Dr. Mark Patrick Lewis, MD
- Medicare services, 2024
- 1,780
- Medicare patients, 2024
- 443
- Part D claims, 2024
- 5,377
- MIPS score, 2024
- 23
- Hospital affiliations
- 3
- Practice address
- 2500 Grant Road, Mountain View, CA 94040
- Practice phone
- Call (650) 940-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Mark Patrick Lewis is an internist in Mountain View, California
Dr. Lewis practices at El Camino Health - Mountain View Hospital in Mountain View, California, part of El Camino Healthcare District.
Dr. Lewis' NPI, 1891985800, was assigned on July 26, 2007. Dr. Lewis graduated from University of Southern California Keck School of Medicine in 2005. Dr. Lewis holds California license A96667.
- NPI
- 1891985800NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0840353108
- NPI enumeration date
- July 26, 2007
- NPI status
- Active
- Offers telehealth
- Yes
- Practice phone
- (650) 940-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Patrick Lewis practices at El Camino Health - Mountain View Hospital in Mountain View, California
Dr. Lewis' primary practice is El Camino Health - Mountain View Hospital, at 2500 Grant Road, Mountain View, CA 94040 in Santa Clara County. The practice phone is (650) 940-7000.
- El Camino Health - Mountain View Hospital2500 Grant Road, Mountain View, CA 94040 · Santa Clara CountyPhone(650) 940-7000
Source: Dmand AI Affiliation Data
Dr. Mark Patrick Lewis is affiliated with 10 sites of care
Dr. Lewis' primary practice is El Camino Health - Mountain View Hospital in Mountain View, California, part of El Camino Healthcare District. Dr. Lewis is also affiliated with Stanford Hospital at 300 Pasteur Drive. Dmand AI also links Dr. Lewis to 1 more hospital, 5 home health agencies and 2 hospital outpatient departments, 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. Mark Patrick Lewis' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lewis practices, 10 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| El Camino Health - Mountain View Hospital | Available with a free account |
| +9 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 El Camino Healthcare District and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mark Patrick Lewis is one of 16,751 internists in California
Internal medicine is Dr. Lewis' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Lewis is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Lewis
Counts of internists 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 Patrick Lewis billed Medicare for 1,780 services in 2024
CMS data shows 1,780 Medicare services from Dr. Lewis across 13 procedure codes in 2024, for 443 Medicare patients. Medicare paid $132,800 for them.
Dr. Lewis' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,4392024: 1,65715%
- Other services
- 2023: 602024: 647%
- Tests and treatments
- 2023: 602024: 4722%
- Surgery
- 2023: 132024: 128%
Where Dr. Lewis' Medicare services took place, 2024
- In an office1,23769%
- In a facility54331%
Dr. Lewis compared with the California median for internists, 2024
- Dr. Lewis
- California median
- Medicare services
- 1,780vs 3614.9 times
- Medicare patients
- 443vs 1512.9 times
- Part D claims
- 4,660vs 42111.1 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Lewis' 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Lewis and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Patrick Lewis treated 443 Medicare patients in 2024, average age 80
CMS counts 443 Medicare patients who saw Dr. Lewis in 2024. The largest group is 75 to 84, with 188 patients. 75% of them have high cholesterol, and 68% have high blood pressure. Their average risk score is 1.01, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Lewis' median patient age at 81, with 57% women.
Dr. Lewis' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Lewis' Medicare patients by sex, 2024
- Women23252%
- Men21148%
Chronic conditions among Dr. Lewis' Medicare patients, 2024
- High cholesterol75%
- High blood pressure68%
- Osteoporosis49%
- Diabetes46%
- Arthritis39%
- Ischemic heart disease33%
- Atrial fibrillation21%
- Cancer19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Lewis' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 81
Patient panel by sex, all payers
- Women57%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Patrick Lewis wrote 5,377 Medicare Part D claims in 2024
In 2024, Dr. Lewis wrote 5,377 Medicare Part D claims for 409 patients. 86% of them were for generic drugs. CMS names the drug for 4,660 of them, across 95 drugs with 11 or more claims each, at $353,240 in total drug cost. In 2023, CMS named 4,275 claims across 93 drugs.
