John Lambert Flach, DO
Neurology Physician · Arlington Heights, IL
John Lambert Flach, DO is a neurology physician with a practice address in Arlington Heights, Illinois, and NPI 1386223089, issued on Apr 8, 2021. Check the license (Illinois 036173195, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John Lambert Flach
- Credential
- DO
- Primary taxonomy
- Neurology Physician 2084N0400X
- License number
- 036173195 IL
Self-reported in NPPES; status is on the state search - Practice location
- 880 W Central RD, Arlington Heights, IL 60005
- Phone
- (847) 618-4430
- Enumerated
- Apr 8, 2021
- Record last updated
- Sep 24, 2025
- Fax
- (847) 618-0786
- Medicare enrollment
- Enrolled (PECOS I20250702001992); accepts Medicare assignment
- Medical or professional school
- Lincoln Mem Univ, Debusk Col Of Osteopathic Med, 2021
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest neurology physician records → All 952 in Illinois → Look up another NPI →
Also registered at 880 W Central RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Maggie Curran, APN-CNPNurse Practitioner1699503953
Verify John Lambert Flach 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 036173195Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average neurology physician in 2024
183 Medicare Part D claims for 30 beneficiaries, against an average of 1,370 among the 15,005 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Levetiracetam32 claims
- Topiramate19 claims
- Carbidopa-Levodopa17 claims
- Gabapentin14 claims
- Nurtec Odt11 claims
- Primidone11 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
- Endeavor Health Medical GroupEvanston, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Lambert Flach among 952 neurology physician records in Illinois
John Lambert Flach, DO is one of 952 neurology physician records with a practice address in Illinois. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 81% of them.
- NPI issued2021 · 81% of these records are older, 15% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2021 · median 2006 among the 573 with a school on file
- Record last updated2025 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084N0400X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurology Physician providers in Illinois
There are 952 neurology physician records in Illinois.
All 952 in Illinois → Every provider in Arlington Heights → Neurology Physician nationwide →
The 8 neurology physician records with the nearest ZIP codes
- Abdullah Alsawaf, M.D.Arlington Heights, IL 600051023376951
- Mohammad Anadani, MDArlington Heights, IL 600051407237977
- Rosalyn AranasArlington Heights, IL 600051568629822
- Kelly Blair, MDArlington Heights, IL 600051538784079
- Sheheryar Jamali, MDArlington Heights, IL 600051649703281
- Brooke Johnson, D.O.Arlington Heights, IL 600051023457512
- Asadullah Khan, M.D.Arlington Heights, IL 600051003836107
- Sailaja Maramreddy, MDArlington Heights, IL 600051053307132
Common questions
What is John Lambert Flach, DO's NPI number?
John Lambert Flach, DO's National Provider Identifier (NPI) is 1386223089, issued on Apr 8, 2021. An NPI identifies a provider in billing; it is not a license.
Where is John Lambert Flach, DO located?
The NPPES record lists a practice address at 880 W Central RD, Arlington Heights, IL, 60005. Phone: (847) 618-4430. Providers update this record themselves, so call before visiting.
How can I verify John Lambert Flach, DO's license?
NPPES lists Illinois license number 036173195, 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 John Lambert Flach, DO prescribe under Medicare Part D?
In 2024, John Lambert Flach, DO had 183 Medicare Part D claims for 30 beneficiaries; the average among neurology physician prescribers was 1,370. 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.