Mervin Nigel Leader, M.D.
Psychiatry Physician · Fairfield, IL
Mervin Nigel Leader, M.D. is a psychiatry physician with a practice address in Fairfield, Illinois, and NPI 1255522611, issued on Aug 9, 2007. Check the license (Illinois 036163562, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mervin Nigel Leader
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License numbers
- 036163562 IL
E-5515 AR
Self-reported in NPPES; status is on the state search - Practice location
- 844 County Road 2150 E, Fairfield, IL 62837
- Phone
- (479) 259-8855
- Enumerated
- Aug 9, 2007
- Record last updated
- Feb 10, 2025
- Fax
- (870) 364-9774
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,147 in Illinois → Look up another NPI →
Verify Mervin Nigel Leader 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 036163562Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average psychiatry physician in 2024
120 Medicare Part D claims for 30 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Fluoxetine Hcl14 claims
- Hydroxyzine Hcl14 claims
- Lithium Carbonate11 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.
Mervin Nigel Leader among 2,147 psychiatry physician records in Illinois
Mervin Nigel Leader, M.D. is one of 2,147 psychiatry physician records with a practice address in Illinois. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 35% of them.
- NPI issued2007 · 35% of these records are older, 50% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileNo · 41% of these records are
- Record last updated2025 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatry Physician providers in Illinois
There are 2,147 psychiatry physician records in Illinois.
All 2,147 in Illinois → Every provider in Fairfield → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Richard Parks, M.D.Du Quoin, IL 628321629057435
- Anand Subramanian, DODu Quoin, IL 628321316467632
- Victoria Codispoti, MDKell, IL 628531710925367
- Reno Ahuja, MDMount Vernon, IL 628641619107968
- Robert Norman, MDCentralia, IL 628011558579755
- Alexander Seger, MDCentralia, IL 628011457913279
- Uaiye Enosolease, MDSpringfield, IL 627811255179081
- Sibtain Kazmi, MDSpringfield, IL 627811649018748
Common questions
What is Mervin Nigel Leader, M.D.'s NPI number?
Mervin Nigel Leader, M.D.'s National Provider Identifier (NPI) is 1255522611, issued on Aug 9, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mervin Nigel Leader, M.D. located?
The NPPES record lists a practice address at 844 County Road 2150 E, Fairfield, IL, 62837. Phone: (479) 259-8855. Providers update this record themselves, so call before visiting.
How can I verify Mervin Nigel Leader, M.D.'s license?
NPPES lists Illinois license number 036163562, 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 Mervin Nigel Leader, M.D. prescribe under Medicare Part D?
In 2024, Mervin Nigel Leader, M.D. had 120 Medicare Part D claims for 30 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.