What Is a Global Period?

What a Global Period Means

A global period is the defined timeframe before and after a surgical procedure during which all related services are considered part of the surgical package and cannot be billed separately. CMS assigns every surgical CPT code a global period indicator: 000 for zero days, 010 for ten days, or 090 for ninety days. A 90-day global period for a major joint replacement means that all postoperative office visits, dressing changes, and related care for 90 days after surgery are included in the single surgical payment. The surgeon receives one fee that covers the procedure itself plus all routine follow-up care within that window.

Why Global Periods Matter

Global period rules are one of the most common sources of surgical billing denials. A surgeon who bills a postoperative E/M visit without modifier 24 during a 90-day global will receive a CARC 97 bundling denial because the visit is considered included in the surgical fee. Surgical practices that fail to track global periods across their patient population leave an estimated 7% of surgical follow-up charges unrecoverable or incorrectly written off. Understanding global periods is essential for surgical coders, billing staff, and any provider who performs procedures with postoperative care components.

How Global Periods Affect Your Claim

When you submit a claim during an active global period, the payer's system checks whether the billed service is related to the original surgery. Related services are automatically bundled and denied with CARC 97. Unrelated services require modifier 24 on E/M codes or modifier 79 on procedures performed by a different physician during the postoperative period. The global period start date is typically the day of surgery for 90-day globals, and billing systems must track this date for every surgical patient to prevent accidental duplicate billing. Payers also apply global period logic to diagnostic tests and supplies deemed incidental to the surgical procedure.

What to Do About Global Period Denials

When you receive a CARC 97 denial during a global period, determine whether the service was truly related to the surgery. If the visit addressed an unrelated condition, resubmit with modifier 24 and documentation supporting the separate medical reason. If the service was legitimately separate — such as a distinct procedure on a different anatomic site — append modifier 59 or the appropriate X-modifier. Implement global period tracking in your practice management system to flag claims before submission. For complex global period denials, upload your EOB to Denial Appeal Pro for an appeal strategy tailored to the bundling reason.

Frequently Asked Questions

What are the three global period categories?

CMS assigns global periods of 0 days, 10 days, or 90 days. Zero-day globals include minor procedures with no follow-up included. Ten-day globals cover limited postoperative care. Ninety-day globals include all related services for three months after major surgery.

Can I bill a postoperative visit during the global period?

Postoperative visits related to the surgery are included in the global fee and cannot be billed separately. Unrelated visits during the global period may be billed with modifier 24.

What modifier is used for unrelated E/M during a global period?

Modifier 24 is appended to an evaluation and management code when the visit is for a condition unrelated to the surgery and occurs during the postoperative global period.

What CARC code appears for global period bundling denials?

CARC code 97 is the most common adjustment for services bundled into a global surgical package. The payer considers the service included in the payment for the primary procedure.