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DR. MERVIN NIGEL LEADER M.D.
NPI 1255522611
Psychiatry & Neurology - Psychiatry in Fairfield, IL

Active since August 09, 2007PECOS Enrolled
844 COUNTY ROAD 2150 E, FAIRFIELD, IL 62837(479) 259-8855(870) 364-9774 Get Directions Write a Review

NPPES record last updated: February 10, 2025. Verified against the NPPES registry weekly; last sync: August 23, 2026.

Record update history: Feb 10, 2025, Mar 28, 2023, Jan 13, 2020 and 1 more (4 updates tracked since 2016).

About Dr. Mervin Nigel Leader M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MERVIN NIGEL LEADER M.D. (NPI 1255522611) is an individual psychiatry provider in Fairfield, Illinois, licensed in Illinois (036163562) and active in the NPI registry since August 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1255522611
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameDR. MERVIN NIGEL LEADERCredential: M.D.
Location Address844 COUNTY ROAD 2150 EFairfield, IL 62837-2823
Mailing Address303 Nw 11th StFairfield, IL 62837-1203 · (618) 842-4617 · Fax (618) 847-8387
Phone(479) 259-8855
Fax(870) 364-9774
Sole ProprietorNo
Enumeration DateAugust 9, 2007
Last NPPES UpdateFebruary 10, 20254 updates tracked since enumeration
NPPES CertifiedFebruary 10, 2025
✔ NPI 1255522611 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
Licenses✔ Licensed in IL · 036163562✔ Licensed in AR · E-5515
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
844 COUNTY ROAD 2150 E, Fairfield, IL 62837
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mervin Nigel Leader M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer– Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 62837 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$168.44 typical visit price
range $54.80 – $168.44
Typical copayment $42.11 (range $13.70 – $42.11)
Most-billed visit code 99205
Established Patient
$68.64 typical visit price
range $17.16 – $136.56
Typical copayment $17.16 (range $4.29 – $34.14)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mervin Leader's NPI number?

The NPI number for Mervin Leader is 1255522611. It was assigned to this individual provider in the NPPES registry on August 9, 2007.

Where is Mervin Leader located?

Mervin Leader practices at 844 County Road 2150 E, Fairfield, IL 62837. The listed phone number is (479) 259-8855.

What is Mervin Leader's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Mervin Leader enrolled in Medicare?

Yes. Mervin Leader is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Mervin Leader was last updated on February 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.