Dr. Christopher A. Simmons, MD

Dr. Simmons practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health.

Dr. Simmons' NPI, 1083630081, was assigned on July 14, 2006. Dr. Simmons graduated from UTMB Health in 1991. Dr. Simmons' California license number on file is A52899.

Dr. Simmons' primary practice is John Muir Medical Center, Walnut Creek, at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598 in Contra Costa County. The practice phone is (925) 939-3000.

Dr. Simmons' primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dr. Simmons is also affiliated with Alta Bates Summit Medical Center. Dmand AI also links Dr. Simmons to 2 more hospitals, 3 home health agencies and 1 physician office, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Simmons practices, 8 sites in all. Vendor and product names are available with a free account.

Internal medicine is Dr. Simmons' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Simmons has a license on file in California.

Dmand AI lists acid reflux, acute mini-stroke (TIA), acute sinusitis, acute skin infection, alcohol use disorders, alzheimer's disease, aneurysm and ankle or foot injury among the conditions Dr. Simmons treats.

CMS data shows 1,485 Medicare services from Dr. Simmons across 10 procedure codes in 2024, for 275 Medicare patients. Medicare paid $131,877 for them. Every service was in an office.

CMS counts 275 Medicare patients who saw Dr. Simmons in 2024. The largest group is 75 to 84, with 132 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.09, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Dr. Simmons' median patient age at 77, with 45% women.

In 2024, Dr. Simmons wrote 5,647 Medicare Part D claims for 312 patients. 84% of them were for generic drugs. CMS names the drug for 4,925 of them, across 103 drugs with 11 or more claims each, at $645,541 in total drug cost. In 2023, CMS named 5,554 claims across 106 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 90 out of 100 for Dr. Simmons for performance year 2024, reported as part of a group. Dr. Simmons accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Simmons as offering telehealth. CMS counts 11 procedures of removal or shaving of skin growth by Dr. Simmons, more than 64% of the clinicians it reports for that procedure.

Removal of nail tissue: 1 to 10 procedures (CMS shows small counts as a range)

Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)

CMS Open Payments shows 108 general payments to Dr. Simmons from 21 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 69% of the total. Eli Lilly and Company paid the most, $875.

Dr. Simmons graduated from UTMB Health in 1991.

Dr. Simmons is in network with 13 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.