WILLIAM B LANDRY III M.D.
NPI 1689864100
Anesthesiology in Slidell, LA
About William B Landry Iii M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM B LANDRY III M.D. (NPI 1689864100) is an individual anesthesiology provider in Slidell, Louisiana, licensed in Louisiana (MD.201686) and active in the NPI registry since July 2007. He is enrolled in Medicare PECOS, is affiliated with Ascension Sacred Heart Bay, and is a graduate of Tulane University School Of Medicine (2006).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
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
William B Landry Iii M.d. 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
10Medicare enrollment records show William Landry reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Slidell, LA 70461
- Reassigned Medicare billing, Louisiana enrollment
- 4,559 clinicians in this Medicare group
Metairie, LA 70001
- Reassigned Medicare billing, Louisiana enrollment
- 71 clinicians in this Medicare group
New Orleans, LA 70118
- Reassigned Medicare billing, Louisiana enrollment
- 519 clinicians in this Medicare group
Gulfport, MS 39503
- Reassigned Medicare billing, Mississippi enrollment
- 65 clinicians in this Medicare group
La Place, LA 70068
- Reassigned Medicare billing, Louisiana enrollment
- 482 clinicians in this Medicare group
Baton Rouge, LA 70809
- Reassigned Medicare billing, Louisiana enrollment
- 141 clinicians in this Medicare group
New Iberia, LA 70563
- Reassigned Medicare billing, Louisiana enrollment
- 470 clinicians in this Medicare group
Jackson, MS 39208
- Reassigned Medicare billing, Mississippi enrollment
- 154 clinicians in this Medicare group
Memphis, TN 38125
- Reassigned Medicare billing, Mississippi enrollment
- 284 clinicians in this Medicare group
Naples, FL 34119
- Reassigned Medicare billing, Florida enrollment
- 767 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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ascension Sacred Heart Bay
Acute Care Hospitals · Panama City, FLMemorial Hospital At Gulfport
Acute Care Hospitals · Gulfport, MSSinging River Health System
Acute Care Hospitals · Pascagoula, MSSinging River Gulfport
Acute Care Hospitals · Gulfport, MSOther Providers at the Same Location NPPES 19
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SLIDELL, LA 70461
SLIDELL, LA 70461
SLIDELL, LA 70461
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 William Landry's NPI number?
The NPI number for William Landry is 1689864100. It was assigned to this individual provider in the NPPES registry on July 31, 2007.
Where is William Landry located?
William Landry practices at 100 Medical Center Drive, Slidell, LA 70461. The listed phone number is (985) 646-5082.
What is William Landry's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is William Landry enrolled in Medicare?
Yes. William Landry 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 William Landry's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Landry reassigns Medicare benefits to 10 organizations: Ochsner Clinic LLC (Slidell, LA), Galleria Anesthesia Associates, LLC (Metairie, LA), Childrens Hospital Anesthesia Corporation (New Orleans, LA), Singing River Gulfport (Gulfport, MS), Zephyr Anesthesia, LLC (La Place, LA) and 5 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 William Landry's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Landry 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 William Landry 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 William Landry affiliated with any hospitals?
According to CMS data, William Landry is affiliated with Ascension Sacred Heart Bay, Memorial Hospital At Gulfport, Singing River Health System and Singing River Gulfport.
When was this NPI record last updated?
The NPPES record for William Landry was last updated on January 12, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# William B Landry III, M.D. · NPI 1689864100
Anesthesiology physician in Slidell, Louisiana. Individual provider, active in the CMS NPPES registry since July 31, 2007.
## Identity
- **NPI:** 1689864100 (Entity type: Individual)
- **Enumerated:** July 31, 2007
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** MD.201686 (Louisiana)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 MEDICAL CENTER DRIVE, Slidell, LA 70461-5520
- **Phone:** (985) 646-5082
## 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:** 10 organizations under Medicare reassignment (form CMS-855R): Ochsner Clinic LLC (NPI 1407314248, Slidell, LA); Galleria Anesthesia Associates, LLC (NPI 1962966796, Metairie, LA); Childrens Hospital Anesthesia Corporation (NPI 1649362740, New Orleans, LA); Singing River Gulfport (NPI 1780312504, Gulfport, MS); Zephyr Anesthesia, LLC (NPI 1891087458, La Place, LA); and 5 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Tulane University School Of Medicine, class of 2006
## Record status
- **NPPES last updated:** January 12, 2011
- **Other identifiers:** Medicare PIN 4P0537061 (LA); Medicaid 07772504 (MS); Medicaid 1077500 (LA)
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Source: [NPI Profile](https://npiprofile.com/npi/1689864100) · Data from the CMS NPPES public registry.