NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John L Mayfield, DOCTOR OF CHIROPRACT

Chiropractor in Grass Valley, CA · enumerated 2006 · practices at P. Haines Ely, M.D. Inc..

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1255366381

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name John L Mayfield
Credential DOCTOR OF CHIROPRACT
Sex Male
Practice address 565 Brunswick Road, Suite 12, Grass Valley, CA, 95945
Phone (530) 272-8839
Fax (530) 272-9057
Enumeration date Jul 11, 2006
Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License DC10905 (CA) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does John Mayfield practice?
The practice location on file with NPPES is in Grass Valley, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for John Mayfield?
The National Provider Identifier (NPI) for John Mayfield is 1255366381, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.