Michael Fassl, MD
NPI 1477173664 · Family Medicine Physician · Merrionette Park, IL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Fassl, MD is a Family Medicine Physician provider in Merrionette Park, IL (NPI 1477173664).
Provider details
- NPI number
- 1477173664
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
6 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
722 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 195 | $129 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 135 | $17 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 81 | $9 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 68 | $132 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 64 | $19 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 71 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 210 | 87 |
| Amlodipine Besylate | 150 | 66 |
| Lisinopril | 103 | 45 |
| Metformin Hcl | 98 | 40 |
| Furosemide | 91 | 40 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 78 | 32 |
| Metoprolol Succinate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$21 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 617 W Clairemont AveEau Claire, WI 54701-6223Phone: (715) 839-5175
Registry dates
- Enumerated
- 2020-04-17
- Last updated
- 2023-10-11
- Certified
- 2023-10-11
Frequently asked questions
- What is Michael Fassl's NPI number?
- Michael Fassl's National Provider Identifier (NPI) is 1477173664, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Fassl's specialty?
- Michael Fassl is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Fassl located?
- Michael Fassl's practice location on file with NPPES is 11600 S Kedzie Ave, Merrionette Park, IL 60803-6307.
- What is Michael Fassl's phone number?
- The practice phone number listed in the NPPES registry for Michael Fassl is (708) 272-4150.
- Does Michael Fassl accept Medicare?
- Michael Fassl is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Fassl's NPI active?
- Yes — Michael Fassl's NPI (1477173664) is active in the NPPES registry as of the last update on 2023-10-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.