Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. John William McNeil II, MD

Individual provider Family Medicine Physician · NPI 1003340126

Dr. John William McNeil II, MD is a Family Practice in Merced, California. Graduated from University of California, San Diego School of Medicine in 2015, 11 years ago. Practices with Mercy East Ambulatory Services LLC, a 103-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California and Missouri.

Years since qualifying
11
Trained at
University of California, San Diego School of Medicine
Licensed in
CA, MO
In the registry since
2017
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

333 Mercy Ave
Merced, CA 95340-8319
Phone: (209) 564-5000
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 1722 Clarkson Rd, Chesterfield, MO 63017-4976 — (636) 206-2665
  • 1000 E Primrose St Ste 170, Springfield, MO 65807-5192 — (417) 269-9853

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence A161553 (CA)
Family Medicine Physician Taxonomy 207Q00000X · Licence 2025002188 (MO)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1003340126
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 14, 2017
Last updated in NPPESAugust 4, 2025
Certification dateAugust 4, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF CALIFORNIA, SAN DIEGO SCHOOL OF MEDICINE
Graduated 2015 (11 years in practice)
Group practice Mercy East Ambulatory Services Llc — 103 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

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