Dr. Donald J. Hermens, MD
- Medicare services, 2016
- 438
- Medicare patients, 2024
- 15
- Part D claims, 2024
- 1,787
- Publications
- 1
- Hospital affiliations
- 1
- Practice address
- 7300 North Fresno St, Fresno, CA 93720
- Practice phone
- Call (559) 448-4500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Hermens' 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. Donald J. Hermens is a gastroenterologist in Fresno, California
Dr. Hermens practices at Kaiser Permanente Fresno Medical Center in Fresno, California, part of Kaiser Permanente.
Dr. Hermens' NPI, 1962475442, was assigned on February 7, 2006. Dr. Hermens graduated from Creighton University School of Medicine - Omaha in 1985. Dr. Hermens' Illinois license number on file is 036101026.
- NPI
- 1962475442NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8921134156
- NPI enumeration date
- February 7, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (559) 448-4500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Donald J. Hermens practices at Kaiser Permanente Fresno Medical Center in Fresno, California
Dr. Hermens' primary practice is Kaiser Permanente Fresno Medical Center, at 7300 North Fresno St, Fresno, CA 93720 in Fresno County. The practice phone is (559) 448-4500.
- Kaiser Permanente Fresno Medical Center7300 North Fresno St, Fresno, CA 93720 · Fresno CountyPhone(559) 448-4500
Source: Dmand AI Affiliation Data
Dr. Donald J. Hermens is affiliated with 1 site of care and 1 medical group
Dr. Hermens' primary practice is Kaiser Permanente Fresno Medical Center in Fresno, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Donald J. Hermens' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hermens practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente Fresno Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Donald J. Hermens is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Hermens' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Hermens is board certified in gastroenterology by the American Board of Internal Medicine. Dmand AI has Dr. Hermens' licenses on file in 2 states: Illinois and California.
Specialties and state licenses
- Gastroenterology, IllinoisPrimary
- California license
Clinical focus
Dmand AI lists colonoscopy among the conditions Dr. Hermens treats.
Gastroenterologists near Dr. Hermens
Counts of gastroenterologists 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. Donald J. Hermens billed Medicare for 438 services in 2016
CMS data shows 438 Medicare services from Dr. Hermens across 11 procedure codes in 2016, for 15 Medicare patients. Medicare paid $39,420 for them.
Dr. Hermens' Medicare services by type, 2016
- Surgery215
- Office and hospital visits211
- Other services12
Where Dr. Hermens' Medicare services took place, 2016
- In an office19144%
- In a facility24756%
Dr. Hermens compared with the California median for gastroenterologists, 2016
- Dr. Hermens
- California median
- Medicare services
- 438vs 58625% below
- Medicare patients
- 15vs 30295% below
- Part D claims
- 1,553vs 3804.1 times
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Hermens' most billed Medicare procedure codes, 2016
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. Hermens?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hermens and other gastroenterologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Donald J. Hermens treated 15 Medicare patients in 2024, average age 69
CMS counts 15 Medicare patients who saw Dr. Hermens in 2024. Their average risk score is 2.36, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Hermens' median patient age at 66, with 71% women.
Dr. Hermens' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women71%
- Men29%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Donald J. Hermens wrote 1,787 Medicare Part D claims in 2024
In 2024, Dr. Hermens wrote 1,787 Medicare Part D claims for 842 patients. 89% of them were for generic drugs. CMS names the drug for 1,553 of them, across 28 drugs with 11 or more claims each, at $209,237 in total drug cost. In 2023, CMS named 1,489 claims across 25 drugs.
Dr. Hermens' Part D claims by kind of drug, 2024
- Generic1,593 claims89%
- Brand-name and other194 claims11%
Dr. Hermens' 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. Hermens' Part D claims, 2024
- Antibiotics3%57 of 1,787 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: 1,4892024: 1,5534%
Drugs named by CMS: 28 in 2024, 25 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. Donald J. Hermens takes part in Medicare
Dr. Hermens accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Donald J. Hermens has 1 publication on record
Dmand AI links 1 paper to Dr. Hermens.
