Billie Marek, MD
Billie Marek, MD is a Medical Oncology Physician in Mcallen, TX, registered under NPI 1346282209.
Getting there
The practice address on file is 1901 S 2ND ST, Mcallen, TX 78503. 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 |
|---|---|---|
| H3700 | TX | Medical Oncology Physician primary |
This provider holds licence H3700 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 - Medical Oncology
- PAC ID
- 1355352139
- Enrollment ID
- I20060508000652
Medicare enrolment is recorded as approved under the provider type Practitioner - Medical Oncology. 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 Medical Oncology covers
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer. NUCC Health Care Provider Taxonomy, code 207RX0202X
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 | 1346282209 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 12, 2006 |
| Last updated | Aug 31, 2017 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
1901 S 2ND ST Mcallen, TX 78503 (956) 687-5150 Fax (956) 687-9546 |
| Mailing address |
PO BOX 911230 Dallas, TX 75391 |
| Other identifiers |
132633202
· Medicaid (TX) 132633204 · Other (TX) 132633205 · Medicaid (TX) 132633201 · Medicaid (TX) 132633207 · Medicaid (TX) 8R1496 · Other (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 | 3 | 4 | 6 | 2 | 8 | 2 | 2 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 3 | 8 | 6 | 4 | 8 | 4 | 2 | 0 |
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.