Dr. Lewis' Part D claims by kind of drug, 2024
- Generic4,622 claims86%
- Brand-name721 claims13%
- Other34 claims1%
Dr. Lewis' 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. Lewis' Part D claims, 2024
- Opioids3%153 of 5,377 claims
- Antibiotics4%203 of 5,377 claims
- Antipsychotics, patients 65 and over2%95 of 5,377 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: 4,2752024: 4,6609%
Drugs named by CMS: 95 in 2024, 93 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
Dr. Mark Patrick Lewis scored 23 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 23 out of 100 for Dr. Lewis for performance year 2024, reported individually. CMS lists Dr. Lewis as offering telehealth.
- Offers telehealth
- Yes
Dr. Lewis' MIPS scores, performance year 2024
- 23of 100Final score
- 0of 100Quality
- 0of 100Improvement Activities
- 77of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Mark Patrick Lewis received $718 in industry payments from 2016 to 2025
CMS Open Payments shows 21 general payments to Dr. Lewis from 11 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. Stryker Corporation paid the most, $243.
General payments to Dr. Lewis by program year, 2016 to 2025
General payments to Dr. Lewis by kind, 2016 to 2025
- Food and beverage$70198%
- Education$172%
Companies that paid Dr. Lewis 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. Mark Patrick Lewis graduated from University of Southern California Keck School of Medicine
Dr. Lewis graduated from University of Southern California Keck School of Medicine in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark Patrick Lewis'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)Clinician Public Reporting: Overall MIPS Performance (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 |
| 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 Patrick Lewis
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 Patrick Lewis' NPI number?
Dr. Mark Patrick Lewis' NPI number is 1891985800. It was assigned on July 26, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Patrick Lewis?
Dr. Mark Patrick Lewis is an internist in Mountain View, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark Patrick Lewis practice?
Dr. Lewis practices at 2500 Grant Road, Mountain View, CA 94040. Dr. Lewis' primary practice is El Camino Health - Mountain View Hospital in Mountain View, California, part of El Camino Healthcare District. Dmand AI also links Dr. Lewis to 1 hospital, 5 home health agencies and 2 hospital outpatient departments.
What is Dr. Mark Patrick Lewis' office phone number?
The practice phone on file for Dr. Lewis is (650) 940-7000.
What is Dr. Mark Patrick Lewis' medical license number?
Dr. Lewis holds California license A96667.
Which hospitals is Dr. Mark Patrick Lewis affiliated with?
Dr. Lewis practices at El Camino Health - Mountain View Hospital in Mountain View, California. Dr. Lewis is also affiliated with Stanford Hospital at 300 Pasteur Drive. Dmand AI links Dr. Lewis to 1 more hospital.
Does Dr. Mark Patrick Lewis accept Medicare?
Yes. CMS data shows Dr. Lewis billed Medicare for 1,780 services in 2024.
Does Dr. Mark Patrick Lewis offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Lewis as offering telehealth services.
What is Dr. Mark Patrick Lewis' MIPS score?
Dr. Lewis' MIPS final score for performance year 2024 is 23 out of 100, reported individually.
How many Medicare patients does Dr. Mark Patrick Lewis see?
CMS counts 443 Medicare patients who saw Dr. Lewis in 2024, with an average age of 80.
Show 5 more questionsShow fewer questions
What services does Dr. Mark Patrick Lewis bill to Medicare?
In 2024, Dr. Lewis' most billed Medicare services were office visit, established patient (99213), hospital inpatient care (99232) and office visit, established patient (99215).
Where did Dr. Mark Patrick Lewis go to medical school?
Dr. Lewis graduated from University of Southern California Keck School of Medicine in 2005.
What drugs does Dr. Mark Patrick Lewis prescribe most?
In 2024 Medicare Part D data, Dr. Lewis' most prescribed drugs by claims were Amlodipine Besylate, Atorvastatin Calcium and Levothyroxine Sodium.
Has Dr. Mark Patrick Lewis received payments from drug or device companies?
CMS Open Payments shows $718 in general payments to Dr. Lewis from 11 companies from 2016 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Mark Patrick Lewis been practicing?
Dr. Lewis graduated from medical school in 2005, 21 years ago.
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