Active NPI
Mary Zahnle, MDI
- Internal Medicine Physician
- Mason City, IA
National Provider Identifier
1598517716
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Internal Medicine Physician
- License
- MD-56357
- Practice address
- 1010 4TH St SW
Ste 305
Mason City, IA 50401-2856 - Phone
- (641) 428-5700
- NPI assigned
- Apr 2, 2024
- Sex
- Female
- 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 |
|---|---|---|---|---|
| Internal Medicine Physician | 207R00000X | MD-56357 | IA | Primary |
Addresses
Primary practice location
1010 4TH St SW
Ste 305
Mason City, IA 50401-2856
Mailing address
1010 4TH St SW
Ste 305
Mason City, IA 50401-2856
Electronic endpoints 1
| Type | Endpoint | Use | Affiliation |
|---|---|---|---|
| Direct Messaging Address | mzahnle3961764@direct.trinity-health.org | Direct |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in IA
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 1
| Enrollment ID | State | Provider type | PAC ID | Details |
|---|---|---|---|---|
| I20240703000795 | IA | Order and Referring Only - Internal Medicine | 9335683168 |
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Master of Divinity
Interoperability endpoints
- mzahnle3961764@direct.trinity-health.org
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1712016000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1787875200000",
"number": "1598517716",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1010 4TH ST SW",
"address_2": "STE 305",
"city": "MASON CITY",
"state": "IA",
"postal_code": "504012856"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1010 4TH ST SW",
"address_2": "STE 305",
"city": "MASON CITY",
"state": "IA",
"postal_code": "504012856",
"telephone_number": "641-428-5700"
}
],
"practiceLocations": [],
"basic": {
"last_name": "ZAHNLE",
"first_name": "MARY",
"credential": "MDI",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2024-04-02",
"last_updated": "2026-08-28",
"certification_date": "2026-08-28",
"status": "A"
},
"taxonomies": [
{
"code": "207R00000X",
"taxonomy_group": "",
"desc": "Internal Medicine",
"state": "IA",
"license": "MD-56357",
"primary": true
}
],
"identifiers": [],
"endpoints": [
{
"endpointType": "DIRECT",
"endpointTypeDescription": "Direct Messaging Address",
"endpoint": "mzahnle3961764@direct.trinity-health.org",
"affiliation": "N",
"endpointDescription": "MercyOne North Iowa Direct Email",
"use": "DIRECT",
"useDescription": "Direct",
"contentType": "OTHER",
"contentTypeDescription": "Other",
"contentOtherDescription": "CCDA",
"address_1": "1010 4th St SW",
"address_2": "Ste 305",
"city": "Mason City",
"state": "IA",
"country_code": "US",
"postal_code": "504012856",
"country_name": "United States",
"address_type": "DOM"
}
],
"other_names": []
}Other providers in Mason City, IA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 28, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.