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Dr. Nikolas W. Greenson, MD
NPI1811997737PAC ID8224933650
- Medicare services, 2024
- 663
- Medicare patients, 2024
- 608
- Part D claims, 2024
- 354
- Publications
- 2
- MIPS score, 2024
- 95
- Practice address
- 450 East Romie Lane, Salinas, CA 93901
- Practice phone
- Call (831) 757-4333
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Greenson's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Nikolas W. Greenson is an emergency medicine physician in Salinas, California
Dr. Greenson practices at Salinas Valley Health Medical Center in Salinas, California, part of Salinas Valley Memorial Healthcare System.
Dr. Greenson's NPI, 1811997737, was assigned on July 21, 2005. Dr. Greenson graduated from UC San Diego School of Medicine in 2001. Dr. Greenson holds California license A79764.
NPI and contact details
- NPI
- 1811997737NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8224933650
- NPI enumeration date
- July 21, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (831) 757-4333
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nikolas W. Greenson practices at Salinas Valley Health Medical Center in Salinas, California
Dr. Greenson's primary practice is Salinas Valley Health Medical Center, at 450 East Romie Lane, Salinas, CA 93901 in Monterey County. The practice phone is (831) 757-4333.
- Salinas Valley Health Medical Center450 East Romie Lane, Salinas, CA 93901 · Monterey CountyPhone(831) 757-4333
Source: Dmand AI Affiliation Data
Dr. Nikolas W. Greenson is affiliated with 1 site of care and 2 medical groups
Dr. Greenson's primary practice is Salinas Valley Health Medical Center in Salinas, California, part of Salinas Valley Memorial Healthcare System. The medical group on file is Vituity. Dmand AI also links Dr. Greenson to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nikolas W. Greenson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Greenson practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Salinas Valley Health Medical Center | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every hospital where Dr. Greenson practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across Salinas Valley Memorial Healthcare System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Nikolas W. Greenson is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Greenson's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Greenson is board certified in emergency medicine by the American Board of Emergency Medicine. Dmand AI has Dr. Greenson's licenses on file in 2 states: California and Arizona.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- Arizona license
Emergency medicine physicians near Dr. Greenson
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
7,423emergency medicine physicians in California44emergency medicine physicians in Salinas19emergency medicine physicians at Salinas Valley Health Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Nikolas W. Greenson billed Medicare for 663 services in 2024
CMS data shows 663 Medicare services from Dr. Greenson across 4 procedure codes in 2024, for 608 Medicare patients. Medicare paid $82,566 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2024663
Medicare patients608
Paid by Medicare$82,566
Procedure codes4
Dr. Greenson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 8042024: 66318%
Dr. Greenson compared with the California median for emergency medicine physicians, 2024
- Dr. Greenson
- California median
- Medicare services
- 663vs 2652.5 times
- Medicare patients
- 608vs 2432.5 times
- Part D claims
- 251vs 624.0 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Greenson's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Greenson?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Greenson and other emergency medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nikolas W. Greenson treated 608 Medicare patients in 2024, average age 74
CMS counts 608 Medicare patients who saw Dr. Greenson in 2024. The largest group is 65 to 74, with 227 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 57% are also on Medicaid. Their average risk score is 2.15, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Greenson's median patient age at 36, with 58% women.
Medicare patients, 2024608
Average age74
Average risk score2.15
Also on Medicaid57%
Dr. Greenson's Medicare patients by age, 2024
Dr. Greenson's Medicare patients by sex, 2024
- Women36360%
- Men24540%
Chronic conditions among Dr. Greenson's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes53%
- Arthritis48%
- Chronic kidney disease35%
- Mood disorders35%
- Anxiety34%
- Heart failure34%
Share of Medicare patients with each condition. A patient can have several.
Dr. Greenson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 36
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nikolas W. Greenson wrote 354 Medicare Part D claims in 2024
In 2024, Dr. Greenson wrote 354 Medicare Part D claims for 221 patients. 91% of them were for generic drugs. CMS names the drug for 251 of them, across 9 drugs with 11 or more claims each, at $1,823 in total drug cost. In 2023, CMS named 301 claims across 8 drugs.
Part D claims, 2024354
Drugs named by CMS9
Total drug cost$1,823
Part D patients221
Dr. Greenson's Part D claims by kind of drug, 2024
- Generic323 claims91%
- Brand-name31 claims9%
Dr. Greenson's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Greenson's Part D claims, 2024
- Opioids11%40 of 354 claims
- Antibiotics24%84 of 354 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3012024: 25117%
Drugs named by CMS: 9 in 2024, 8 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Nikolas W. Greenson scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. Greenson for performance year 2024, reported as part of a group. Dr. Greenson accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Greenson's MIPS scores, performance year 2024
- 95of 100Final score
- 77.4of 100Quality
- 40of 100Improvement Activities
- 98of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Nikolas W. Greenson has 2 publications on record
Dmand AI links 2 papers to Dr. Greenson. Dr. Greenson's most frequent co-authors are Alan Maisel, MD and Margaret T. Marshall, MD.
