Quick answers
- Does Michael H. Fretzin accept Medicare assignment?
- Yes. Medicare's clinician data says Michael H. Fretzin accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Michael H. Fretzin see?
- In 2024, CMS data shows 1,759 Original Medicare patients and 12,080 services for Michael H. Fretzin. This counts Original Medicare only and measures volume, not quality.
- What is Michael H. Fretzin's NPI number?
- 1134118987. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Michael H. Fretzin, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 1,759 |
|---|---|
| Services billed to Medicare | 12,080 |
| Different services or procedures | 86 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Destruction of precancer skin growth, 2-14 growths (17003)3,238 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)1,447 services
- Pathology examination of tissue using a microscope, intermediate complexity (88305)932 services
- Destruction of precancer skin growth, 1 growth (17000)842 services
- Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)554 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure66%
- Arthritis45%
- Ischemic heart disease26%
- Diabetes20%
- Chronic kidney disease18%
Hospitals where Michael H. Fretzin works
Medicare's Facility Affiliation Data lists Michael H. Fretzin at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Northwest Community Hospital 1Arlington Heights, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140252
Practice locations
Addresses where Michael H. Fretzin is enrolled with Medicare (CMS data updated October 2, 2026).
- 600 W Lake Cook Rd, Suite 110Buffalo Grove, IL 60089 (847) 459‑6611
- 767 Park Ave W, Suite 310Highland Park, IL 60035 (847) 432‑4650
Group practices
Medicare enrollment lists Michael H. Fretzin as a member of this group (CMS data updated October 2, 2026).
- Scott D Glazer MD SC6 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in Buffalo Grove
Clinicians with the same Medicare primary specialty in Buffalo Grove, IL — not a recommendation.
Other clinicians in Scott D Glazer MD SC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1996 (30 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134118987 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians