Active NPI
Aaron Thomas Byczynski
- Internal Medicine Physician
- Milwaukee, WI
National Provider Identifier
1457054942
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Internal Medicine Physician
- License
- 81699
- Practice address
- 945 N 12TH St
Milwaukee, WI 53233-1305 - Phone
- (414) 219-2000
- NPI assigned
- Mar 23, 2023
- 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 |
|---|---|---|---|---|
| Internal Medicine Physician | 207R00000X | 81699 | WI | Primary |
Addresses
Primary practice location
945 N 12TH St
Milwaukee, WI 53233-1305
Mailing address
PO Box 735044
Chicago, IL 60673-5044
Phone (800) 326-2250
Other practice location 1
8701 Watertown Plank Rd
Milwaukee, WI 53226-3548
Phone (414) 955-4575
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 100257950 | Medicaid | WI |
Electronic endpoints 3
| Type | Endpoint | Use | Affiliation |
|---|---|---|---|
| CONNECT URL | https://esmd.abilitynetwork.com:8291/Gateway/DocumentSubmission/2_0/NhinService/XDRRequest_Service | Other | Ability Network |
| Direct Messaging Address | abyczynski456187@direct.myadvocateaurora.org | Direct | |
| FHIR URL | https://EpicFHIR.aurora.org/FHIR/MYAURORA/api/FHIR/DSTU2/ |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in WI
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 1
Care Compare profile
Medicare Care Compare- Specialty
- Internal Medicine
- Education
- West Virginia School of Osteopathic Medicine, 2023
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
Practice addresses (Care Compare)
945 N 12TH St
Milwaukee, WI 53233-1305
Phone (414) 219-7300
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
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 and National Provider Directory roles.
-
- Certified Registered Nurse Anesthetist
- Milwaukee, WI
- NPI 1427271378
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1679529600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1784851200000",
"number": "1457054942",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "PO BOX 735044",
"city": "CHICAGO",
"state": "IL",
"postal_code": "606735044",
"telephone_number": "800-326-2250"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "945 N 12TH ST",
"city": "MILWAUKEE",
"state": "WI",
"postal_code": "532331305",
"telephone_number": "414-219-2000"
}
],
"practiceLocations": [
{
"address_1": "8701 Watertown Plank Rd",
"address_purpose": "LOCATION",
"city": "Milwaukee",
"state": "WI",
"postal_code": "532263548",
"country_code": "US",
"telephone_number": "414-955-4575",
"country_name": "United States",
"address_type": "DOM"
}
],
"basic": {
"last_name": "BYCZYNSKI",
"first_name": "AARON",
"middle_name": "THOMAS",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2023-03-23",
"last_updated": "2026-07-24",
"certification_date": "2026-07-24",
"status": "A"
},
"taxonomies": [
{
"code": "207R00000X",
"taxonomy_group": "",
"desc": "Internal Medicine",
"state": "WI",
"license": "81699",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "100257950",
"state": "WI"
}
],
"endpoints": [
{
"endpointType": "CONNECT",
"endpointTypeDescription": "CONNECT URL",
"endpoint": "https://esmd.abilitynetwork.com:8291/Gateway/DocumentSubmission/2_0/NhinService/XDRRequest_Service",
"affiliation": "Y",
"endpointDescription": "2.16.840.1.113883.3.667.2",
"affiliationName": "Ability Network",
"use": "OTHER",
"useDescription": "Other",
"useOtherDescription": "CMS esMD eMDR",
"contentType": "CSV",
"contentTypeDescription": "CSV",
"address_1": "64 S Price Rd",
"city": "Brownsville",
"state": "TX",
"country_code": "US",
"postal_code": "785212459",
"country_name": "United States",
"address_type": "DOM"
},
{
"endpointType": "DIRECT",
"endpointTypeDescription": "Direct Messaging Address",
"endpoint": "abyczynski456187@direct.myadvocateaurora.org",
"affiliation": "N",
"use": "DIRECT",
"useDescription": "Direct",
"address_1": "945 N 12th St",
"city": "Milwaukee",
"state": "WI",
"country_code": "US",
"postal_code": "532331305",
"country_name": "United States",
"address_type": "DOM"
},
{
"endpointType": "FHIR",
"endpointTypeDescription": "FHIR URL",
"endpoint": "https://EpicFHIR.aurora.org/FHIR/MYAURORA/api/FHIR/DSTU2/",
"affiliation": "N",
"address_1": "945 N 12th St",
"city": "Milwaukee",
"state": "WI",
"country_code": "US",
"postal_code": "532331305",
"country_name": "United States",
"address_type": "DOM"
}
],
"other_names": []
}Other providers in Milwaukee, WI
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 24, 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.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.