10 day global period

I have asked this question in the past with different answers I'm still confused.
We do biopsies in our office. Some of them have 10day global period. What is the actual time frame. Is it from the day it was DONE or starting from the day AFTER the procedure? Can someone please help. Most of our patients have copay's. So we don't know if they should be paying copay's or not depending on the global time. Or it the doctors are able to charge an office visit. So if a patient had a biopsy 7/2/13 what would his ending global day be 7/11(this would be from the day OF procedure) or 7/12 (this would be from the day AFTER procedure.). Sorry if confusing. Please if anybody can help. Thanks

re: 10 day global period

The guidance for major and minor global periods per Cahaba which is my Medicare contractor are listed below. This information may be viewed in its entirety in the physician manual in section 40.1 here is the link: http://www.cms.gov/Regulations-and-Guidance/Guidance/Manuals/downloads/clm104c12.pdf

E. Determining the Duration of a Global Period

To determine the global period for major surgeries, carriers count 1 day immediately before the day of surgery, the day of surgery, and the 90 days immediately following the day of surgery.

EXAMPLE:
Date of surgery - January 5
Preoperative period - January 4
Last day of postoperative period - April 5
To determine the global period for minor procedures, carriers count the day of surgery and the appropriate number of days immediately following the date of surgery.

EXAMPLE:

Procedure with 10 follow-up days:
Date of surgery - January 5
Last day of postoperative period - January 15