Dr. Gregory Michael Lewis, MD
- Medicare services, 2024
- 31
- Medicare patients, 2024
- 18
- Part D claims, 2024
- 422
- Publications
- 1
- Industry payments
- $468
- Practice address
- 7373 West Ln, Stockton, CA 95210
- Practice phone
- Call (209) 476-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Permanente Medical Group Inc
Stockton, California
Find Dr. Lewis' 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. Gregory Michael Lewis is an ophthalmologist in Stockton, California
Dr. Lewis practices at Permanente Medical Group Inc in Stockton, California.
Dr. Lewis' NPI, 1194753301, was assigned on June 28, 2006. Dr. Lewis graduated from University of Tennessee Health Science Center College of Medicine - Memphis in 2001. Dr. Lewis' Georgia license number on file is 074642.
- NPI
- 1194753301NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8123036852
- NPI enumeration date
- June 28, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (209) 476-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory Michael Lewis practices at Permanente Medical Group Inc in Stockton, California
Dr. Lewis' primary practice is Permanente Medical Group Inc, at 7373 West Ln, Stockton, CA 95210 in San Joaquin County. The practice phone is (209) 476-2000.
- Permanente Medical Group Inc7373 West Ln, Stockton, CA 95210 · San Joaquin CountyPhone(209) 476-2000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory Michael Lewis is affiliated with 2 sites of care and 1 medical group
Dr. Lewis' primary practice is Permanente Medical Group Inc in Stockton, California. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Lewis to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory Michael Lewis' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lewis practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Permanente Medical Group Inc | 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. Gregory Michael Lewis is one of 2,621 ophthalmologists in California
Ophthalmology is Dr. Lewis' primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Lewis is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Lewis' licenses on file in 4 states: Georgia, California, Florida and Alabama.
Specialties and state licenses
- Ophthalmology, GeorgiaPrimary
- California license
- Florida license
- Alabama license
Clinical focus
Dmand AI lists retinal occlusion among the conditions Dr. Lewis treats.
Ophthalmologists near Dr. Lewis
Counts of ophthalmologists 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. Gregory Michael Lewis billed Medicare for 31 services in 2024
CMS data shows 31 Medicare services from Dr. Lewis across 1 procedure code in 2024, for 18 Medicare patients. Medicare paid $3,064 for them. Every service was in an office.
Dr. Lewis' Medicare services by type, 2021 to 2024
- 2021
- 2024
- Surgery
- 2021: 02024: 31
- Tests and treatments
- 2021: 232024: 0100%
Dr. Lewis compared with the California median for ophthalmologists, 2024
- Dr. Lewis
- California median
- Medicare services
- 31vs 1,07997% below
- Medicare patients
- 18vs 42196% below
- Part D claims
- 363vs 61841% below
Medians across 2,568 ophthalmologists 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.
Need commercial claims for Dr. Lewis?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Lewis and other ophthalmologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Michael Lewis treated 18 Medicare patients in 2024, average age 68
CMS counts 18 Medicare patients who saw Dr. Lewis in 2024. The largest group is 85 and over, with 0 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 2.54, 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. Lewis' median patient age at 70, with 54% women.
Dr. Lewis' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Lewis' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes72%
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 70
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory Michael Lewis wrote 422 Medicare Part D claims in 2024
In 2024, Dr. Lewis wrote 422 Medicare Part D claims for 137 patients. 65% of them were for generic drugs. CMS names the drug for 363 of them, across 9 drugs with 11 or more claims each, at $12,560 in total drug cost. In 2023, CMS named 414 claims across 9 drugs.
Dr. Lewis' Part D claims by kind of drug, 2024
- Generic275 claims65%
- Brand-name147 claims35%
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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4142024: 36312%
Drugs named by CMS: 9 in 2024, 9 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. Gregory Michael Lewis takes part in Medicare
Dr. Lewis 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)
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Dr. Gregory Michael Lewis has 1 publication on record
Dmand AI links 1 paper to Dr. Lewis in 2019. Dr. Lewis' most frequent co-author is Paul L. Kaufman, MD.
