0-day global (minor procedure)

The global surgical package bundles all routine care surrounding a procedure into one payment. For procedures assigned a 0-day global period (Medicare indicator: 000), that bundle spans exactly one calendar day—the day of the procedure. There is no pre-operative period, meaning a visit on the day before the procedure is not included and can potentially be billed separately. There are also zero post-operative days, so any follow-up visit on the day after the procedure can—in principle—be billed independently if it is medically necessary and documented.

In orthopedics, many common in-office procedures carry a 0-day global: joint and bursa aspirations, trigger-point injections, simple I&D of superficial abscesses, minor débridements, and certain small biopsies. CMS assigns the 000 indicator to these codes in the Medicare Physician Fee Schedule (MPFS), and commercial payers frequently mirror the same logic. Because the entire global window compresses into a single day, the coding rules differ meaningfully from 10-day or 90-day globals—most importantly around which modifier governs a separately billed E/M service.

The 0-day designation does not imply the procedure is trivial; it reflects the expected care pattern. A provider still delivers a complete surgical service—pre-procedure assessment, the procedure itself, and immediate post-procedure monitoring—and is compensated through the single global payment. What the designation tells a payer is that routine follow-up beyond that day is not anticipated to be procedure-related and therefore is not pre-paid through the global fee.

Getting the global period wrong on a 0-day procedure has direct reimbursement consequences. The most common error is appending modifier 57 (decision for surgery) to an E/M billed on the same day as a 0-day procedure. CMS explicitly prohibits modifier 57 with 000- or 010-day global procedures, and MACs routinely deny the E/M when they see it. The correct modifier is 25, which signals a significant, separately identifiable E/M beyond the usual pre- and post-procedure care. Using 57 instead of 25—or omitting a modifier altogether—results in either a denial of the E/M or, if both claims pay in error, a downstream audit finding and repayment obligation. Conversely, understanding that post-operative days are zero means a follow-up visit the next day is not bundled; failing to bill it at all leaves legitimate revenue on the table.