Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Christopher A Walter, DO

Individual provider Orthopaedic Surgery Physician · NPI 1447420732

Christopher A Walter, DO practises Orthopedic Surgery in Sonoma, California. Graduated from College of Osteopathic Physicians and Surgeons of Los Angeles in 2004, 22 years ago. Practices with Regents Univ of California UCSF, a 272-clinician group and works from 2 locations. Licensed in California.

Years since qualifying
22
Trained at
College of Osteopathic Physicians and Surgeons of Los Angeles
Licensed in
CA
In the registry since
2008
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

347 Andrieux St
Sonoma, CA 95476-6811
Phone: (707) 721-8830
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 335 S McDowell Blvd, Petaluma, CA 94954-3507 — (707) 721-8830

Specialties & licences

Orthopaedic Surgery Physician (primary) Taxonomy 207X00000X · Licence 20A10826 (CA)

Record details

NPI number1447420732
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 3, 2008
Last updated in NPPESMarch 13, 2026
Certification dateMarch 13, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolCOLLEGE OF OSTEOPATHIC PHYSICIANS AND SURGEONS OF LOS ANGELES
Graduated 2004 (22 years in practice)
Group practice Regents Univ Of California Ucsf — 272 clinicians
Accepts Medicare assignment Not indicated

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.

Lower limb (leg) arthroscopy (minimally invasive joint repair) 20 times · 92nd percentile
Hip replacement 15 times · 59th percentile
Knee replacement 18 times · 49th percentile
Upper limb (arm) arthroscopy (minimally invasive joint repair) 11 times · 46th percentile

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.

Medicare patients296
Services billed 2,085 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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.

Food and Beverage $391 6 payments · a meal or drink at a meeting or visit, not a fee

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. Those with a page here are linked.

Colleagues at Regents Univ of California UCSF

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 272 clinicians in the practice; 12 are shown here.

Other providers in Sonoma