Recent publications by Dr. Hermens
See who Dr. Hermens researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hermens works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Donald J. Hermens received $181 in industry payments from 2016 to 2024
CMS Open Payments shows 5 general payments to Dr. Hermens from 2 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $163.
General payments to Dr. Hermens by program year, 2016 to 2024
Companies that paid Dr. Hermens 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. Donald J. Hermens graduated from Creighton University School of Medicine - Omaha
Dr. Hermens graduated from Creighton University School of Medicine - Omaha in 1985.
- Medical school
- Board certified in gastroenterology
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Donald J. Hermens accepts plans from 4 insurance carriers
Dr. Hermens is in network with 4 carriers, including Kaiser Permanente, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Kaiser Permanente
- Blue Cross Blue Shield of Massachusetts
- HCSC
- CMS Medicare
Plan types Dr. Hermens accepts, by number of carriers
- Medicare3
- PPO2
- EPO1
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Donald J. Hermens'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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Donald J. Hermens
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. Donald J. Hermens' NPI number?
Dr. Donald J. Hermens' NPI number is 1962475442. It was assigned on February 7, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Donald J. Hermens?
Dr. Donald J. Hermens is a gastroenterologist in Fresno, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Donald J. Hermens practice?
Dr. Hermens practices at 7300 North Fresno St, Fresno, CA 93720. Dr. Hermens' primary practice is Kaiser Permanente Fresno Medical Center in Fresno, California, part of Kaiser Permanente.
What is Dr. Donald J. Hermens' office phone number?
The practice phone on file for Dr. Hermens is (559) 448-4500.
What is Dr. Donald J. Hermens' medical license number?
Dr. Hermens' Illinois license number on file is 036101026, one of the licenses on file in 2 states.
Which states has Dr. Donald J. Hermens been licensed in?
Dmand AI has state licenses on file for Dr. Hermens in Illinois (1999 to 2014) and California (2013 to 2025).
Which hospitals is Dr. Donald J. Hermens affiliated with?
Dr. Hermens practices at Kaiser Permanente Fresno Medical Center in Fresno, California.
What medical group is Dr. Donald J. Hermens part of?
Dr. Hermens is linked to The Permanente Medical Group, Inc.
Does Dr. Donald J. Hermens accept Medicare?
Yes. CMS data shows Dr. Hermens billed Medicare for 438 services in 2016, and Dr. Hermens accepts Medicare assignment.
How many Medicare patients does Dr. Donald J. Hermens see?
CMS counts 15 Medicare patients who saw Dr. Hermens in 2024, with an average age of 69.
Show 8 more questionsShow fewer questions
Is Dr. Donald J. Hermens board certified?
Yes. Dr. Hermens is board certified in gastroenterology by the American Board of Internal Medicine.
What services does Dr. Donald J. Hermens bill to Medicare?
In 2016, Dr. Hermens' most billed Medicare services were office visit, established patient (99213), office visit, new patient (99203) and surgery: digestive system (45380).
Where did Dr. Donald J. Hermens go to medical school?
Dr. Hermens graduated from Creighton University School of Medicine - Omaha in 1985.
What drugs does Dr. Donald J. Hermens prescribe most?
In 2024 Medicare Part D data, Dr. Hermens' most prescribed drugs by claims were Gavilyte-C, Pantoprazole Sodium and Budesonide DR.
Has Dr. Donald J. Hermens received payments from drug or device companies?
CMS Open Payments shows $181 in general payments to Dr. Hermens from 2 companies from 2016 to 2024. The largest total came from Boston Scientific Corporation.
How long has Dr. Donald J. Hermens been practicing?
Dr. Hermens graduated from medical school in 1985, 41 years ago.
Does Dr. Donald J. Hermens do research?
Dmand AI links 1 publication to Dr. Hermens.
What insurance does Dr. Donald J. Hermens accept?
Dr. Hermens is in network with 4 carriers, including Kaiser Permanente, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
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