Elson M. Haas, M.D.
Allergy & Immunology Physician · San Rafael, CA
Elson M. Haas, M.D. is an allergy & immunology physician with a practice address in San Rafael, California, and NPI 1740318112, issued on Feb 28, 2007. Check the license (California G251970, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Elson M. Haas
- Credential
- M.D.
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- G251970 CA
Self-reported in NPPES; status is on the state search - Practice location
- 25 Mitchell Blvd, San Rafael, CA 94903
- Phone
- (415) 472-2343
- Enumerated
- Feb 28, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (415) 472-7636
- Medicare enrollment
- Enrolled (PECOS I20081201000549); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1972
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Also registered at 25 Mitchell Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Seemin Dallenbach, D.C.Chiropractor1215137716
- Lauren Friedeman, DPTPhysical Therapist1801298930
- Ann Hathaway, MDFamily Medicine Physician1093893752
- Judy Lane, N.P., R.N.Adult Health Nurse Practitioner1043420896
- Thomas Reece, DOSports Medicine (Neuromusculoskeletal Medicine) Physician1881722247
- Karilee Shames, PHD, RN, A-HNCPsychiatric/Mental Health Registered Nurse1497959266
Verify Elson M. Haas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G251970Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% more Medicare Part D claims than the average allergy & immunology physician in 2024
1,384 Medicare Part D claims for 228 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 109 claims were for opioids.
Most prescribed
- Levothyroxine Sodium127 claims
- Liothyronine Sodium88 claims
- Amlodipine Besylate83 claims
- Gabapentin67 claims
- Lisinopril53 claims
- Azithromycin43 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.
The MIPS final score for 2023 (Medicare payment program): 25 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $193.67
4 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 2,496 providers of this specialty with any payment received $8,321.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Elson M. Haas among 444 allergy & immunology physician records in California
Elson M. Haas, 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 2007, is newer than 47% of them.
- NPI issued2007 · 47% of these records are older, 38% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1972 · median 2004 among the 281 with a school on file
- Record last updated2007 · 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 Rafael → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Lindsay Finkas, M.D.San Rafael, CA 949031619278322
- Yoon Kwon, M.D.Kentfield, CA 949041861408874
- John Hoehne, MDRichmond, CA 948011942389085
- Michael Lee, DORichmond, CA 948011609370014
- Felicidad Lao-Domingo, MDGilroy, CA 950201518977560
- Bryce Hoffman, M.D.Los Gatos, CA 950301801216742
- Massoud Mahmoudi, D.O.Los Gatos, CA 950321255402640
- Sulochina Lulla, MDSanta Clara, CA 950511821175753
Common questions
What is Elson M. Haas, M.D.'s NPI number?
Elson M. Haas, M.D.'s National Provider Identifier (NPI) is 1740318112, issued on Feb 28, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Elson M. Haas, M.D. located?
The NPPES record lists a practice address at 25 Mitchell Blvd, San Rafael, CA, 94903. Phone: (415) 472-2343. Providers update this record themselves, so call before visiting.
How can I verify Elson M. Haas, M.D.'s license?
NPPES lists California license number G251970, 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 Elson M. Haas, M.D. prescribe under Medicare Part D?
In 2024, Elson M. Haas, M.D. had 1,384 Medicare Part D claims for 228 beneficiaries; the average among allergy & immunology physician prescribers was 741. Part D covers Medicare prescriptions only.
What is Elson M. Haas, M.D.'s MIPS final score?
The 2023 MIPS final score is 25 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.