William Knapp, O.D.
William Knapp, O.D. is a provider specialising in Sports Vision Optometrist in Upper Sandusky, OH, registered under NPI 1437131927.
Getting there
The practice address on file is 212 E WYANDOT AVE, Upper Sandusky, OH 43351. 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 |
|---|---|---|
| 4759/T1563 | OH | Sports Vision Optometrist primary |
This provider holds licence 4759/T1563 issued in OH. 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 - Optometry
- PAC ID
- 0547394769
- Enrollment ID
- I20100810000524
Medicare enrolment is recorded as approved under the provider type Practitioner - Optometry. 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 Sports Vision covers
An optometrist who offers services designed to care for unique vision care needs of athletes, which may include one of more of the following services: corrective vision care unique to a specific sporting environment; protective eyewear for the prevention of sports-related injuries; vision enhancement - which may include vision therapy and techniques to improve visual skills specific to the athlete's sport. NUCC Health Care Provider Taxonomy, code 152WS0006X
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 | 1437131927 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 18, 2005 |
| Last updated | Aug 21, 2008 |
| Status | Active |
| Sole proprietor | No |
| Credential | O.D. |
| Practice address |
212 E WYANDOT AVE Upper Sandusky, OH 43351 (419) 294-2421 Fax (419) 294-2499 |
| Mailing address |
PO BOX 540 Upper Sandusky, OH 43351 |
| Other identifiers |
2031661
· Medicaid (OH) |
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 | 4 | 3 | 7 | 1 | 3 | 1 | 9 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 6 | 7 | 2 | 3 | 2 | 9 | 4 |
Sum = 63 · next multiple of 10 = 70 · check digit = 7 · actual last digit = 7
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.