Dr. Michael Christopher Gynn, MD
- Part D claims, 2024
- 93
- Hospital affiliations
- 3
- Industry payments
- $4,360
- Medical groups
- 3
- Insurance carriers
- 2
- Practice address
- 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
- Practice phone
- Call (925) 939-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Gynn's professional email, personal email and mobile number
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Dr. Michael Christopher Gynn is a general surgeon in Walnut Creek, California
Dr. Gynn practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health.
Dr. Gynn's NPI, 1366462491, was assigned on July 20, 2006. Dr. Gynn graduated from University of North Carolina School of Medicine in 1999. Dr. Gynn's California license number on file is A79766.
- NPI
- 1366462491NPI Registry (opens in a new tab)
- NPI enumeration date
- July 20, 2006
- NPI status
- Active
- Practice phone
- (925) 939-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Michael Christopher Gynn practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California
Dr. Gynn's 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.
- John Muir Medical Center, Walnut Creek1601 Ygnacio Valley Rd, Walnut Creek, CA 94598 · Contra Costa CountyPhone(925) 939-3000
Source: Dmand AI Affiliation Data
Dr. Michael Christopher Gynn is affiliated with 3 sites of care and 3 medical groups
Dr. Gynn's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dr. Gynn is also affiliated with Stanford Health Care Tri-Valley. The medical group on file is Stanford Health Care. Dmand AI also links Dr. Gynn to 1 more hospital and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael Christopher Gynn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gynn practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| John Muir Medical Center, Walnut Creek | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across John Muir Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Michael Christopher Gynn is one of 2,926 general surgeons in California
Surgery is Dr. Gynn's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Gynn is board certified in surgery by the American Board of Surgery. Dr. Gynn has a license on file in California.
Specialties and state licenses
- Surgery, CaliforniaPrimary
Clinical focus
Dmand AI lists abdominal hernia repair surgery, colon removal, gallbladder removal and mastectomy among the conditions Dr. Gynn treats.
General surgeons near Dr. Gynn
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Michael Christopher Gynn's patients have a median age of 59
Across all payers, Dmand AI patient panel data puts Dr. Gynn's median patient age at 59, with 69% women.
Dr. Gynn's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women69%
- Men31%
Source: Dmand AI Patient Panel Data
Dr. Michael Christopher Gynn wrote 93 Medicare Part D claims in 2024
In 2024, Dr. Gynn wrote 93 Medicare Part D claims for 42 patients. 95% of them were for generic drugs. CMS names the drug for 31 of them, across 2 drugs with 11 or more claims each, at $136 in total drug cost. In 2023, CMS named 36 claims across 3 drugs.
Dr. Gynn's Part D claims by kind of drug, 2024
- Generic88 claims95%
- Brand-name and other5 claims5%
Dr. Gynn's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Gynn's Part D claims, 2024
- Opioids20%19 of 93 claims
- Antibiotics19%18 of 93 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 362024: 3114%
Drugs named by CMS: 2 in 2024, 3 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Michael Christopher Gynn received $4,360 in industry payments from 2016 to 2025
CMS Open Payments shows 34 general payments to Dr. Gynn from 7 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 82% of the total. Davol Inc. paid the most, $1,971.
General payments to Dr. Gynn by program year, 2016 to 2025
General payments to Dr. Gynn by kind, 2016 to 2025
- Travel and lodging$3,58182%
- Food and beverage$69516%
- Education$852%
Companies that paid Dr. Gynn the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael Christopher Gynn has 1 award and honors on record
Dmand AI lists 1 award for Dr. Gynn.
Awards and honors for Dr. Gynn
- Undated
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. Michael Christopher Gynn graduated from University of North Carolina School of Medicine
Dr. Gynn graduated from University of North Carolina School of Medicine in 1999. Dr. Gynn is a member of ACS.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Michael Christopher Gynn accepts plans from 2 insurance carriers
Dr. Gynn is in network with 2 carriers, including Aetna and Blue Cross and Blue Shield of Kansas City. EPO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Aetna
- Blue Cross and Blue Shield of Kansas City
Plan types Dr. Gynn accepts, by number of carriers
- EPO2
- HMO1
- Medicare1
- POS1
- PPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Michael Christopher Gynn's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Michael Christopher Gynn
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Michael Christopher Gynn's NPI number?
Dr. Michael Christopher Gynn's NPI number is 1366462491. It was assigned on July 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Christopher Gynn?
Dr. Michael Christopher Gynn is a general surgeon in Walnut Creek, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Michael Christopher Gynn practice?
Dr. Gynn practices at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598. Dr. Gynn's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dmand AI also links Dr. Gynn to 1 hospital and 2 medical groups.
What is Dr. Michael Christopher Gynn's office phone number?
The practice phone on file for Dr. Gynn is (925) 939-3000.
What is Dr. Michael Christopher Gynn's medical license number?
Dr. Gynn's California license number on file is A79766.
Which hospitals is Dr. Michael Christopher Gynn affiliated with?
Dr. Gynn practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California. Dr. Gynn is also affiliated with Stanford Health Care Tri-Valley. Dmand AI links Dr. Gynn to 1 more hospital.
What medical group is Dr. Michael Christopher Gynn part of?
Dr. Gynn is linked to Stanford Health Care. Dmand AI links Dr. Gynn to 2 more medical groups.
Is Dr. Michael Christopher Gynn board certified?
Yes. Dr. Gynn is board certified in surgery by the American Board of Surgery.
Where did Dr. Michael Christopher Gynn go to medical school?
Dr. Gynn graduated from University of North Carolina School of Medicine in 1999.
What drugs does Dr. Michael Christopher Gynn prescribe most?
In 2024 Medicare Part D data, Dr. Gynn's most prescribed drugs by claims were Hydrocodone-Acetaminophen and Ibuprofen.
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Has Dr. Michael Christopher Gynn received payments from drug or device companies?
CMS Open Payments shows $4,360 in general payments to Dr. Gynn from 7 companies from 2016 to 2025. The largest total came from Davol Inc.
How long has Dr. Michael Christopher Gynn been practicing?
Dr. Gynn graduated from medical school in 1999, 27 years ago.
What insurance does Dr. Michael Christopher Gynn accept?
Dr. Gynn is in network with 2 carriers, including Aetna and Blue Cross and Blue Shield of Kansas City. EPO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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