Nathan L. Lewis, MD
Internal Medicine Physician · Pasadena, CA
Nathan L. Lewis, MD is an internal medicine physician with a practice address in Pasadena, California, and NPI 1912923004, issued on Jul 14, 2006. Check the license (California G40994, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nathan L. Lewis
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G40994 CA
Self-reported in NPPES; status is on the state search - Practice location
- 675 S Arroyo Pkwy Ste 310, Pasadena, CA 91105
- Phone
- (626) 796-8181
- Enumerated
- Jul 14, 2006
- Record last updated
- Oct 23, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (626) 796-1874
- Medicare enrollment
- Enrolled (PECOS I20101203000350); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1978
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Nathan L. Lewis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G40994Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% more Medicare Part D claims than the average internal medicine physician in 2024
5,629 Medicare Part D claims for 336 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 108 claims were for opioids.
Most prescribed
- Atorvastatin Calcium416 claims
- Amlodipine Besylate276 claims
- Furosemide189 claims
- Metformin Hcl164 claims
- Carvedilol151 claims
- Levothyroxine Sodium149 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Nathan L. Lewis among 17,696 internal medicine physician records in California
Nathan L. Lewis, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1978 · median 2004 among the 11,065 with a school on file
- Record last updated2018 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
137 internal medicine physician records list a practice address in Pasadena
They are 137 of the 10,525 NPPES records with a practice address in Pasadena, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Pasadena → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Dolores Barba, MDPasadena, CA 911051992700603
- Barry Blum, MDPasadena, CA 911051639141716
- Betsy Felser, MDPasadena, CA 911051144292897
- Todd Hee, M.D.Pasadena, CA 911051689648693
- Wei Huang-Lee, MDPasadena, CA 911051972576841
- George Jung, MDPasadena, CA 911051720051881
- Kristin Karlyn, MDPasadena, CA 911051033182530
- Malathi Narayan, MDPasadena, CA 911051588637466
Common questions
What is Nathan L. Lewis, MD's NPI number?
Nathan L. Lewis, MD's National Provider Identifier (NPI) is 1912923004, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Nathan L. Lewis, MD located?
The NPPES record lists a practice address at 675 S Arroyo Pkwy Ste 310, Pasadena, CA, 91105. Phone: (626) 796-8181. Providers update this record themselves, so call before visiting.
How can I verify Nathan L. Lewis, MD's license?
NPPES lists California license number G40994, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathan L. Lewis, MD prescribe under Medicare Part D?
In 2024, Nathan L. Lewis, MD had 5,629 Medicare Part D claims for 336 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.