Dr. Lewis' most frequent co-authors
Recent publications by Dr. Lewis
See who Dr. Lewis researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Lewis works with, so you can find a warm path to the right ophthalmologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gregory Michael Lewis received $468 in industry payments from 2016 to 2025
CMS Open Payments shows 18 general payments to Dr. Lewis from 10 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Regeneron Pharmaceuticals, Inc. paid the most, $217.
General payments to Dr. Lewis by program year, 2016 to 2025
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. Gregory Michael Lewis graduated from University of Tennessee Health Science Center College of Medicine - Memphis
Dr. Lewis graduated from University of Tennessee Health Science Center College of Medicine - Memphis in 2001.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. Gregory Michael Lewis accepts plans from 5 insurance carriers
Dr. Lewis is in network with 5 carriers, including Excellus BlueCross BlueShield, Cigna and Kaiser Permanente. HMO plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Excellus BlueCross BlueShield
- Cigna
- Kaiser Permanente
- CMS Medicare
- GA State Medicaid
Plan types Dr. Lewis accepts, by number of carriers
- HMO3
- EPO2
- Medicare2
- POS2
- PPO2
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory Michael 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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) |
| 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. Gregory Michael 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. Gregory Michael Lewis' NPI number?
Dr. Gregory Michael Lewis' NPI number is 1194753301. It was assigned on June 28, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Michael Lewis?
Dr. Gregory Michael Lewis is an ophthalmologist in Stockton, California. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Gregory Michael Lewis practice?
Dr. Lewis practices at 7373 West Ln, Stockton, CA 95210. Dr. Lewis' primary practice is Permanente Medical Group Inc in Stockton, California. Dmand AI also links Dr. Lewis to 1 group practice or clinic.
What is Dr. Gregory Michael Lewis' office phone number?
The practice phone on file for Dr. Lewis is (209) 476-2000.
What is Dr. Gregory Michael Lewis' medical license number?
Dr. Lewis' Georgia license number on file is 074642, one of the licenses on file in 4 states.
Which states has Dr. Gregory Michael Lewis been licensed in?
Dmand AI has state licenses on file for Dr. Lewis in Georgia (2015 to 2021), California (2020 to 2026), Florida (2008 to 2016) and Alabama (2005 to 2008).
What medical group is Dr. Gregory Michael Lewis part of?
Dr. Lewis is linked to The Permanente Medical Group, Inc.
Does Dr. Gregory Michael Lewis accept Medicare?
Yes. CMS data shows Dr. Lewis billed Medicare for 31 services in 2024, and Dr. Lewis accepts Medicare assignment.
How many Medicare patients does Dr. Gregory Michael Lewis see?
CMS counts 18 Medicare patients who saw Dr. Lewis in 2024, with an average age of 68.
Is Dr. Gregory Michael Lewis board certified?
Yes. Dr. Lewis is board certified in ophthalmology by the American Board of Ophthalmology.
Show 8 more questionsShow fewer questions
What services does Dr. Gregory Michael Lewis bill to Medicare?
In 2024, Dr. Lewis' most billed Medicare services were surgery: eye (67028).
Where did Dr. Gregory Michael Lewis go to medical school?
Dr. Lewis graduated from University of Tennessee Health Science Center College of Medicine - Memphis in 2001.
What drugs does Dr. Gregory Michael Lewis prescribe most?
In 2024 Medicare Part D data, Dr. Lewis' most prescribed drugs by claims were Prednisolone Acetate, Latanoprost and Dorzolamide-Timolol.
Has Dr. Gregory Michael Lewis received payments from drug or device companies?
CMS Open Payments shows $468 in general payments to Dr. Lewis from 10 companies from 2016 to 2025. The largest total came from Regeneron Pharmaceuticals, Inc.
How long has Dr. Gregory Michael Lewis been practicing?
Dr. Lewis graduated from medical school in 2001, 25 years ago.
Does Dr. Gregory Michael Lewis do research?
Dmand AI links 1 publication to Dr. Lewis.
Who does Dr. Gregory Michael Lewis publish with?
Dr. Lewis' most frequent co-authors are Paul L. Kaufman, MD (1 shared paper).
What insurance does Dr. Gregory Michael Lewis accept?
Dr. Lewis is in network with 5 carriers, including Excellus BlueCross BlueShield, Cigna and Kaiser Permanente. HMO plans come from the most carriers, 3. Check the plan with the practice before a visit.
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