Howard S. Lyon, MD
Internal Medicine Physician · San Diego, CA
Howard S. Lyon, MD is an internal medicine physician with a practice address in San Diego, California, and NPI 1164459764, issued on Jun 27, 2006. Check the license (California G70629, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Howard S. Lyon
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G70629 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4077 Fifth Ave, San Diego, CA 92103
- Phone
- (619) 994-6558
- Enumerated
- Jun 27, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (619) 686-3874
- Medicare enrollment
- Enrolled (PECOS I20110713000111); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 1989
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4077 Fifth Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Howard S. Lyon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G70629Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average internal medicine physician in 2024
335 Medicare Part D claims for 132 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 32 claims were for opioids.
Most prescribed
- Celecoxib30 claims
- Oxycodone Hcl28 claims
- Potassium Chloride14 claims
- Atorvastatin Calcium13 claims
- Prednisone13 claims
- Furosemide12 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.
Bills Medicare through one group practice
- Scripps HealthLa Jolla, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Howard S. Lyon among 17,696 internal medicine physician records in California
Howard S. Lyon, 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
- Graduated1989 · median 2004 among the 11,065 with a school on file
- Record last updated2007 · 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).
961 internal medicine physician records list a practice address in San Diego
They are 961 of the 52,937 NPPES records with a practice address in San Diego, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Diego → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Hamid Amjadi, DOSan Diego, CA 921031700861333
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- Eric Dahms, M.D.San Diego, CA 921031306808464
- Janette Gray, M.D.San Diego, CA 921031295721876
- San Hsieh, MDSan Diego, CA 921031851388847
- Arthur Kingsbury, M.D.San Diego, CA 921031144216284
- Timothy O'Neill, M.D.San Diego, CA 921031831172295
Common questions
What is Howard S. Lyon, MD's NPI number?
Howard S. Lyon, MD's National Provider Identifier (NPI) is 1164459764, issued on Jun 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Howard S. Lyon, MD located?
The NPPES record lists a practice address at 4077 Fifth Ave, San Diego, CA, 92103. Phone: (619) 994-6558. Providers update this record themselves, so call before visiting.
How can I verify Howard S. Lyon, MD's license?
NPPES lists California license number G70629, 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 Howard S. Lyon, MD prescribe under Medicare Part D?
In 2024, Howard S. Lyon, MD had 335 Medicare Part D claims for 132 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.