Neil L. Markus, DO
Emergency Medicine Physician · Vallejo, CA
Neil L. Markus, DO is an emergency medicine physician with a practice address in Vallejo, California, and NPI 1124106950, issued on Nov 1, 2006. Check the license (California 20A8151, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Neil L. Markus
- Credential
- DO
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 20A8151 CA
Self-reported in NPPES; status is on the state search - Practice location
- 975 Sereno Dr, Vallejo, CA 94589
- Phone
- (707) 651-1000
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00AX81510 CA
- Medicare enrollment
- Enrolled (PECOS I20050411001334); accepts Medicare assignment
- Medical or professional school
- College Of Osteo Med Of The Pacific At Pomona, 1998
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 975 Sereno Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joel Aandahl, NPAdult Health Nurse Practitioner1891423653
- Noman Absar, MDCritical Care Medicine (Internal Medicine) Physician1205908951
- Anthony Acquaviva, MDUrology Physician1457439283
- Jhonnard James Acuna, CRNACertified Registered Nurse Anesthetist1205997327
- Omid AfshariPharmacist1184165391
- Eesha AftabStudent in an Organized Health Care Education/Training Program1770421687
Verify Neil L. Markus in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A8151Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% more Medicare Part D claims than the average emergency medicine physician in 2024
243 Medicare Part D claims for 186 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 24 claims were for opioids.
Most prescribed
- Ciprofloxacin Hcl20 claims
- Ondansetron Odt18 claims
- Prednisone16 claims
- Cephalexin15 claims
- Sulfamethoxazole-Trimethoprim15 claims
- Furosemide13 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.
Bills Medicare through one group practice
- Permanente Medical Group IncVallejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Neil L. Markus among 7,751 emergency medicine physician records in California
Neil L. Markus, DO 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 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1998 · median 2011 among the 4,560 with a school on file
- Record last updated2021 · 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).
55 emergency medicine physician records list a practice address in Vallejo
They are 55 of the 2,836 NPPES records with a practice address in Vallejo, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Vallejo → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Ian Ahwah, M.D.Vallejo, CA 945891699795146
- Jason Bateman, MDVallejo, CA 945891285712174
- Peter Chau, MDVallejo, CA 945891114960002
- Ian Chuang, M.D.Vallejo, CA 945891386650521
- Balraj Dhillon, M.D.Vallejo, CA 945891225064454
- Stephanie Eden, MDVallejo, CA 945891609892017
- Danielle Fisher, PA-CVallejo, CA 945891184642464
- Travis Harris, M. D.Vallejo, CA 945891326081696
Common questions
What is Neil L. Markus, DO's NPI number?
Neil L. Markus, DO's National Provider Identifier (NPI) is 1124106950, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Neil L. Markus, DO located?
The NPPES record lists a practice address at 975 Sereno Dr, Vallejo, CA, 94589. Phone: (707) 651-1000. Providers update this record themselves, so call before visiting.
How can I verify Neil L. Markus, DO's license?
NPPES lists California license number 20A8151, 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 Neil L. Markus, DO prescribe under Medicare Part D?
In 2024, Neil L. Markus, DO had 243 Medicare Part D claims for 186 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.