Papers2
Dr. Greenson's most frequent co-authors
Recent publications by Dr. Greenson
AppendicitisLipomaRetroperitoneal Neoplasms
See who Dr. Greenson researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Greenson works with, so you can find a warm path to the right emergency medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Nikolas W. Greenson graduated from UC San Diego School of Medicine
Dr. Greenson graduated from UC San Diego School of Medicine in 2001.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Nikolas W. Greenson accepts plans from 6 insurance carriers
Dr. Greenson is in network with 6 carriers, including United Healthcare, Aspirus Health Plan and Blue Cross and Blue Shield of Kansas City. PPO plans come from the most carriers, 3. Check the plan with the practice before a visit.
- United Healthcare
- Aspirus Health Plan
- Blue Cross and Blue Shield of Kansas City
- CMS Medicare
- Elevance
- HCSC
Plan types Dr. Greenson accepts, by number of carriers
- PPO3
- Medicare2
- POS2
- EPO1
- HMO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Nikolas W. Greenson's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Nikolas W. Greenson
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Nikolas W. Greenson's NPI number?
Dr. Nikolas W. Greenson's NPI number is 1811997737. It was assigned on July 21, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Nikolas W. Greenson?
Dr. Nikolas W. Greenson is an emergency medicine physician in Salinas, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Nikolas W. Greenson practice?
Dr. Greenson practices at 450 East Romie Lane, Salinas, CA 93901. Dr. Greenson's primary practice is Salinas Valley Health Medical Center in Salinas, California, part of Salinas Valley Memorial Healthcare System. Dmand AI also links Dr. Greenson to 1 medical group.
What is Dr. Nikolas W. Greenson's office phone number?
The practice phone on file for Dr. Greenson is (831) 757-4333.
What is Dr. Nikolas W. Greenson's medical license number?
Dr. Greenson holds California license A79764, one of the licenses on file in 2 states.
Which states has Dr. Nikolas W. Greenson been licensed in?
Dmand AI has state licenses on file for Dr. Greenson in California (2002 to 2026) and Arizona (since 2004).
Which hospitals is Dr. Nikolas W. Greenson affiliated with?
Dr. Greenson practices at Salinas Valley Health Medical Center in Salinas, California.
What medical group is Dr. Nikolas W. Greenson part of?
Dr. Greenson is linked to Vituity. Dmand AI links Dr. Greenson to 1 more medical group.
Does Dr. Nikolas W. Greenson accept Medicare?
Yes. CMS data shows Dr. Greenson billed Medicare for 663 services in 2024, and Dr. Greenson accepts Medicare assignment.
What is Dr. Nikolas W. Greenson's MIPS score?
Dr. Greenson's MIPS final score for performance year 2024 is 95 out of 100, reported as part of a group.
Show 9 more questionsShow fewer questions
How many Medicare patients does Dr. Nikolas W. Greenson see?
CMS counts 608 Medicare patients who saw Dr. Greenson in 2024, with an average age of 74.
Is Dr. Nikolas W. Greenson board certified?
Yes. Dr. Greenson is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Nikolas W. Greenson bill to Medicare?
In 2024, Dr. Greenson's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and critical care (99291).
Where did Dr. Nikolas W. Greenson go to medical school?
Dr. Greenson graduated from UC San Diego School of Medicine in 2001.
What drugs does Dr. Nikolas W. Greenson prescribe most?
In 2024 Medicare Part D data, Dr. Greenson's most prescribed drugs by claims were Ondansetron ODT, Cephalexin and Hydrocodone-Acetaminophen.
How long has Dr. Nikolas W. Greenson been practicing?
Dr. Greenson graduated from medical school in 2001, 25 years ago.
Does Dr. Nikolas W. Greenson do research?
Dmand AI links 2 publications to Dr. Greenson.
Who does Dr. Nikolas W. Greenson publish with?
Dr. Greenson's most frequent co-authors are Alan Maisel, MD (1 shared paper) and Margaret T. Marshall, MD (1 shared paper).
What insurance does Dr. Nikolas W. Greenson accept?
Dr. Greenson is in network with 6 carriers, including United Healthcare, Aspirus Health Plan and Blue Cross and Blue Shield of Kansas City. PPO plans come from the most carriers, 3. Check the plan with the practice before a visit.
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