John Adam Hamilton, MD
Orthopedic Surgery · Marshalltown, IA
At a glance
421 E Merle Hibbs Blvd, Marshalltown, IA 50158-1992
Published activity: Hip replacement · Knee replacement · Lower limb (leg) arthroscopy (minimally invasive joint repair). View counts and coverage
NPPES record updated Jul 17, 2023. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
421 E Merle Hibbs BlvdMarshalltown, IA 50158-1992
Additional reported practice locations
1233 34Th St NwBemidji, MN 56601
Phone: 2183335000 1233 34Th St Nw
Bemidji, MN 56601
Phone: 2183335000 501 N 10Th St
Manitowoc, WI 54220
Phone: 9206826376
Fax: 9206520115
Education & affiliations
- Medical / professional school
- Creighton University School Of Medicine
- Graduation year
- 2006
- CMS specialties
- Orthopedic Surgery
Practice groups
Reported hospital affiliations
- Franklin General Hospital Hampton, IA
- Mary Greeley Medical Center Ames, IA
- Unitypoint Health - Marshalltown Marshalltown, IA
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Hip replacement | 1-10 |
| Knee replacement | 29 |
| Lower limb (leg) arthroscopy (minimally invasive joint repair) | 1-10 |
| Melanoma (skin cancer) excision | 1-10 |
| Removal of tissue | 1-10 |
| Upper limb (arm) arthroscopy (minimally invasive joint repair) | 34 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $261.93 |
Reporting companies
| Company | Amount |
|---|---|
| STRYKER CORPORATION | $160.10 |
| SMITH+NEPHEW, INC. | $87.91 |
| VERTEX PHARMACEUTICALS INCORPORATED | $13.92 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Orthopedic Surgery
- Taxonomy code
- 207X00000X
- Enumeration date
- Mar 21, 2007
- Record updated
- Jul 17, 2023
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
207X00000X
License reported: 53573 MN
207X00000X
License reported: 57-012100 OH
207X00000X
License reported: 69507 WI
207X00000X · Primary
License reported: 48358 IA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
421 E Merle Hibbs BlvdMarshalltown, IA 50158-1992
- Phone
- (641) 844-2213
- Fax
- (641) 752-5132
Mailing address
1215 DUFF AVEAMES, IA 500105469
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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