Active NPI
Robert John Cak, MD
- Surgery Physician
- Waterloo, IA
National Provider Identifier
1609829688
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Surgery Physician
- License
- 21323
- Practice address
- 1753 W Ridgeway Ave
Ste 107
Waterloo, IA 50701-4588 - Phone
- (319) 833-5907
- Fax
- (319) 833-5908
- NPI assigned
- May 18, 2006
- Last updated
- Jul 13, 2026
- Sex
- Male
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Surgery Physician | 208600000X | 21323 | IA | Primary |
Addresses
Primary practice location
1753 W Ridgeway Ave
Ste 107
Waterloo, IA 50701-4588
Mailing address
PO Box 2758
Waterloo, IA 50704-2758
Phone (319) 833-5907
Other identifiers 3
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 2151605 | Medicaid | IA | |
| 19685 | Other | IA | WELLMARK INS PLAN |
| 42141730704 | Other | IA | JOHN DEERE HEALTH INS PLA |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 21323 | IA | MD | Surgery Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Floyd County Memorial Hospital Commission | Past | Accepting new patients |
Organizations & group practices 1
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.
-
- Critical Access Hospital
- Charles City, IA
- NPI 1265402390
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1147910400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1609829688",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "PO BOX 2758",
"city": "WATERLOO",
"state": "IA",
"postal_code": "507042758",
"telephone_number": "319-833-5907",
"fax_number": "319-833-5908"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1753 W RIDGEWAY AVE",
"address_2": "STE 107",
"city": "WATERLOO",
"state": "IA",
"postal_code": "507014588",
"telephone_number": "319-833-5907",
"fax_number": "319-833-5908"
}
],
"practiceLocations": [],
"basic": {
"last_name": "CAK",
"first_name": "ROBERT",
"middle_name": "JOHN",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2006-05-18",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "208600000X",
"taxonomy_group": "",
"desc": "Surgery",
"state": "IA",
"license": "21323",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "2151605",
"state": "IA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "WELLMARK INS PLAN",
"identifier": "19685",
"state": "IA"
},
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "JOHN DEERE HEALTH INS PLA",
"identifier": "42141730704",
"state": "IA"
}
],
"endpoints": [],
"other_names": []
}Other providers in Waterloo, IA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.