DR. JOHN WILLIAM MCNEIL II M.D.
NPI 1003340126
Emergency Medicine in Merced, CA
About Dr. John William Mcneil Ii M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN WILLIAM MCNEIL II M.D. (NPI 1003340126) is an individual emergency medicine provider in Merced, California, licensed in California (A161553) and active in the NPI registry since April 2017. He is enrolled in Medicare PECOS, is affiliated with Cox Medical Centers, and maintains a secondary practice location in Chesterfield.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
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
Dr. John William Mcneil Ii 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
6Medicare enrollment records show John Mcneil reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Merced, CA 95340
- Reassigned Medicare billing, California enrollment
- 141 clinicians in this Medicare group
Turlock, CA 95382
- Reassigned Medicare billing, California enrollment
- 2,323 clinicians in this Medicare group
Newport Beach, CA 92663
- Reassigned Medicare billing, California enrollment
- 529 clinicians in this Medicare group
Irvine, CA 92618
- Reassigned Medicare billing, California enrollment
- 89 clinicians in this Medicare group
Springfield, MO 65807
- Reassigned Medicare billing, Missouri enrollment
- 94 clinicians in this Medicare group
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
- 169 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 10
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.
Cox Medical Centers
Acute Care Hospitals · Springfield, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 95340 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.
MERCED, CA 95340
MERCED, CA 95340
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 Mcneil's NPI number?
The NPI number for John Mcneil is 1003340126. It was assigned to this individual provider in the NPPES registry on April 14, 2017.
Where is John Mcneil located?
John Mcneil practices at 333 Mercy Ave, Merced, CA 95340. The listed phone number is (209) 564-5000.
What is John Mcneil's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is John Mcneil enrolled in Medicare?
Yes. John Mcneil 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 Mcneil's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Mcneil reassigns Medicare benefits to 6 organizations: San Joaquin Emergency Medical Associates (Merced, CA), Cep America - California (Turlock, CA), Hoag Clinic (Newport Beach, CA), Hmts, Inc (Irvine, CA), Mercy Southern Missouri Ambulatory Services LLC (Springfield, MO) and 1 more organization, 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 Mcneil's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is John Mcneil affiliated with any hospitals?
According to CMS data, John Mcneil is affiliated with Cox Medical Centers.
When was this NPI record last updated?
The NPPES record for John Mcneil was last updated on September 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 46 days 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.
# Dr. John William Mcneil II, M.D. · NPI 1003340126
Emergency Medicine physician in Merced, California. Individual provider, active in the CMS NPPES registry since April 14, 2017.
## Identity
- **NPI:** 1003340126 (Entity type: Individual)
- **Enumerated:** April 14, 2017
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A161553 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 333 MERCY AVE, Merced, CA 95340-8319
- **Phone:** (209) 564-5000
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): San Joaquin Emergency Medical Associates (NPI 1588960413, Merced, CA); Cep America - California (NPI 1932686367, Turlock, CA); Hoag Clinic (NPI 1942799523, Newport Beach, CA); Hmts, Inc (NPI 1326828575, Irvine, CA); Mercy Southern Missouri Ambulatory Services LLC (NPI 1871094052, Springfield, MO); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Diego School Of Medicine, class of 2015
## Record status
- **NPPES last updated:** September 18, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1003340126) · Data from the CMS NPPES public registry.