Larry Marianella, M.D.
Internal Medicine Physician · Santa Rosa, CA
Larry Marianella, M.D. is an internal medicine physician with a practice address in Santa Rosa, California, and NPI 1144257486, issued on Jun 26, 2006. Check the license (California G038835, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Larry Marianella
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G038835 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1515 Montgomery Dr, Santa Rosa, CA 95405
- Phone
- (707) 526-4865
- Enumerated
- Jun 26, 2006
- Record last updated
- Feb 22, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (707) 526-5375
- Medicaid ID
- 00G388351 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1515 Montgomery Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Larry Marianella in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G038835Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% more Medicare Part D claims than the average internal medicine physician in 2024
4,353 Medicare Part D claims for 257 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 14 claims were for opioids.
Most prescribed
- Atorvastatin Calcium236 claims
- Omeprazole140 claims
- Gabapentin138 claims
- Levothyroxine Sodium131 claims
- Amlodipine Besylate120 claims
- Benazepril Hcl120 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): 28.1 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).
Larry Marianella among 17,696 internal medicine physician records in California
Larry Marianella, M.D. 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 fileNo · 63% of these records are
- Record last updated2010 · 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).
98 internal medicine physician records list a practice address in Santa Rosa
They are 98 of the 6,884 NPPES records with a practice address in Santa Rosa, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Santa Rosa → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- David Capaccio, DOSanta Rosa, CA 954051457355364
- David Charp, M.D.Santa Rosa, CA 954051053335208
- Catherine Davis, MDSanta Rosa, CA 954051497748776
- Marlon Decastro, M.D.Santa Rosa, CA 954051780643270
- John Hurwitz, DOSanta Rosa, CA 954051124018262
- Adina Logan, M.D.Santa Rosa, CA 954051881667178
Common questions
What is Larry Marianella, M.D.'s NPI number?
Larry Marianella, M.D.'s National Provider Identifier (NPI) is 1144257486, issued on Jun 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Larry Marianella, M.D. located?
The NPPES record lists a practice address at 1515 Montgomery Dr, Santa Rosa, CA, 95405. Phone: (707) 526-4865. Providers update this record themselves, so call before visiting.
How can I verify Larry Marianella, M.D.'s license?
NPPES lists California license number G038835, 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 Marianella, M.D. prescribe under Medicare Part D?
In 2024, Larry Marianella, M.D. had 4,353 Medicare Part D claims for 257 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Larry Marianella, M.D.'s MIPS final score?
The 2023 MIPS final score is 28.1 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.