William Mackin, M.D.
NPI 1215924949 · Cardiovascular Disease Physician · Geneva, IL
Enrolled with Medicare as Practitioner - Interventional Cardiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Mackin, M.D. is a Cardiovascular Disease Physician provider in Geneva, IL (NPI 1215924949).
Provider details
- NPI number
- 1215924949
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 4301053298 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
5 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
681 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 232 | $8 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 219 | $135 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 69 | $82 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 50 | $15 |
| Use of a Drug to Induce Depression of Consciousness By Physician Performing a Procedure (5 Years Or Older), Initial 15 Minutes99152 | 35 | $13 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 360 | 112 |
| Atorvastatin Calcium | 331 | 102 |
| Amlodipine Besylate | 276 | 85 |
| Rosuvastatin Calcium | 210 | 61 |
| Lisinopril | 203 | 62 |
| Apixabanbrand: Eliquis | 198 | 56 |
Practice location
Mailing address
Additional practice locations (4)
- 25 N Winfield RdWinfield, IL 60190-1295Phone: (630) 232-0280Fax: (630) 232-3895
- 31 N Saint Joseph AveNiles, MI 49120-2207Phone: (269) 684-6777
- 3950 Hollywood Rd Ste 110Saint Joseph, MI 49085-9151Phone: (269) 983-3595
- 500 W Broadway St Ste 320Missoula, MT 59802-4003Phone: (406) 329-5615Fax: (406) 329-5606
Registry dates
- Enumerated
- 2005-09-27
- Last updated
- 2025-04-20
- Certified
- 2025-04-20
Frequently asked questions
- What is William Mackin's NPI number?
- William Mackin's National Provider Identifier (NPI) is 1215924949, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mackin's specialty?
- William Mackin is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is William Mackin located?
- William Mackin's practice location on file with NPPES is 351 Delnor Dr, Geneva, IL 60134-4220.
- What is William Mackin's phone number?
- The practice phone number listed in the NPPES registry for William Mackin is (630) 232-0280.
- Does William Mackin accept Medicare?
- William Mackin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Mackin's NPI active?
- Yes — William Mackin's NPI (1215924949) is active in the NPPES registry as of the last update on 2025-04-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.