DR. MERVIN NIGEL LEADER (M.D.) – Psychiatry Physician, NPI 1255522611
Psychiatry Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
Provider Addresses for DR. MERVIN NIGEL LEADER (M.D.)
PO BOX 23070
BARLING, AR 729230070
Phone: (479) 452-5040
Fax: (479) 452-5047
Type: Mailing
303 NW 11TH ST
FAIRFIELD, IL 628371203
Phone: (618) 842-4617
Fax: (618) 847-8387
Type: Mailing
844 COUNTY ROAD 2150 E
FAIRFIELD, IL 628372823
Phone: (479) 259-8855
Fax: (870) 364-9774
Type: Location
South Waldron Road, Fort Smith, Sebastian County, Arkansas, 72903, United States
FORT SMITH, AR 729032556
Phone: (479) 452-5040
Fax: (479) 452-5047
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $19.
Total Amount is formed as General ($19) + Research ($0) + Ownership ($0) = $19.
Last reported payment date: 2023-10-26 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($19).
Total Amount
$19
General + Research + Ownership
Payments
1
Total payment records
General Amount
$19
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-10-26
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AstraZeneca Pharmaceuticals LP | $19 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2018-08-06
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20071026000338 | I | Psychiatry | AR | TBD |
| I20180806000793 | I | Psychiatry | IN | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 72923)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| Clinical Social Worker | AR | |
| Mental Health Counselor | AR |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.