Larry Steven Posner, MD
Allergy & Immunology Physician · Napa, CA
Larry Steven Posner, MD is an allergy & immunology physician with a practice address in Napa, California, and NPI 1548271216, issued on Aug 10, 2006. Check the license (California G52218, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Larry Steven Posner
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- G52218 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1100 Pear Tree Lane, Napa, CA 94558
- Phone
- (707) 258-8100
- Enumerated
- Aug 10, 2006
- Record last updated
- Feb 27, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (707) 258-0734
- Medicaid ID
- 00G522180 CA
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Verify Larry Steven Posner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G52218Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
11 Medicare Part D claims, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D.
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.
Larry Steven Posner among 444 allergy & immunology physician records in California
Larry Steven Posner, MD 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 updated2020 · 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 Napa → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Kathleen Tajiri, MDNapa, CA 945581689624983
- Frank Orson, M.D.Lafayette, CA 945491982626131
- Madeleine Chollet, M.D., PH.D.Dublin, CA 945681518351667
- Raymond Hong, M.D.Dublin, CA 945681881890200
- Natalie CacHayward, CA 945451205006657
- Michael Louie, MDHayward, CA 945451629156492
- Robert Sachs, MDHayward, CA 945451083792857
- Paul Cheng, MDSan Leandro, CA 945771073619706
Common questions
What is Larry Steven Posner, MD's NPI number?
Larry Steven Posner, MD's National Provider Identifier (NPI) is 1548271216, issued on Aug 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Larry Steven Posner, MD located?
The NPPES record lists a practice address at 1100 Pear Tree Lane, Napa, CA, 94558. Phone: (707) 258-8100. Providers update this record themselves, so call before visiting.
How can I verify Larry Steven Posner, MD's license?
NPPES lists California license number G52218, 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 Larry Steven Posner, MD prescribe under Medicare Part D?
In 2024, Larry Steven Posner, MD had 11 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.