for global period patients
4. Regular audits: Monthly review of potential missed billing opportunities
5. Modifier training: Specific education on when and how to use each modifier

Frequently Asked Questions

1. Can I bill an E/M visit on the day of surgery?

Yes, but only with modifier 25 if the E/M addresses a significant, separately identifiable service. For major surgery, if the E/M leads to the decision for surgery, use modifier 57 instead.

2. What if a patient needs emergency care during the global period for an unrelated problem?

Bill the emergency visit with modifier 24, ensuring the diagnosis is unrelated to the surgical procedure. Document the emergency nature and separate medical necessity clearly.

3. How do I determine if a complication requires modifier 78 or is included in the global period?

If the complication requires return to the operating room, use modifier 78. If it can be managed in the office or hospital room, it's typically included in the global period.

4. Can I bill for complications that occur after the global period ends?

Yes, once the global period expires, all services can be billed separately. However, if it's clearly a late complication of the surgery, some payers may still consider it related.

5. What documentation do I need for modifier 58 (staged procedure)?

Document that the subsequent procedure was planned, represents a more extensive procedure than originally performed, or is therapy following a diagnostic procedure. The relationship between procedures should be clear.

Global Period Principle: The global period includes everything typically needed for the procedure. Services that are unusual, unexpected, or unrelated to the surgery can be billed separately with proper documentation and modifiers.

Understanding global period billing is essential for optimizing surgical practice revenue while maintaining compliance. The key is distinguishing between included services and those that warrant separate payment, properly applying modifiers, and maintaining detailed documentation to support billing decisions. Regular training and internal audits help ensure your practice captures all appropriate revenue while avoiding compliance risks associated with global period violations.