Dianne Sand, D.C.
Dianne Sand, D.C. is a provider specialising in Neurology Chiropractor in San Marcos, TX, registered under NPI 1043356694. This provider registers 2 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 330 S C M ALLEN PKWY, San Marcos, TX 78666. 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
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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 Neurology covers
Chiropractic Neurology is defined as the field of functional neurology that engages the internal - and external environment of the individual in a structured and targeted approach to affect positive changes in the nervous system and consequently the physiology and behavior of an individual. Chiropractic Neurologists are board-certified specialists in non-drug, non-surgical care for those with neurologically based health problems. There are many conditions people suffer from that are in this broad category: learning and attention disorders, headaches, vertigo, pain syndromes, developmental disorders, nerve injury, spinal cord injury, head injury or stroke, movement disorders, and many other conditions. NUCC Health Care Provider Taxonomy, code 111NN0400X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 111NN0400X | Neurology Chiropractor Neurology | — | TX | primary |
| 111N00000X | Chiropractor | — | TX |
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 | 1043356694 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 30, 2007 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | D.C. |
| Practice address |
330 S C M ALLEN PKWY San Marcos, TX 78666 (512) 353-2882 Fax (512) 353-0132 |
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 | 0 | 4 | 3 | 3 | 5 | 6 | 6 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 8 | 3 | 6 | 5 | 3 | 6 | 9 |
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.