WILLIAM MCMAHAN CRNA
NPI 1316002587
Nurse Anesthetist, Certified Registered in Biloxi, MS
About William Mcmahan Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM MCMAHAN CRNA (NPI 1316002587) is an individual nurse anesthetist, certified registered in Biloxi, Mississippi, licensed in Mississippi (R862339) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS, is affiliated with Singing River Gulfport, and is a graduate of Other (2000).
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 Mcmahan Crna 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
3Medicare enrollment records show William Mcmahan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Ocean Springs, MS 39564
- Reassigned Medicare billing, Mississippi enrollment
- Also billed through NPI 1740918937 (Mississippi)
- 450 clinicians in this Medicare group
Gulfport, MS 39503
- Reassigned Medicare billing, Mississippi enrollment
- Also billed through NPI 1780312504 (Mississippi)
- 298 clinicians in this Medicare group
Pascagoula, MS 39581
- Reassigned Medicare billing, Mississippi enrollment
- 69 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 3
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Singing River Gulfport
Acute Care Hospitals · Gulfport, MSPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 39530 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BILOXI, MS 39530
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 Mcmahan's NPI number?
The NPI number for William Mcmahan is 1316002587. It was assigned to this individual provider in the NPPES registry on December 27, 2006.
Where is William Mcmahan located?
William Mcmahan practices at 150 Reynoir St, Biloxi, MS 39530. The listed phone number is (228) 385-1451.
What is William Mcmahan's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is William Mcmahan enrolled in Medicare?
Yes. William Mcmahan 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 Mcmahan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Mcmahan reassigns Medicare benefits to 3 organizations: Singing River Health System (Ocean Springs, MS), Singing River Gulfport (Gulfport, MS) and Jackson County Anesthesia (Pascagoula, MS). 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 Mcmahan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Mcmahan accept?
Health plans from Blue Cross and Blue Shield of Alabama list William Mcmahan 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 Mcmahan affiliated with any hospitals?
According to CMS data, William Mcmahan is affiliated with Singing River Gulfport.
When was this NPI record last updated?
The NPPES record for William Mcmahan was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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 Mcmahan, CRNA · NPI 1316002587
Nurse Anesthetist, Certified Registered physician in Biloxi, Mississippi. Individual provider, active in the CMS NPPES registry since December 27, 2006.
## Identity
- **NPI:** 1316002587 (Entity type: Individual)
- **Enumerated:** December 27, 2006
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** R862339 (Mississippi)
- **Sole proprietor:** No
## Practice location
- **Address:** 150 REYNOIR ST, Biloxi, MS 39530-4130
- **Phone:** (228) 385-1451
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Singing River Health System (NPI 1053528109, Ocean Springs, MS); Singing River Gulfport (NPI 1861010159, Gulfport, MS); Jackson County Anesthesia (NPI 1922159219, Pascagoula, MS) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2000
## Record status
- **NPPES last updated:** July 8, 2007
- **Other identifiers:** Medicare UPIN P15543 (MS); Medicare ID-Type Unspecified 430001733 (MS); Medicaid 00122798 (MS)
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Source: [NPI Profile](https://npiprofile.com/npi/1316002587) · Data from the CMS NPPES public registry.