|ENVISION HEALTHCARE CORP filed this Form 10-Q on 08/08/2017|
Depreciation and amortization for our physician services segment was approximately $61.8 million and $123.4 million for the three and six months ended June 30, 2017, respectively, and $21.2 million and $41.5 million for the three and six months ended June 30, 2016, respectively, resulting primarily from amortizable intangible assets related to our customer relationships with hospitals. The increase is primarily due to the inclusion of EHH, which contributed $32.6 million and $66.1 million, respectively, and from recent acquisitions completed in 2016 and 2017.
During the six months ended June 30, 2017, equity in earnings (loss) of unconsolidated affiliates decreased to a loss of $0.7 million from earnings of $4.9 million for the six months ended June 30, 2016 due to the consolidation of an affiliate previously accounted for as an equity method investment.
Ambulatory Services Operations
The following table presents certain operating data of our ambulatory services segment for the three and six months ended June 30, 2017 and 2016. An ASC is deemed to be under development when a LP or LLC has been formed with the physician partners to develop the ASC.
Of the continuing centers in operation at June 30, 2017, 159 centers performed gastrointestinal endoscopy procedures, 57 centers performed procedures in multiple specialties, 37 centers performed ophthalmology procedures and 10 centers performed orthopaedic procedures.
A significant measurement of our ambulatory service revenues growth from year to year is the change in our same-center revenue. We define our same-center group each year as those centers that contain full year-to-date operations in both comparable reporting periods, including the expansion of the number of operating centers associated with a LLC or LP. Ambulatory services revenues at our 2017 same-center group, constituting approximately 95% of our total number of consolidated centers, increased by 0.6% and 1.3% during the three and six months ended June 30, 2017, respectively, comprised of a 0.1% and 0.3% increase in procedures and a 0.5% and 1.0% increase in revenue per procedure as compared to the prior year period.