Richard Greczanik, D.O.
Richard Greczanik, D.O. is a Family Medicine Physician in Tyler, TX, registered under NPI 1689823429. 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 3593 E GRANDE BLVD, Tyler, TX 75707. 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 |
|---|---|---|
| R1957 | TX | Family Medicine Physician primary |
| 58.001880 | OH | Family Medicine Physician |
| 34.009584 | OH | Family Medicine Physician |
Licences are recorded in 2 states: TX, OH. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Family Practice
- PAC ID
- 5698813491
- Enrollment ID
- I20170404000813
Medicare enrolment is recorded as approved under the provider type Practitioner - Family Practice. 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.
Licensed in 2 states
This provider holds licences in 2 states: Ohio and Texas. The practice address on file is in Tyler, TX, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- R1957
- Specialty
- Family Medicine Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Family Medicine covers
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity. NUCC Health Care Provider Taxonomy, code 207Q00000X
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 | |
|---|---|---|---|---|
| 207Q00000X | Family Medicine Physician | R1957 | TX | primary |
| 207Q00000X | Family Medicine Physician | 58.001880 | OH | |
| 207Q00000X | Family Medicine Physician | 34.009584 | OH |
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 | 1689823429 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 17, 2008 |
| Last updated | Nov 19, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | D.O. |
| Practice address |
3593 E GRANDE BLVD Tyler, TX 75707 (903) 839-2585 |
| Mailing address |
PO BOX 846098 Dallas, TX 75284 |
| Other identifiers |
370175701
· Medicaid (TX) 75-0818167-022 · Other (TX) 75-2616977-001 · Other (TX) 75-2616977-129 · Other (TX) P01877165 · Other (TX) 8GQ047 · Other (TX) 8GQ046 · Other (TX) 370175702 · Medicaid (TX) 75-2616977-002 · Other (TX) 75-2616977-028 · 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 | 6 | 8 | 9 | 8 | 2 | 3 | 4 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 7 | 9 | 7 | 2 | 6 | 4 | 4 |
Sum = 71 · next multiple of 10 = 80 · 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.