Christopher Warwick Wulff, 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.

Colleagues at John Muir Physician Network

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 486 clinicians in the practice; 12 are shown here.

• MS. Milissa A Buriel, FNP Family Nurse Practitioner · Pleasant Hill, CA
• Dr. Diane B Chandler, DO Family Medicine Physician · Concord, CA
• Dr. Christine M Chang, MD Internal Medicine Physician · Danville, CA
• Andrea Darnell, DO Student in an Organized Health Care Education/Training Program · Walnut Creek, CA
• Matthew S Devane, DO Cardiovascular Disease Physician · Walnut Creek, CA
• Dr. Susanne U Duesberg, MD Family Medicine Physician · Concord, CA
• Dr. Rina Shah Garuda, MD Family Medicine Physician · Columbus, OH
• Dr. Adric H Huynh, BS, MS, MD Family Medicine Physician · Brentwood, CA
• Dr. Libre Johnson, MD Family Medicine Physician · Walnut Creek, CA
• Dr. Jason Y. Liu, MD Internal Medicine Physician · Walnut Creek, CA
• Dr. Manisha Malhotra, MD Internal Medicine Physician · Alamo, CA
• Dr. Angad Singh Oberoi, DO Student in an Organized Health Care Education/Training Program · Pleasant Hill, CA

Other providers in Walnut Creek

• Alexander Meyer, MD

  Individual Interventional Cardiology Physician · NPI 1639533359

  1425 S Main St, Walnut Creek, CA 94596-5318 · (925) 295-4000

• Mark D Nathan, MD

  Individual Interventional Cardiology Physician · NPI 1013947670

  106 La Casa Via #140, Walnut Creek, CA 94598-3086 · (925) 274-2860

• R. Ryan Platt, MD

  Individual Interventional Cardiology Physician · NPI 1265430417

  1399 Ygnacio Valley Rd 11, Walnut Creek, CA 94598-2884 · (925) 937-1770

• A. William Waibel, MD

  Individual Interventional Cardiology Physician · NPI 1992857700

  1425 S Main St, Walnut Creek, CA 94596-5318 · (925) 295-4000