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DR. WILLIAM J MACKIN M.D.
NPI 1215924949
Internal Medicine - Cardiovascular Disease in Geneva, IL

Active since September 27, 2005PECOS EnrolledAccepts Medicare Assignment
94.1/100
CMS Quality Rating
351 DELNOR DR, SUITE 100, GENEVA, IL 60134(630) 232-0280(630) 232-3895 Get Directions Write a Review

NPPES record last updated: April 20, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 2, 2025, Mar 17, 2018, Feb 19, 2018 and 1 more (4 updates tracked since 2018).

About Dr. William J Mackin M.d. NPPES

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

DR. WILLIAM J MACKIN M.D. (NPI 1215924949) is an individual cardiovascular disease provider in Geneva, Illinois, licensed in Illinois (036077645) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS, is affiliated with The Medical Center (bowling Green), and maintains 4 additional practice locations.

NPPES Registry Identity

NPI1215924949
Entity TypeIndividualMale
Primary Taxonomy207RC0000X
Provider Legal NameDR. WILLIAM J MACKINCredential: M.D.
Location Address351 DELNOR DR, SUITE 100Geneva, IL 60134-4220
Mailing Address351 Delnor Dr, Suite 100Geneva, IL 60134-4220 · (630) 232-0280 · Fax (630) 232-3895
Phone(630) 232-0280
Fax(630) 232-3895
Sole ProprietorNo
Medical School CMSTemple University School Of MedicineGraduated 1982
Enumeration DateSeptember 27, 2005
Last NPPES UpdateApril 20, 20254 updates tracked since enumeration
NPPES CertifiedApril 20, 2025
✔ NPI 1215924949 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RC0000X
Licenses✔ Licensed in IL · 036077645✔ Licensed in MI · 4301053298✔ Licensed in MT · MED-PHYS-COM-143864
Definition
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
Also ListedInternal Medicine · Interventional CardiologyTaxonomy 207RI0011X · License 036077645 (IL), 4761-320 (WI)
351 DELNOR DR, Geneva, IL 60134
Open in Google Maps ↗

Secondary Practice Locations 4

Location 125 N Winfield rdWinfield, IL 60190-1295 · Phone (630) 232-0280 · Fax (630) 232-3895
Location 23950 Hollywood Rd Ste 110Saint Joseph, MI 49085-9151 · Phone (269) 983-3595
Location 331 N Saint Joseph AveNiles, MI 49120-2207 · Phone (269) 684-6777
Location 4500 W Broadway St Ste 320Missoula, MT 59802-4003 · Phone (406) 329-5615 · Fax (406) 329-5606

Other Identifiers 4

Medicaid100298082WI
Other206147058IL · Medicare Ptan (individual)
Other206147IL · Medicare Ptan (group)
Medicaid036077645IL

Accepted Insurance

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

Dr. William J Mackin M.d. 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.

PECOS PAC ID4688577679
PECOS Enrollment IDI20250424001437
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

8

Medicare enrollment records show William Mackin reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Delnor Community Hospital
1.8 mi
General Acute Care Hospital
300 RANDALL RD
Geneva, IL 60134
  • Reassigned Medicare billing, Illinois enrollment
  • 35 clinicians in this Medicare group
NPI 1407859655 (630) 208-3000
Central Dupage Hospital Association
7.6 mi
General Acute Care Hospital
25 NORTH WINFIELD RD.
Winfield, IL 60190
  • Reassigned Medicare billing, Illinois enrollment
  • 129 clinicians in this Medicare group
NPI 1003864810 (630) 933-1600
Aurora Medical Group, Inc.
78 mi
Obstetrics & Gynecology
8905 W LINCOLN AVE, SUITE 515
West Allis, WI 53227
  • Reassigned Medicare billing, Wisconsin enrollment
  • 4,609 clinicians in this Medicare group
NPI 1457592735 (414) 328-8650
Lakeland Medical Practices
90 mi
Internal Medicine
9623 RED ARROW HWY
Bridgman, MI 49106
  • Reassigned Medicare billing, Michigan enrollment
  • 724 clinicians in this Medicare group
NPI 1568232247 (269) 465-6050
Lakeland Hospitals At Niles And St Joseph, Inc
95 mi
General Acute Care Hospital
1234 NAPIER AVE
Saint Joseph, MI 49085
  • Reassigned Medicare billing, Michigan enrollment
  • 249 clinicians in this Medicare group
NPI 1134220031 (269) 983-8300
Lakeland Community Hospital Watervliet
105 mi
Rural Health
6701 PAW PAW AVE
Coloma, MI 49038
  • Reassigned Medicare billing, Michigan enrollment
  • 107 clinicians in this Medicare group
NPI 1083710701 (269) 468-6430
Providence Health & Services Mt
1,191 mi
Cardiovascular Disease
1417 9TH ST S, SUITE 203
Great Falls, MT 59405
  • Reassigned Medicare billing, Montana enrollment
  • 325 clinicians in this Medicare group
NPI 1679730436 (406) 771-7700
Rchp Billings - Missoula LLC
1,314 mi
Family Medicine
2827 FORT MISSOULA RD
Missoula, MT 59804
  • Reassigned Medicare billing, Montana enrollment
  • 192 clinicians in this Medicare group
NPI 1376946913 (406) 327-4620

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 9

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.

