JOSEPH Y AHN MD
NPI 1487789863
Emergency Medicine in Round Lake, IL
About Joseph Y Ahn Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOSEPH Y AHN MD (NPI 1487789863) is an individual emergency medicine provider in Round Lake, Illinois, licensed in Delaware (C70003552) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, is affiliated with South Texas Health System, and is a graduate of University Of Michigan Medical School (2006).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Joseph Y Ahn Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
12Medicare enrollment records show Joseph Ahn reassigns Medicare billing to 12 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Park Ridge, IL 60068
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 clinicians in this Medicare group
Manitowoc, WI 54220
- Reassigned Medicare billing, Wisconsin enrollment
- 350 clinicians in this Medicare group
Marinette, WI 54143
- Reassigned Medicare billing, Wisconsin enrollment
- 59 clinicians in this Medicare group
Black River Falls, WI 54615
- Reassigned Medicare billing, Wisconsin enrollment
- 227 clinicians in this Medicare group
Austin, TX 78705
- Reassigned Medicare billing, Texas enrollment
- 1,511 clinicians in this Medicare group
San Antonio, TX 78229
- Reassigned Medicare billing, Texas enrollment
- 1,452 clinicians in this Medicare group
Harlingen, TX 78550
- Reassigned Medicare billing, Texas enrollment
- 47 clinicians in this Medicare group
Edinburg, TX 78541
- Reassigned Medicare billing, Texas enrollment
- 154 clinicians in this Medicare group
Edinburg, TX 78539
- Reassigned Medicare billing, Texas enrollment
- 257 clinicians in this Medicare group
Edinburg, TX 78539
- Reassigned Medicare billing, Texas enrollment
- 59 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
South Texas Health System
Acute Care Hospitals · Edinburg, TXKnapp Medical Center
Acute Care Hospitals · Weslaco, TXValley Regional Medical Center
Acute Care Hospitals · Brownsville, TXHarlingen Medical Center
Acute Care Hospitals · Harlingen, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60073 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Joseph Ahn's NPI number?
The NPI number for Joseph Ahn is 1487789863. It was assigned to this individual provider in the NPPES registry on February 23, 2007.
Where is Joseph Ahn located?
Joseph Ahn practices at 308 W Biros Ln, Round Lake, IL 60073. The listed phone number is (734) 846-1733.
What is Joseph Ahn's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Joseph Ahn enrolled in Medicare?
Yes. Joseph Ahn is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Joseph Ahn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Joseph Ahn reassigns Medicare benefits to 12 organizations: Lutheran General Hospital (Park Ridge, IL), Froedtert Manitowoc Medical Group, LLC (Manitowoc, WI), Emergency Physician Associates Of Wisconsin Sc (Marinette, WI), Black River Health Inc (Black River Falls, WI), Travis County Emergency Physicians PA (Austin, TX) and 7 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Joseph Ahn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Joseph Ahn accept?
Health plans from Blue Cross and Blue Shield of Texas, CHRISTUS Health Plan, Imperial Insurance Companies, Inc., Oscar Insurance Company and UnitedHealthcare list Joseph Ahn as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Joseph Ahn affiliated with any hospitals?
According to CMS data, Joseph Ahn is affiliated with South Texas Health System, Knapp Medical Center, Valley Regional Medical Center and Harlingen Medical Center.
When was this NPI record last updated?
The NPPES record for Joseph Ahn was last updated on September 24, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Joseph Y Ahn, MD · NPI 1487789863
Emergency Medicine physician in Round Lake, Illinois. Individual provider, active in the CMS NPPES registry since February 23, 2007.
## Identity
- **NPI:** 1487789863 (Entity type: Individual)
- **Enumerated:** February 23, 2007
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** C70003552 (Delaware)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 308 W BIROS LN, Round Lake, IL 60073-5607
- **Phone:** (734) 846-1733
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 12 organizations under Medicare reassignment (form CMS-855R): Lutheran General Hospital (NPI 1801809306, Park Ridge, IL); Froedtert Manitowoc Medical Group, LLC (NPI 1437829975, Manitowoc, WI); Emergency Physician Associates Of Wisconsin Sc (NPI 1396119426, Marinette, WI); Black River Health Inc (NPI 1003914011, Black River Falls, WI); Travis County Emergency Physicians PA (NPI 1962440933, Austin, TX); and 7 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Michigan Medical School, class of 2006
## Record status
- **NPPES last updated:** September 24, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1487789863) · Data from the CMS NPPES public registry.