Maria Holstrom-Mercader
Emergency Medicine Physician · Libertyville, IL
Maria Holstrom-Mercader is an emergency medicine physician with a practice address in Libertyville, Illinois, and NPI 1306536339, issued on May 12, 2023. Check the license (Illinois 036.178321, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Maria Holstrom-Mercader
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 036.178321 IL
Self-reported in NPPES; status is on the state search - Practice location
- 801 S Milwaukee Ave, Libertyville, IL 60048
- Phone
- (847) 362-2900
- Enumerated
- May 12, 2023
- Record last updated
- Jun 18, 2026
- Medicare enrollment
- Enrolled (PECOS I20260122000740); may accept Medicare assignment
- Medical or professional school
- Pennsylvania State University College Of Medicine, 2023
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 3,291 in Illinois → Look up another NPI →
Also registered at 801 S Milwaukee Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Maria Holstrom-Mercader in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036.178321Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average emergency medicine physician in 2024
39 Medicare Part D claims for 26 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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.
Maria Holstrom-Mercader among 3,291 emergency medicine physician records in Illinois
Maria Holstrom-Mercader is one of 3,291 emergency medicine physician records with a practice address in Illinois. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 89% of them.
- NPI issued2023 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2023 · median 2012 among the 1,867 with a school on file
- Record last updated2026 · 47% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 emergency medicine physician records list a practice address in Libertyville
They are 15 of the 1,361 NPPES records with a practice address in Libertyville, and 3,291 emergency medicine physician records in Illinois.
All 3,291 in Illinois → Every provider in Libertyville → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Christopher Beach, M.D.Libertyville, IL 600481649245564
- J Eric Castro, MDLibertyville, IL 600481316971807
- Andrew Geiser, MDLibertyville, IL 600481891343133
- Joshua Hallett, D.O.Libertyville, IL 600481336452861
- Roy Horras, M.D., FACEPLibertyville, IL 600481255356663
- Shahab Kazi, DOLibertyville, IL 600481194306894
- Peter Kurko, M.D.Libertyville, IL 600481225065782
- Rachel McDowell, MDLibertyville, IL 600481104879071
Common questions
What is Maria Holstrom-Mercader's NPI number?
Maria Holstrom-Mercader's National Provider Identifier (NPI) is 1306536339, issued on May 12, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Maria Holstrom-Mercader located?
The NPPES record lists a practice address at 801 S Milwaukee Ave, Libertyville, IL, 60048. Phone: (847) 362-2900. Providers update this record themselves, so call before visiting.
How can I verify Maria Holstrom-Mercader's license?
NPPES lists Illinois license number 036.178321, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Maria Holstrom-Mercader prescribe under Medicare Part D?
In 2024, Maria Holstrom-Mercader had 39 Medicare Part D claims for 26 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.