Mark David Alter

Practice locations

• Good Samaritan Regional Health Center
  1 Good Samaritan Way , Mount Vernon, IL 62864
  Call 5572031601
• Sentara Medical Group
  1080 1st Colonial Rd Suite 403, Virginia Beach, VA 23454
  Call 7573951850
• Sentara Medical Group
  131 Valley Rd , Ardmore, PA 19003
  Call 7573951850
• Trinity Health Mid-Atlantic Medical Group
  1500 Lansdowne Ave , Darby, PA 19023
  Call 6102374210
• Cedars-Sinai Medical Care Foundation
  4650 Lincoln Blvd , Marina Del Rey, CA 90292
  Call 3108238911
• University Of Maryland Community Medical Group Inc
  5 Garrett Ave , La Plata, MD 20646
  Call 3016094000
• Delaware County Professional Services, Inc
  551 W Lancaster Ave , Haverford, PA 19041
  Call 6108923800
• Bayhealth Medical Center, Inc
  640 S State St , Dover, DE 19901
  Call 3027444700
• Cedars-Sinai Medical Center
  8700 Beverly Blvd , West Hollywood, CA 90048

CMS measures of specific care

These are 2024 results reported for this clinician’s NPI. Each CMS rating describes one measure of care, not patient reviews or an overall doctor grade. The patients, ages and insurance types included depend on the measure and collection method; these are not necessarily Medicare-only or pediatric results. They do not establish performance at a particular current practice.

No individual clinical measures approved by CMS for profile display are available for this doctor in this release. Missing results do not mean poor care. Many clinicians or measures are not publicly reported.

Released 2026-09-10. Only CMS display-approved MIPS and QCDR clinical measures are shown; participation attestations and cost measures are excluded. CMS uses a benchmark drawn from best performers covering at least 10% of the relevant patient population, with an adjustment for small denominators. ModernDoc has not independently validated these ratings. Source data and reported rates · CMS rating methodology · Coverage and reporting limits.

Reported procedure activity

CMS attributes these procedures to this clinician through Original Medicare and Medicare Advantage claims and encounters. Counts span locations and are not unique-patient counts. They do not establish quality, current availability, or that a procedure is offered at any practice listed here. Other insurance populations are not included.

No procedure activity is available for display in this release. This does not mean this doctor has no experience.

CMS release 2026-10-15. CMS describes a 12-month observation window with a three-month claims-processing lag; this file does not provide exact start and end dates. Only categories CMS marks for profile display are shown. Source data · How CMS reports procedures.

Patient experience at affiliated groups

No group survey results are linked in this release. Missing information is not a judgment about this doctor’s care.

CMS group survey year 2024 · Released 2026-09-10. View the source data · How CMS reports these measures.