Dr. Mark Thomas Ewing, MD
- Part D claims, 2024
- 1,106
- Hospital affiliations
- 1
- Industry payments
- $88
- Medical group
- 1
- Insurance carriers
- 2
- Practice address
- 5601 De Soto Avenue, Woodland Hills, CA 91367
- Practice phone
- Call (818) 719-3800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Ewing's professional email, personal email and mobile number
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Dr. Mark Thomas Ewing is a gastroenterologist in Woodland Hills, California
Dr. Ewing practices at Kaiser Permanente Woodland Hills Medical Center in Woodland Hills, California, part of Kaiser Permanente.
Dr. Ewing's NPI, 1023166816, was assigned on January 8, 2007. Dr. Ewing graduated from Keck School of Medicine of USC in 1999. Dr. Ewing holds California license A74992.
- NPI
- 1023166816NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5496780082
- NPI enumeration date
- January 8, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (818) 719-3800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Thomas Ewing practices at Kaiser Permanente Woodland Hills Medical Center in Woodland Hills, California
Dr. Ewing's primary practice is Kaiser Permanente Woodland Hills Medical Center, at 5601 De Soto Avenue, Woodland Hills, CA 91367 in Los Angeles County. The practice phone is (818) 719-3800.
- Kaiser Permanente Woodland Hills Medical Center5601 De Soto Avenue, Woodland Hills, CA 91367 · Los Angeles CountyPhone(818) 719-3800
Source: Dmand AI Affiliation Data
Dr. Mark Thomas Ewing is affiliated with 2 sites of care and 1 medical group
Dr. Ewing's primary practice is Kaiser Permanente Woodland Hills Medical Center in Woodland Hills, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Ewing to 1 more dialysis center, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Thomas Ewing's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ewing practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente Woodland Hills Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Thomas Ewing is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Ewing's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Ewing is board certified in gastroenterology by the American Board of Internal Medicine. Dr. Ewing is licensed in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Gastroenterologists near Dr. Ewing
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. Mark Thomas Ewing's patients have a median age of 61
Across all payers, Dmand AI patient panel data puts Dr. Ewing's median patient age at 61, with 56% women.
Dr. Ewing's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women56%
- Men42%
Source: Dmand AI Patient Panel Data
Dr. Mark Thomas Ewing wrote 1,106 Medicare Part D claims in 2024
In 2024, Dr. Ewing wrote 1,106 Medicare Part D claims for 483 patients. 83% of them were for generic drugs. CMS names the drug for 981 of them, across 22 drugs with 11 or more claims each, at $234,959 in total drug cost. In 2023, CMS named 967 claims across 21 drugs.
Dr. Ewing's Part D claims by kind of drug, 2024
- Generic918 claims83%
- Brand-name188 claims17%
Dr. Ewing'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. Ewing's Part D claims, 2024
- Antibiotics4%48 of 1,106 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: 9672024: 9811%
Drugs named by CMS: 22 in 2024, 21 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. Mark Thomas Ewing takes part in Medicare
Dr. Ewing 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. Mark Thomas Ewing received $88 in industry payments in 2017
CMS Open Payments shows 1 general payment to Dr. Ewing from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Medivators Inc. paid the most, $88.
Companies that paid Dr. Ewing the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Thomas Ewing has 1 award and honors on record
Dmand AI lists 1 award for Dr. Ewing, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Ewing
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. Mark Thomas Ewing graduated from Keck School of Medicine of USC
Dr. Ewing graduated from Keck School of Medicine of USC in 1999.
- Medical school
- Board certified in gastroenterology
Source: Dmand AI Professional Profile Data
Dr. Mark Thomas Ewing accepts plans from 2 insurance carriers
Dr. Ewing is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Ewing accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Mark Thomas Ewing'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) |
| 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) |
| 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. Mark Thomas Ewing
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. Mark Thomas Ewing's NPI number?
Dr. Mark Thomas Ewing's NPI number is 1023166816. It was assigned on January 8, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Thomas Ewing?
Dr. Mark Thomas Ewing is a gastroenterologist in Woodland Hills, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Mark Thomas Ewing practice?
Dr. Ewing practices at 5601 De Soto Avenue, Woodland Hills, CA 91367. Dr. Ewing's primary practice is Kaiser Permanente Woodland Hills Medical Center in Woodland Hills, California, part of Kaiser Permanente. Dmand AI also links Dr. Ewing to 1 dialysis center.
What is Dr. Mark Thomas Ewing's office phone number?
The practice phone on file for Dr. Ewing is (818) 719-3800.
What is Dr. Mark Thomas Ewing's medical license number?
Dr. Ewing holds California license A74992.
Which hospitals is Dr. Mark Thomas Ewing affiliated with?
Dr. Ewing practices at Kaiser Permanente Woodland Hills Medical Center in Woodland Hills, California.
What medical group is Dr. Mark Thomas Ewing part of?
Dr. Ewing is linked to Southern California Permanente Medical Group.
Does Dr. Mark Thomas Ewing accept Medicare?
Yes. CMS lists Dr. Ewing as accepting Medicare assignment.
Is Dr. Mark Thomas Ewing board certified?
Yes. Dr. Ewing is board certified in gastroenterology by the American Board of Internal Medicine.
Where did Dr. Mark Thomas Ewing go to medical school?
Dr. Ewing graduated from Keck School of Medicine of USC in 1999.
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What drugs does Dr. Mark Thomas Ewing prescribe most?
In 2024 Medicare Part D data, Dr. Ewing's most prescribed drugs by claims were Gavilyte-C, Omeprazole and Mesalamine.
Has Dr. Mark Thomas Ewing received payments from drug or device companies?
CMS Open Payments shows $88 in general payments to Dr. Ewing from 1 company from 2017 to 2017. The largest total came from Medivators Inc.
How long has Dr. Mark Thomas Ewing been practicing?
Dr. Ewing graduated from medical school in 1999, 27 years ago.
What insurance does Dr. Mark Thomas Ewing accept?
Dr. Ewing is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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