Mark Nelson, MD
Mark Nelson, MD is a Rheumatology Physician in San Antonio, TX, registered under NPI 1538140090. 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 3338 OAKWELL COURT SUITE 114, San Antonio, TX 78218. 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 |
|---|---|---|
| G7857 | TX | Rheumatology Physician primary |
This provider holds licence G7857 issued in TX. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Rheumatology
- PAC ID
- 3577586510
- Enrollment ID
- I20060105000388
Medicare enrolment is recorded as approved under the provider type Practitioner - Rheumatology. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Rheumatology covers
An internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and "collagen" diseases. NUCC Health Care Provider Taxonomy, code 207RR0500X
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 | 1538140090 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 10, 2005 |
| Last updated | Oct 22, 2007 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | MD |
| Practice address |
3338 OAKWELL COURT SUITE 114 San Antonio, TX 78218 (210) 656-5000 Fax (210) 656-7892 |
| Other identifiers |
114876902
· Medicaid (TX) |
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 | 5 | 3 | 8 | 1 | 4 | 0 | 0 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 6 | 8 | 2 | 4 | 0 | 0 | 9 |
Sum = 60 · next multiple of 10 = 60 · check digit = 0 · actual last digit = 0
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.