Patrick Kolker, DDS
Patrick Kolker, DDS is a provider specialising in General Practice Dentistry in Mason City, IA, registered under NPI 1003345000. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Mason City, based on OpenStreetMap data collected Sep 20, 2026. Parking is available about 0.23 mi away. The nearest transit stop is 0.40 mi away.
Getting here and what is nearby
Hotel Park Inn (historic Frank Lloyd Wright) 396 ft ~2 min
Restaurant Suzie Q Cafe 499 ft ~2 min
Transit 0.20 mi ~5 min
Parking 0.20 mi ~5 min
Parking 0.22 mi ~5 min
Parking 0.23 mi ~5 min
Grocery Fareway 0.25 mi ~6 min
400 North Delaware Avenue, Mason City 50401
Transit 0.30 mi ~7 min
Hotel Econo Lodge Inn & Suites 0.35 mi ~8 min
Transit 0.40 mi ~8 min
Restaurant Hardee's 0.41 mi ~9 min
Hotel Comfort Inn & Suites 0.48 mi ~10 min
410 5th St SW
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| DDS-09418 | IA | General Practice Dentistry primary |
This provider holds licence DDS-09418 issued in IA. 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 General Practice covers
A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs. NUCC Health Care Provider Taxonomy, code 1223G0001X
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 | 1003345000 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 5, 2017 |
| Last updated | Jun 5, 2017 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | DDS |
| Practice address |
23 N FEDERAL AVE Mason City, IA 50401 (641) 423-4225 |
| Mailing address |
124 35TH PL W Clear Lake, IA 50428 |
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 | 0 | 0 | 3 | 3 | 4 | 5 | 0 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 4 | 1 | 0 | 0 |
Sum = 40 · next multiple of 10 = 40 · 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.