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STEPHEN L BLONSKY MD
NPI 1497855126
Internal Medicine - Nephrology in Muskego, WI

Active since September 23, 2006PECOS Enrolled
S88W12923 UPLAND LN, MUSKEGO, WI 53150(715) 212-1291 Get Directions Write a Review

NPPES record last updated: June 22, 2020. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Stephen L Blonsky Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

STEPHEN L BLONSKY MD (NPI 1497855126) is an individual nephrology provider in Muskego, Wisconsin, licensed in Wisconsin (27560) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1497855126
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameSTEPHEN L BLONSKYCredential: MD
Location AddressS88W12923 UPLAND LNMuskego, WI 53150-7341
Mailing AddressS88w12923 Upland LnMuskego, WI 53150-7341 · (715) 212-1291
Phone(715) 212-1291
Sole ProprietorNo
Enumeration DateSeptember 23, 2006
Last NPPES UpdateJune 22, 2020
NPPES CertifiedJune 22, 2020
✔ NPI 1497855126 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in WI · 27560
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
S88W12923 UPLAND LN, Muskego, WI 53150
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Stephen L Blonsky Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Stephen Blonsky reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mchs Hospitals, Inc.
129 mi
Mental Health (Including Community Mental Health Center)
2450 VINEYARD DR
Plover, WI 54467
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,476 clinicians in this Medicare group
NPI 1386249894 (715) 342-0290
Kidney Care Of Michiana LLC
130 mi
Nephrology
3665 PARK PL W, SUITE 300
Mishawaka, IN 46545
  • Reassigned Medicare billing, Indiana enrollment
  • 10 clinicians in this Medicare group
NPI 1093067530 (574) 607-4724
Marshfield Clinic Inc
160 mi
Clinic/Center
1000 N OAK AVE
Marshfield, WI 54449
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,540 clinicians in this Medicare group
NPI 1952347981 (715) 387-5511

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 2

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
30 services18 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
17 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53150 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$123.69 typical visit price
range $53.90 – $163.24
Typical copayment $30.92 (range $13.47 – $40.81)
Most-billed visit code 99204
Established Patient
$95.41 typical visit price
range $17.40 – $133.76
Typical copayment $23.85 (range $4.35 – $33.44)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Stephen Blonsky's NPI number?

The NPI number for Stephen Blonsky is 1497855126. It was assigned to this individual provider in the NPPES registry on September 23, 2006.

Where is Stephen Blonsky located?

Stephen Blonsky practices at S88w12923 Upland Ln, Muskego, WI 53150. The listed phone number is (715) 212-1291.

What is Stephen Blonsky's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Stephen Blonsky enrolled in Medicare?

Yes. Stephen Blonsky is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Stephen Blonsky's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Blonsky reassigns Medicare benefits to 3 organizations: Mchs Hospitals, Inc. (Plover, WI), Kidney Care Of Michiana LLC (Mishawaka, IN) and Marshfield Clinic Inc (Marshfield, WI). 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 Stephen Blonsky's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Stephen Blonsky accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan and Ambetter from Meridian list Stephen Blonsky 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.

When was this NPI record last updated?

The NPPES record for Stephen Blonsky was last updated on June 22, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.