Dr. Gregg Philip Hartman, MD

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

• Adventist Health Simi Valley Hospital · Simi Valley, CA · listed as Simi Valley Hospital & Health Care Services

Colleagues at Ventura Orthopedics Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 78 clinicians in the practice; 12 are shown here.

• Christian Castellanos Physician Assistant · Oxnard, CA
• Rick Deleon, PA Physician Assistant · Encino, CA
• Shaina Demichele Physical Therapist · Rockwall, TX
• Miles Lee Dumosch, DPT Physical Therapist · Ventura, CA
• Rebecca Meilssa Guinn, MPT Physical Therapist · Thousand Oaks, CA
• Marquis Andrew Kennedy, PA-C Physician Assistant · Los Angeles, CA
• Alexa Khantzian Physical Therapist · Rowlett, TX
• Dr. Timothy Jerad Rearick, MD Orthopaedic Foot and Ankle Surgery Physician · Thousand Oaks, CA
• Mrs. Jacqueline Suzanne Rood, PT Physical Therapist · Simi Valley, CA
• Dr. Dylan Horst Shafer, DO Student in an Organized Health Care Education/Training Program · Ventura, CA
• Jared Lee Sinn, DPT Physical Therapist · Thousand Oaks, CA
• Dr. Joshua Toussaint Turner, DPT Physical Therapist · Thousand Oaks, CA

Other providers in Simi Valley

• Alan Rashkin, MD a Professional Corp

  Organization Orthopaedic Surgery Physician · NPI 1205020351

  1350 E Los Angeles Ave Ste 203, Simi Valley, CA 93065 · (805) 527-3222

• Olumuyiwa Idowu

  Individual Orthopaedic Surgery Physician · NPI 1518461391

  2525 Erringer Rd, Simi Valley, CA 93065-2352 · (805) 527-1404

• Regents of the University of California

  Organization Orthopaedic Surgery Physician · NPI 1851851372

  3605 Alamo St Ste 200, Simi Valley, CA 93063-2186 · (805) 578-8550

• Zachary Tuvya Sharfman, MD

  Individual Orthopaedic Surgery Physician · NPI 1295266799

  2655 1st St Ste 300, Simi Valley, CA 93065-1580 · (805) 578-8550

• Southern California Orthopedic Institute, LP

  Organization Orthopaedic Surgery Physician · NPI 1346582665

  3605 Alamo St, Simi Valley, CA 93063-2186 · (805) 578-8550