JAMES W. LOCK MD
NPI 1063499002
Internal Medicine - Hypertension Specialist in Walnut Grove, MS
About James W. Lock Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JAMES W. LOCK MD (NPI 1063499002) is an individual hypertension specialist in Walnut Grove, Mississippi, licensed in Mississippi (12628) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, is affiliated with Forrest General Hospital, and is a graduate of Meharry Medical College School Of Medicine (1989).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 4
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
James W. Lock Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
8Medicare enrollment records show James Lock reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Grove, MS 39189
- Reassigned Medicare billing, Mississippi enrollment
- 16 clinicians in this Medicare group
Prentiss, MS 39474
- Reassigned Medicare billing, Mississippi enrollment
- 58 clinicians in this Medicare group
Prentiss, MS 39474
- Reassigned Medicare billing, Mississippi enrollment
- 58 clinicians in this Medicare group
Hazlehurst, MS 39083
- Reassigned Medicare billing, Mississippi enrollment
- 159 clinicians in this Medicare group
Columbia, MS 39429
- Reassigned Medicare billing, Mississippi enrollment
- 81 clinicians in this Medicare group
Tylertown, MS 39667
- Reassigned Medicare billing, Mississippi enrollment
- 61 clinicians in this Medicare group
Tylertown, MS 39667
- Reassigned Medicare billing, Mississippi enrollment
- 62 clinicians in this Medicare group
Covington, LA 70433
- Reassigned Medicare billing, Mississippi enrollment
- 116 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Forrest General Hospital
Acute Care Hospitals · Hattiesburg, MSS E Lackey Memorial Hospital
Critical Access Hospitals · Forest, MSJefferson Davis Community Hospital Cah
Critical Access Hospitals · Prentiss, MSReferred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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 James Lock's NPI number?
The NPI number for James Lock is 1063499002. It was assigned to this individual provider in the NPPES registry on December 30, 2005.
Where is James Lock located?
James Lock practices at 199 Rimmer Street, Walnut Grove, MS 39189. The listed phone number is (601) 253-2733.
What is James Lock's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hypertension Specialist, with taxonomy code 207RH0005X.
Is James Lock enrolled in Medicare?
Yes. James Lock is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for James Lock's services?
According to the CMS Revalidation Reassignment List (October 2026 release), James Lock reassigns Medicare benefits to 8 organizations: East Central Mississippi Health Care, Inc (Walnut Grove, MS), Rh Emergency Medicine Of Jefferson Davis LLC (Prentiss, MS), Rh Hospitalist Medicine Of Jefferson Davis LLC (Prentiss, MS), Keystone Medical Services Of Ms, Inc (Hazlehurst, MS), Rh Emergency Medicine Of Marion General LLC (Columbia, MS) and 3 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for James Lock's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does James Lock accept?
Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter of Alabama and Ambetter of Tennessee and 4 other insurers list James Lock as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is James Lock affiliated with any hospitals?
According to CMS data, James Lock is affiliated with Forrest General Hospital, S E Lackey Memorial Hospital and Jefferson Davis Community Hospital Cah.
When was this NPI record last updated?
The NPPES record for James Lock was last updated on June 26, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years 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.
# James W. Lock, MD · NPI 1063499002
Hypertension Specialist physician in Walnut Grove, Mississippi. Individual provider, active in the CMS NPPES registry since December 30, 2005.
## Identity
- **NPI:** 1063499002 (Entity type: Individual)
- **Enumerated:** December 30, 2005
- **Primary specialty:** Internal Medicine - Hypertension Specialist · taxonomy 207RH0005X
- **State license:** 12628 (Mississippi)
- **Sole proprietor:** No
## Practice location
- **Address:** 199 RIMMER STREET, Walnut Grove, MS 39189-0370
- **Phone:** (601) 253-2733 · **Fax:** (601) 253-2733
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): East Central Mississippi Health Care, Inc (NPI 1255387619, Walnut Grove, MS); Rh Emergency Medicine Of Jefferson Davis LLC (NPI 1356103527, Prentiss, MS); Rh Hospitalist Medicine Of Jefferson Davis LLC (NPI 1174385355, Prentiss, MS); Keystone Medical Services Of Ms, Inc (NPI 1174691059, Hazlehurst, MS); Rh Emergency Medicine Of Marion General LLC (NPI 1841064110, Columbia, MS); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Meharry Medical College School Of Medicine, class of 1989
## Record status
- **NPPES last updated:** June 26, 2014
- **Other identifiers:** Medicare ID-Type Unspecified 110001747 (MS); Other P00127232; Medicaid 00116489 (MS); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1063499002) · Data from the CMS NPPES public registry.