Michael Joseph Welch, M.D.
Allergy & Immunology Physician · San Diego, CA
Michael Joseph Welch, M.D. is an allergy & immunology physician with a practice address in San Diego, California, and NPI 1699794222, issued on Jul 18, 2006. Check the license (California G34844, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Joseph Welch
- Credential
- M.D.
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- G34844 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5776 Ruffin RD, San Diego, CA 92123
- Phone
- (858) 292-1144
- Enumerated
- Jul 18, 2006
- Record last updated
- Mar 14, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (858) 268-5145
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Also registered at 5776 Ruffin RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Martin Caha, MDAllergy & Immunology Physician1720548209
- Ethan Canty, MDAllergy & Immunology Physician1790312536
- Bob Geng, M.D.Allergy & Immunology Physician1356570758
- Barbara Goergen, N.P.Nurse Practitioner1720150857
- Jill Greer, MS, RD, CNSCPediatric Nutrition Registered Dietitian1891047940
- Alexander Greiner, M.D.Allergy & Immunology Physician1609801299
Verify Michael Joseph Welch in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G34844Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
22 Medicare Part D claims, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 55% of 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.
Michael Joseph Welch among 444 allergy & immunology physician records in California
Michael Joseph Welch, M.D. is one of 444 allergy & immunology 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 7% of them.
- NPI issued2006 · 7% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2016 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in California
There are 444 allergy & immunology physician records in California.
All 444 in California → Every provider in San Diego → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Seema Aceves, M.D., PH.D.San Diego, CA 921231366511628
- Mercedes Amado, M.D.San Diego, CA 921231477510287
- John Bastian, M.D.San Diego, CA 921231316018179
- Lori Broderick, M.D., PH.D.San Diego, CA 921231417152232
- William Ebbeling, M.D.San Diego, CA 921231205808284
- Alexander Greiner, M.D.San Diego, CA 921231609801299
- Harold Hoffman, M.D.San Diego, CA 921231326074261
- Anthony Horner, M.D.San Diego, CA 921231700957560
Common questions
What is Michael Joseph Welch, M.D.'s NPI number?
Michael Joseph Welch, M.D.'s National Provider Identifier (NPI) is 1699794222, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael Joseph Welch, M.D. located?
The NPPES record lists a practice address at 5776 Ruffin RD, San Diego, CA, 92123. Phone: (858) 292-1144. Providers update this record themselves, so call before visiting.
How can I verify Michael Joseph Welch, M.D.'s license?
NPPES lists California license number G34844, 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 Michael Joseph Welch, M.D. prescribe under Medicare Part D?
In 2024, Michael Joseph Welch, M.D. had 22 Medicare Part D claims; the average among allergy & immunology physician prescribers was 741. 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.