Gary Ruelas, D.O., PH.D.
Gary Ruelas, D.O., PH.D. is a Neuromusculoskeletal Medicine & OMM Physician in Orange, CA, registered under NPI 1154461549. This provider registers 4 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 707 E CHAPMAN AVE, Orange, CA 92866. 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 |
|---|---|---|
| 20A7737 | CA | Neuromusculoskeletal Medicine & OMM… primary |
| PSY13999 | CA | Clinical Neuropsychologist |
| PSY13999 | CA | Clinical Psychologist |
| 20A7737 | CA | Family Medicine Physician |
This provider holds licence 20A7737 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 Neuromusculoskeletal Medicine & OMM covers
The Neuromusculoskeletal Medicine and Osteopathic Manipulative Medicine physician directs special attention to the neuromusculoskeletal system and its interaction with other body systems. Neuromusculoskeletal Medicine and Osteopathic Manipulative Medicine encompasses increased knowledge and understanding of osteopathic principles and practice and heightened technical skills of osteopathic manipulative medicine, and integrates each of these into the management of pediatric, adolescent, adult, and geriatric patients. NUCC Health Care Provider Taxonomy, code 204D00000X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 204D00000X | Neuromusculoskeletal Medicine & OMM Physician | 20A7737 | CA | primary |
| 103G00000X | Clinical Neuropsychologist | PSY13999 | CA | |
| 103TC0700X | Clinical Psychologist Clinical | PSY13999 | CA | |
| 207Q00000X | Family Medicine Physician | 20A7737 | 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 | 1154461549 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 7, 2007 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | D.O., PH.D. |
| Practice address |
707 E CHAPMAN AVE Orange, CA 92866 (714) 771-2880 Fax (714) 771-2693 |
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 | 1 | 5 | 4 | 4 | 6 | 1 | 5 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 1 | 4 | 8 | 6 | 2 | 5 | 8 |
Sum = 61 · next multiple of 10 = 70 · check digit = 9 · actual last digit = 9
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.