Mark E. Mass, MD
Emergency Medical Services (Emergency Medicine) Physician · Lake Forest, IL
Mark E. Mass, MD is an emergency medical services (emergency medicine) physician with a practice address in Lake Forest, Illinois, and NPI 1841276847, issued on Dec 21, 2005. Check the license (Illinois 036-093222, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mark E. Mass
- Credential
- MD
- Primary taxonomy
- Emergency Medical Services (Emergency Medicine) Physician 207PE0004X
- License numbers
- 036-093222 IL
36093222 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1025 W Everett RD, Lake Forest, IL 60045
- Phone
- (847) 234-7950
- Enumerated
- Dec 21, 2005
- Record last updated
- Apr 23, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (847) 234-7940
- Medicaid ID
- 36093222 IL
- Medicare enrollment
- Enrolled (PECOS I20110114001063); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1988
- Entity
- Type 1 · individual
8 nearest emergency medical services (emergency medicine) physician records → All 117 in Illinois → Look up another NPI →
Also registered at 1025 W Everett RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Linda Yellin, D.C.Chiropractor1699877332
Verify Mark E. Mass 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 036-093222Check 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% fewer Medicare Part D claims than the average emergency medical services (emergency medicine) physician in 2024
126 Medicare Part D claims for 94 beneficiaries, against an average of 292 among the 1,653 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Albuterol Sulfate Hfa14 claims
- Clarithromycin11 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): 94.1 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
- Mass Medical SCLake Forest, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark E. Mass among 117 emergency medical services (emergency medicine) physician records in Illinois
Mark E. Mass, MD is one of 117 emergency medical services (emergency medicine) physician records with a practice address in Illinois. 53% 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, 76% newer
- In a Medicare fileYes · 53% of these records are
- In the CMS Doctors and Clinicians fileYes · 37% of these records are
- Graduated1988 · median 1996 among the 42 with a school on file
- Record last updated2014 · 75% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PE0004X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medical Services (Emergency Medicine) Physician providers in Illinois
There are 117 emergency medical services (emergency medicine) physician records in Illinois.
All 117 in Illinois → Every provider in Lake Forest → Emergency Medical Services (Emergency Medicine) Physician nationwide →
The 8 emergency medical services (emergency medicine) physician records with the nearest ZIP codes
- Trevor Hamilton, MDLake Forest, IL 600451609855634
- Lacy Knight, MDLake Forest, IL 600451487630448
- Anne Nagle, MDLake Forest, IL 600451801875851
- Michael Peters, MDLake Forest, IL 600451871572610
- Bonnie Salomon, MDLake Forest, IL 600451215916259
- Angela Shropshire, MDLake Forest, IL 600451942286059
- Calvin Terrell, MDLibertyville, IL 600481558347377
- Susan Kanehann, MDMcHeny, IL 600501588678015
Common questions
What is Mark E. Mass, MD's NPI number?
Mark E. Mass, MD's National Provider Identifier (NPI) is 1841276847, issued on Dec 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark E. Mass, MD located?
The NPPES record lists a practice address at 1025 W Everett RD, Lake Forest, IL, 60045. Phone: (847) 234-7950. Providers update this record themselves, so call before visiting.
How can I verify Mark E. Mass, MD's license?
NPPES lists Illinois license number 036-093222, 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 Mark E. Mass, MD prescribe under Medicare Part D?
In 2024, Mark E. Mass, MD had 126 Medicare Part D claims for 94 beneficiaries; the average among emergency medical services (emergency medicine) physician prescribers was 292. Part D covers Medicare prescriptions only.
What is Mark E. Mass, MD's MIPS final score?
The 2023 MIPS final score is 94.1 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.