Nikolas W. Greenson, M.D.
Emergency Medicine Physician · Salinas, CA
Nikolas W. Greenson, M.D. is an emergency medicine physician with a practice address in Salinas, California, and NPI 1811997737, issued on Jul 21, 2005. Check the license (California A79764, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nikolas W. Greenson
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A79764 CA
Self-reported in NPPES; status is on the state search - Practice location
- 450 E Romie LN, Salinas, CA 93901
- Phone
- (831) 759-1840
- Enumerated
- Jul 21, 2005
- Record last updated
- Feb 23, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicaid ID
- 851586 AZ
- Medicare enrollment
- Enrolled (PECOS I20031126000726); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2001
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 450 E Romie LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Surinder Bahia, M.D.Hospitalist Physician1467716530
- Richard Berkowitz, M.D.Diagnostic Radiology Physician1962593681
- Glen Berry, MDAnesthesiology Physician1407870322
Verify Nikolas W. Greenson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A79764Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% more Medicare Part D claims than the average emergency medicine physician in 2024
354 Medicare Part D claims for 221 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 40 claims were for opioids.
Most prescribed
- Ondansetron Odt67 claims
- Cephalexin44 claims
- Hydrocodone-Acetaminophen38 claims
- Albuterol Sulfate Hfa22 claims
- Famotidine22 claims
- Ibuprofen21 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): 86.1 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).
Bills Medicare through one group practice
- Salinas Valley Emergency Medical Group, IncSalinas, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nikolas W. Greenson among 7,751 emergency medicine physician records in California
Nikolas W. Greenson, M.D. is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 96% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2001 · median 2011 among the 4,560 with a school on file
- Record last updated2011 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Salinas → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Nanette Blair, MDSalinas, CA 939011710980289
- Eric Fajardo, MDSalinas, CA 939011265435739
- Ronald Gertsch, M.D.Salinas, CA 939011043356033
- Erica Locke, M.DSalinas, CA 939011043530694
- Paul Marchand, M.D.Salinas, CA 939011952344186
- Theresa Marsh, MDSalinas, CA 939011437459138
- Robert Morris, M.D.Salinas, CA 939011841510468
- Misty Navarro, M.D.Salinas, CA 939011841290434
Common questions
What is Nikolas W. Greenson, M.D.'s NPI number?
Nikolas W. Greenson, M.D.'s National Provider Identifier (NPI) is 1811997737, issued on Jul 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Nikolas W. Greenson, M.D. located?
The NPPES record lists a practice address at 450 E Romie LN, Salinas, CA, 93901. Phone: (831) 759-1840. Providers update this record themselves, so call before visiting.
How can I verify Nikolas W. Greenson, M.D.'s license?
NPPES lists California license number A79764, 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 Nikolas W. Greenson, M.D. prescribe under Medicare Part D?
In 2024, Nikolas W. Greenson, M.D. had 354 Medicare Part D claims for 221 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Nikolas W. Greenson, M.D.'s MIPS final score?
The 2023 MIPS final score is 86.1 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.