Charles Davis, D.C.
Charles Davis, D.C. is a provider specialising in Occupational Health Chiropractor in Glendora, CA, registered under NPI 1659350924. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 2028 E ROUTE 66 #202, Glendora, CA 91740. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 17458 | CA | Occupational Health Chiropractor |
| 17458 | CA | Sports Physician Chiropractor |
| 17458 | CA | Neurology Chiropractor |
This provider holds licence 17458 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Occupational Health covers
Occupational Health is that specialty within the chiropractic profession that deals with the prevention and management of work related injuries. It also considers and assists clients with State and Federal Compliance assistance. Occupational Health goes much farther than simply treating injured workers however. This may mean working with clients to promote optimum safety and ergonomic principles, interacting with the injured worker to promote safety and prevent future injuries, assisting a company with accident investigation to identify root cause, redesigning a workstation to eliminate hazards, working with safety teams, providing training programs etc. The list of potential services that the specialist can interact with a client company or patient is lengthy and varied involving both in office services as well as on site services. NUCC Health Care Provider Taxonomy, code 111NX0100X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 111NX0100X | Occupational Health Chiropractor Occupational Health | 17458 | CA | |
| 111NS0005X | Sports Physician Chiropractor Sports Physician | 17458 | CA | |
| 111NN0400X | Neurology Chiropractor Neurology | 17458 | CA |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1659350924 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 13, 2006 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | D.C. |
| Practice address |
2028 E ROUTE 66 #202 Glendora, CA 91740 (626) 732-9611 |
| Mailing address |
417 W FOOTHILL BLVD #401 Glendora, CA 91741 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 6 | 5 | 9 | 3 | 5 | 0 | 9 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 1 | 9 | 6 | 5 | 0 | 9 | 4 |
Sum = 66 · next multiple of 10 = 70 · check digit = 4 · actual last digit = 4
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.