John Hamilton, MD
John Hamilton, MD is an Orthopaedic Surgery Physician in Marshalltown, IA, registered under NPI 1982720231.
Getting there
The practice address on file is 421 E MERLE HIBBS BLVD, Marshalltown, IA 50158. 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 |
|---|---|---|
| 48358 | IA | Orthopaedic Surgery Physician primary |
| 53573 | MN | Orthopaedic Surgery Physician |
| 57-012100 | OH | Orthopaedic Surgery Physician |
| 69507 | WI | Orthopaedic Surgery Physician |
Licences are recorded in 4 states: IA, MN, OH, WI. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Orthopedic Surgery
- PAC ID
- 3072785211
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Wisconsin | I20181001000972 | Practitioner - Orthopedic Surgery |
| Iowa | I20210406000750 | Practitioner - Orthopedic Surgery |
Medicare enrolment is recorded as approved under the provider type Practitioner - Orthopedic Surgery. There are 2 separate enrolment records across 2 states (WI, IA). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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 4 states
This provider holds licences in 4 states: Iowa, Minnesota, Ohio and Wisconsin. The practice address on file is in Marshalltown, IA, 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
- 48358
- Specialty
- Orthopaedic Surgery 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 Orthopaedic Surgery covers
An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system. NUCC Health Care Provider Taxonomy, code 207X00000X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207X00000X | Orthopaedic Surgery Physician | 48358 | IA | primary |
| 207X00000X | Orthopaedic Surgery Physician | 53573 | MN | |
| 207X00000X | Orthopaedic Surgery Physician | 57-012100 | OH | |
| 207X00000X | Orthopaedic Surgery Physician | 69507 | WI |
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 | 1982720231 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 21, 2007 |
| Last updated | Jul 17, 2023 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
421 E MERLE HIBBS BLVD Marshalltown, IA 50158 (641) 844-2213 Fax (641) 752-5132 |
| Mailing address |
1215 DUFF AVE Ames, IA 50010 |
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 | 9 | 8 | 2 | 7 | 2 | 0 | 2 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 7 | 2 | 5 | 2 | 0 | 2 | 6 |
Sum = 59 · next multiple of 10 = 60 · check digit = 1 · actual last digit = 1
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.