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
232 services191 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
219 services200 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.
69 services44 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000
An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.
50 services50 patients
Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes 99152
This procedure involves a doctor administering a medication to reduce your consciousness during a procedure. This helps in managing discomfort and anxiety. The initial application lasts for 15 minutes and is for individuals aged 5 years or older.
35 services34 patients
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306
This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.
26 services26 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

The Medical Center (bowling Green)

Acute Care Hospitals · Bowling Green, KY
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number180013
Location250 Park StreetBowling Green, KY 42101 · Warren County
Emergency services Birthing friendly

Tristar Greenview Regional Hospital

Acute Care Hospitals · Bowling Green, KY
3/5 CMS rating
OwnershipProprietary
CMS Certification Number180124
Location1801 Ashley CircleBowling Green, KY 42104 · Warren County
Emergency services

Lakeland Hospital, St Joseph

Acute Care Hospitals · St Joseph, MI
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number230021
Location1234 Napier AvenueSt Joseph, MI 49085 · Berrien County
Emergency services Birthing friendly

Cheyenne Regional Medical Center

Acute Care Hospitals · Cheyenne, WY
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number530014
Location214 East 23rd StreetCheyenne, WY 82001 · Laramie County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60134 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
$137.43 typical visit price
range $59.81 – $181.38
Typical copayment $34.35 (range $14.95 – $45.34)
Most-billed visit code 99204
Established Patient
$74.38 typical visit price
range $19.15 – $147.12
Typical copayment $18.59 (range $4.78 – $36.78)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

94.1/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality82.59
Promoting Interoperability100
Improvement Activities40

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MIRIAM HAUTH RN
Registered Nurse
351 DELNOR DR
GENEVA, IL 60134
Kane County (630) 938-8767
DR. NAUMAN MUSHTAQ M.D.
Internal Medicine (Interventional Cardiology)
351 DELNOR DR
GENEVA, IL 60134
Kane County (630) 232-0280
MRS. CARMEN HAMPSON NP
Nurse Practitioner
351 DELNOR DR, SUITE 300
GENEVA, IL 60134
Kane County (630) 262-1001
NICHOLAS FURIASSE M.D.
Internal Medicine (Cardiovascular Disease)
351 DELNOR DR
GENEVA, IL 60134
Kane County (630) 232-0280
DR. DEBORAH L HAY M.D.
Obstetrics & Gynecology
351 DELNOR DR
GENEVA, IL 60134
Kane County (630) 208-0784
CHRISTOPHER MICHAEL GEORGE M.D.
Internal Medicine (Hematology & Oncology)
351 DELNOR DR
GENEVA, IL 60134
Kane County (630) 232-0610
VAN ORTHOPAEDIC & SPINE SURGERY SC
Orthopaedic Surgery
351 DELNOR DR, SUITE 406
GENEVA, IL 60134
Kane County (630) 208-3099
DR. KURT J WILLIAMS M.D.
Internal Medicine (Cardiovascular Disease)
351 DELNOR DR, SUITE 100
GENEVA, IL 60134
Kane County (630) 232-0280

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 William Mackin's NPI number?

The NPI number for William Mackin is 1215924949. It was assigned to this individual provider in the NPPES registry on September 27, 2005.

Where is William Mackin located?

William Mackin practices at 351 Delnor Dr Suite 100, Geneva, IL 60134. The listed phone number is (630) 232-0280.

What is William Mackin's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Is William Mackin enrolled in Medicare?

Yes. William Mackin 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 William Mackin's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Mackin reassigns Medicare benefits to 8 organizations: Delnor Community Hospital (Geneva, IL), Central Dupage Hospital Association (Winfield, IL), Aurora Medical Group, Inc. (West Allis, WI), Lakeland Medical Practices (Bridgman, MI), Lakeland Hospitals At Niles And St Joseph, Inc (Saint Joseph, MI) and 3 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 William Mackin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Mackin accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter of Tennessee, Anthem Blue Cross and Blue Shield and Aspirus Health Plan and 6 other insurers list William Mackin 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 William Mackin affiliated with any hospitals?

According to CMS data, William Mackin is affiliated with The Medical Center (bowling Green), Tristar Greenview Regional Hospital, Lakeland Hospital, St Joseph and Cheyenne Regional Medical Center.

When was this NPI record last updated?

The NPPES record for William Mackin was last updated on April 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months 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.