Michael Joseph Harrington, MD
Internal Medicine Physician · Napa, CA
Michael Joseph Harrington, MD is an internal medicine physician with a practice address in Napa, California, and NPI 1124186945, issued on Dec 5, 2006. Check the license (California G17618, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Joseph Harrington
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G17618 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3443 Villa LN Ste 9, Napa, CA 94558
- Phone
- (707) 253-8901
- Enumerated
- Dec 5, 2006
- Record last updated
- Dec 10, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (707) 253-1558
- Medicare enrollment
- Enrolled (PECOS I20100322000157); accepts Medicare assignment
- Medical or professional school
- University Of Colorado School Of Medicine, Denver, 1968
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 3443 Villa LN Ste 9
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Aurelio Campos, MDFamily Medicine Physician1265446280
Verify Michael Joseph Harrington in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G17618Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
228 Medicare Part D claims for 26 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 49% of claims.
Most prescribed
- Enbrel Sureclick60 claims
- Prednisone31 claims
- Hydroxychloroquine Sulfate26 claims
- Rinvoq26 claims
- Humira Pen18 claims
- Methotrexate17 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.
Industry payments in 2024: $400.21
6 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Bills Medicare through one group practice
- Sonoma County Indian Health Project IncSanta Rosa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Joseph Harrington among 17,696 internal medicine physician records in California
Michael Joseph Harrington, 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
- Graduated1968 · median 2004 among the 11,065 with a school on file
- Record last updated2013 · 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).
61 internal medicine physician records list a practice address in Napa
They are 61 of the 3,583 NPPES records with a practice address in Napa, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Napa → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Abhijit Adhye, M.D.Napa, CA 945581992763205
- Scott Anderson, MDNapa, CA 945581619929494
- Patricia Dizmang, M.D.Napa, CA 945581194790261
- Beth Hartung, M.D.Napa, CA 945581275501488
- Ronald Julis, M.D.Napa, CA 945581053311167
- Paul Laband, MDNapa, CA 945581427029040
- Monica McKeever, MDNapa, CA 945581538135298
- Lane Melgarejo, MDNapa, CA 945581588657308
Common questions
What is Michael Joseph Harrington, MD's NPI number?
Michael Joseph Harrington, MD's National Provider Identifier (NPI) is 1124186945, issued on Dec 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael Joseph Harrington, MD located?
The NPPES record lists a practice address at 3443 Villa LN Ste 9, Napa, CA, 94558. Phone: (707) 253-8901. Providers update this record themselves, so call before visiting.
How can I verify Michael Joseph Harrington, MD's license?
NPPES lists California license number G17618, 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 Harrington, MD prescribe under Medicare Part D?
In 2024, Michael Joseph Harrington, MD had 228 Medicare Part D claims for 26 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.