JOHN WILLIAMS CRNA
NPI 1154870301
Nurse Anesthetist, Certified Registered in Bakersfield, CA
About John Williams Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN WILLIAMS CRNA (NPI 1154870301) is an individual nurse anesthetist, certified registered in Bakersfield, California, licensed in California (NA95000630) and active in the NPI registry since September 2016. He is a graduate of Other (2016).
NPPES Registry Identity
Specialties & Licenses
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
John Williams 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
8Medicare enrollment records show John Williams reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Bakersfield, CA 93306
- Reassigned Medicare billing, California enrollment
- 96 clinicians in this Medicare group
Bakersfield, CA 93311
- Reassigned Medicare billing, California enrollment
- 99 clinicians in this Medicare group
Lancaster, CA 93534
- Reassigned Medicare billing, California enrollment
- 13,921 clinicians in this Medicare group
Tarzana, CA 91356
- Reassigned Medicare billing, California enrollment
- 44 clinicians in this Medicare group
Santa Monica, CA 90404
- Reassigned Medicare billing, California enrollment
- 57 clinicians in this Medicare group
Fresno, CA 93611
- Reassigned Medicare billing, California enrollment
- 508 clinicians in this Medicare group
Fresno, CA 93720
- Reassigned Medicare billing, California enrollment
- 293 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 270 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
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 93306 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.
BAKERSFIELD, CA 93306
BAKERSFIELD, CA 93306
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 John Williams's NPI number?
The NPI number for John Williams is 1154870301. It was assigned to this individual provider in the NPPES registry on September 29, 2016.
Where is John Williams located?
John Williams practices at 1700 Mount Vernon Ave, Bakersfield, CA 93306. The listed phone number is (661) 326-2000.
What is John Williams's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is John Williams enrolled in Medicare?
Yes. John Williams 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 John Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Williams reassigns Medicare benefits to 8 organizations: Regional Anesthesia Associates Inc (Bakersfield, CA), Advanced Anesthesia Specialists A Medical Corporation (Bakersfield, CA), Southern California Permanente Medical Group (Lancaster, CA), Scq Anesthesia A Professional Nursing Corporation (Tarzana, CA), Digestive Health Associates Of Southern California (Santa Monica, CA) 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 John Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for John Williams was last updated on October 11, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# John Williams, CRNA · NPI 1154870301
Nurse Anesthetist, Certified Registered physician in Bakersfield, California. Individual provider, active in the CMS NPPES registry since September 29, 2016.
## Identity
- **NPI:** 1154870301 (Entity type: Individual)
- **Enumerated:** September 29, 2016
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** NA95000630 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1700 MOUNT VERNON AVE, Bakersfield, CA 93306-4018
- **Phone:** (661) 326-2000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): Regional Anesthesia Associates Inc (NPI 1811442874, Bakersfield, CA); Advanced Anesthesia Specialists A Medical Corporation (NPI 1083130553, Bakersfield, CA); Southern California Permanente Medical Group (NPI 1982863783, Lancaster, CA); Scq Anesthesia A Professional Nursing Corporation (NPI 1689381105, Tarzana, CA); Digestive Health Associates Of Southern California (NPI 1043098619, Santa Monica, CA); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** October 11, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1154870301) · Data from the CMS NPPES public registry.