MR. WARREN L. NIX CRNA
NPI 1427353143
Nurse Anesthetist, Certified Registered in Lawton, OK
About Mr. Warren L. Nix Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. WARREN L. NIX CRNA (NPI 1427353143) is an individual nurse anesthetist, certified registered in Lawton, Oklahoma, licensed in Oklahoma (71393) and active in the NPI registry since January 2011. He is affiliated with Duncan Regional Hospital, Inc and is a graduate of Other (2010).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
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
Mr. Warren L. Nix 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 Warren Nix reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Duncan, OK 75533
- Reassigned Medicare billing, Oklahoma enrollment
- 12 clinicians in this Medicare group
Elk City, OK 73644
- Reassigned Medicare billing, Oklahoma enrollment
- 108 clinicians in this Medicare group
Ada, OK 74820
- Reassigned Medicare billing, Oklahoma enrollment
- 5 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 8
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.
Duncan Regional Hospital, Inc
Acute Care Hospitals · Duncan, OKPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 73505 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.
LAWTON, OK 73505
LAWTON, OK 73505
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 Warren Nix's NPI number?
The NPI number for Warren Nix is 1427353143. It was assigned to this individual provider in the NPPES registry on January 12, 2011.
Where is Warren Nix located?
Warren Nix practices at 3401 W Gore Blvd, Lawton, OK 73505. The listed phone number is (580) 585-5534.
What is Warren Nix's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Warren Nix enrolled in Medicare?
Yes. Warren Nix 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 Warren Nix's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Warren Nix reassigns Medicare benefits to 3 organizations: Duncan Anesthesia Associates Inc (Duncan, OK), Western Oklahoma Anesthesia Consultants PLLC (Elk City, OK) and Sc Anesthesia LLC (Ada, OK). 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 Warren Nix's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Warren Nix accept?
Health plans from Blue Cross and Blue Shield of Oklahoma list Warren Nix 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 Warren Nix affiliated with any hospitals?
According to CMS data, Warren Nix is affiliated with Duncan Regional Hospital, Inc.
When was this NPI record last updated?
The NPPES record for Warren Nix 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.
# Mr. Warren L. Nix, CRNA · NPI 1427353143
Nurse Anesthetist, Certified Registered physician in Lawton, Oklahoma. Individual provider, active in the CMS NPPES registry since January 12, 2011.
## Identity
- **NPI:** 1427353143 (Entity type: Individual)
- **Enumerated:** January 12, 2011
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** 71393 (Oklahoma)
- **Sole proprietor:** No
## Practice location
- **Address:** 3401 W GORE BLVD, Lawton, OK 73505-6332
- **Phone:** (580) 585-5534 · **Fax:** (580) 585-5458
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Duncan Anesthesia Associates Inc (NPI 1205897410, Duncan, OK); Western Oklahoma Anesthesia Consultants PLLC (NPI 1881102614, Elk City, OK); Sc Anesthesia LLC (NPI 1962106013, Ada, OK) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2010
## Record status
- **NPPES last updated:** January 12, 2011
- **Other identifiers:** Other 71393 (OK)
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Source: [NPI Profile](https://npiprofile.com/npi/1427353143) · Data from the CMS NPPES public registry.