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Global Period Calculator

Periods

Period T₁Period T₂

2.6181 s

Beat Period

3.820e-1 Hz

Beat Frequency

0.6180

T₁/T₂ Ratio

1.2361 s

Harmonic Mean Period

1.2720 s

Geometric Mean Period

Beat period = 1 / |f₁ − f₂|. Two slightly different frequencies produce a pulsing interference pattern at the beat frequency. Classic examples: tuning a guitar string, Jupiter–Saturn conjunctions (~19.86 yr beat).

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What is Global Period Calculator?

Global Period Calculator determines the end date of Medicare’s global surgical period so medical billers know when follow-up services can be billed separately.

Global Period Calculator Formula / Method

End date = procedure date + global days (0, 10, or 90)

(using Medicare counting rules)

Global Period Calculator Step-by-Step

Enter all required inputs shown in the calculator.
Check units/scales or grading format where applicable.
Apply the calculator method for this tool.
Review the computed output.
Use the result for planning, verification, or comparison.

Global Period Calculator Worked Example

Surgery performed on 10 January 2025 (90-day global period)

Global period ends on 10 April 2025

Where Global Period Calculator Is Applied

Used in medical billing, healthcare administration, physician offices, and hospitals for Medicare surgical billing and follow-up care rules.

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