Dr. John Karl Konstantin, MD, MPH
- Medicare services, 2024
- 286
- Medicare patients, 2024
- 65
- Part D claims, 2024
- 1,130
- Hospital affiliations
- 3
- Industry payments
- $257
- 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. Konstantin's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Karl Konstantin is a general practice physician in Walnut Creek, California
Dr. Konstantin practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health.
Dr. Konstantin's NPI, 1548415979, was assigned on November 26, 2008. Dr. Konstantin graduated from Drexel University College Of Medicine in 2006. Dr. Konstantin holds California license A102896.
- NPI
- 1548415979NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638343510
- NPI enumeration date
- November 26, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (925) 939-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Karl Konstantin practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California
Dr. Konstantin'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. John Karl Konstantin is affiliated with 3 sites of care
Dr. Konstantin's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dr. Konstantin is also affiliated with Stanford Hospital at 300 Pasteur Drive. Dmand AI also links Dr. Konstantin to 1 more hospital, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Karl Konstantin's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Konstantin 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 affiliated sites | 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. John Karl Konstantin is one of 1,526 general practice physicians in California
General practice is Dr. Konstantin's primary specialty in the NPI Registry, under taxonomy code 208D00000X. Dr. Konstantin is licensed in California.
Specialties and state licenses
- General practice, CaliforniaPrimary
Clinical focus
Dmand AI lists acute kidney failure, acute skin infection, aneurysm, anxiety, asthma, atrial fibrillation and flutter, bursitis and chronic diabetes among the conditions Dr. Konstantin treats.
General practice physicians near Dr. Konstantin
Counts of general practice physicians 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. John Karl Konstantin billed Medicare for 286 services in 2024
CMS data shows 286 Medicare services from Dr. Konstantin across 2 procedure codes in 2024, for 65 Medicare patients. Medicare paid $24,040 for them. Every service was in an office.
Dr. Konstantin's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2632024: 2505%
- Other services
- 2023: 162024: 36125%
Dr. Konstantin compared with the California median for general practice physicians, 2024
- Dr. Konstantin
- California median
- Medicare services
- 286vs 2629% above
- Medicare patients
- 65vs 13652% below
- Part D claims
- 818vs 1924.3 times
Medians across 1,114 general practice physicians in California with Dmand AI profiles that report each measure.
Dr. Konstantin's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Konstantin?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Konstantin and other general practice physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Karl Konstantin treated 65 Medicare patients in 2024, average age 72
CMS counts 65 Medicare patients who saw Dr. Konstantin in 2024. The largest group is 65 to 74, with 33 patients. 74% of them have high blood pressure, and 51% have high cholesterol. 45% are also on Medicaid. Their average risk score is 0.87, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Konstantin's median patient age at 69, with 31% women.
Dr. Konstantin's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Konstantin's Medicare patients by sex, 2024
- Women2132%
- Men4468%
Chronic conditions among Dr. Konstantin's Medicare patients, 2024
- High blood pressure74%
- High cholesterol51%
- Diabetes46%
- Anxiety22%
- Chronic kidney disease17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Konstantin's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women31%
- Men66%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Karl Konstantin wrote 1,130 Medicare Part D claims in 2024
In 2024, Dr. Konstantin wrote 1,130 Medicare Part D claims for 91 patients. 85% of them were for generic drugs. CMS names the drug for 818 of them, across 33 drugs with 11 or more claims each, at $38,457 in total drug cost. In 2023, CMS named 878 claims across 37 drugs.
Dr. Konstantin's Part D claims by kind of drug, 2024
- Generic966 claims85%
- Brand-name151 claims13%
- Other13 claims1%
Dr. Konstantin'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. Konstantin's Part D claims, 2024
- Opioids1%13 of 1,130 claims
- Antibiotics8%90 of 1,130 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: 8782024: 8187%
Drugs named by CMS: 33 in 2024, 37 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
How Dr. John Karl Konstantin takes part in Medicare
Dr. Konstantin accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. John Karl Konstantin received $257 in industry payments from 2016 to 2024
CMS Open Payments shows 5 general payments to Dr. Konstantin from 4 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Organogenesis Inc. paid the most, $108.
General payments to Dr. Konstantin by program year, 2016 to 2024
Companies that paid Dr. Konstantin the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Karl Konstantin graduated from Drexel University College Of Medicine
Dr. Konstantin graduated from Drexel University College Of Medicine in 2006.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. John Karl Konstantin accepts plans from 1 insurance carrier
Dr. Konstantin is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. John Karl Konstantin'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 services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. John Karl Konstantin
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. John Karl Konstantin's NPI number?
Dr. John Karl Konstantin's NPI number is 1548415979. It was assigned on November 26, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. John Karl Konstantin?
Dr. John Karl Konstantin is a general practice physician in Walnut Creek, California. The primary specialty in the NPI Registry is General Practice Physician (taxonomy code 208D00000X).
Where does Dr. John Karl Konstantin practice?
Dr. Konstantin practices at 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598. Dr. Konstantin's primary practice is John Muir Medical Center, Walnut Creek in Walnut Creek, California, part of John Muir Health. Dmand AI also links Dr. Konstantin to 1 hospital.
What is Dr. John Karl Konstantin's office phone number?
The practice phone on file for Dr. Konstantin is (925) 939-3000.
What is Dr. John Karl Konstantin's medical license number?
Dr. Konstantin holds California license A102896.
Which hospitals is Dr. John Karl Konstantin affiliated with?
Dr. Konstantin practices at John Muir Medical Center, Walnut Creek in Walnut Creek, California. Dr. Konstantin is also affiliated with Stanford Hospital at 300 Pasteur Drive. Dmand AI links Dr. Konstantin to 1 more hospital.
Does Dr. John Karl Konstantin accept Medicare?
Yes. CMS data shows Dr. Konstantin billed Medicare for 286 services in 2024, and Dr. Konstantin accepts Medicare assignment.
How many Medicare patients does Dr. John Karl Konstantin see?
CMS counts 65 Medicare patients who saw Dr. Konstantin in 2024, with an average age of 72.
What services does Dr. John Karl Konstantin bill to Medicare?
In 2024, Dr. Konstantin's most billed Medicare services were office visit, established patient (99213) and medicare service (G0439).
Where did Dr. John Karl Konstantin go to medical school?
Dr. Konstantin graduated from Drexel University College Of Medicine in 2006.
Show 4 more questionsShow fewer questions
What drugs does Dr. John Karl Konstantin prescribe most?
In 2024 Medicare Part D data, Dr. Konstantin's most prescribed drugs by claims were Atorvastatin Calcium, Omeprazole and Glipizide.
Has Dr. John Karl Konstantin received payments from drug or device companies?
CMS Open Payments shows $257 in general payments to Dr. Konstantin from 4 companies from 2016 to 2024. The largest total came from Organogenesis Inc.
How long has Dr. John Karl Konstantin been practicing?
Dr. Konstantin graduated from medical school in 2006, 20 years ago.
What insurance does Dr. John Karl Konstantin accept?
Dr. Konstantin is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
Selling to general practice practices?
See general practice physicians in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card