Kenneth Hassler, DO
NPI 1659783348 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Ann Arbor, MI
Enrolled with Medicare as Practitioner - Thoracic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kenneth Hassler, DO is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider in Ann Arbor, MI (NPI 1659783348).
Provider details
- NPI number
- 1659783348
- Entity type
- Individual
- Primary specialty
- Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 66795 (MN)
Specialties & taxonomies
- Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianPrimary208G00000XLicense 5101027406 (MI)
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 tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
25 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) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 14 | $174 |
| Replacement of Aortic Valve Through the Skin and Femoral Artery33361 | 11 | $772 |
Typical Medicare-allowed amounts for these services range $174–$772 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$10,712 across 43 records (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 (3)
- 2601 E Roosevelt StPhoenix, AZ 85008-4973Phone: (602) 344-5445
- 24 Hospital AveDanbury, CT 06810-6099Phone: (203) 739-7000
- 200 1st St SwRochester, MN 55905-0001Phone: (507) 284-2511
Registry dates
- Enumerated
- 2014-05-29
- Last updated
- 2024-04-23
- Certified
- 2024-04-23
Frequently asked questions
- What is Kenneth Hassler's NPI number?
- Kenneth Hassler's National Provider Identifier (NPI) is 1659783348, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kenneth Hassler's specialty?
- Kenneth Hassler is listed in the NPPES registry with a primary specialty of Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (Allopathic & Osteopathic Physicians).
- Where is Kenneth Hassler located?
- Kenneth Hassler's practice location on file with NPPES is 1500 E Medical Center Dr, Ann Arbor, MI 48109-5000.
- What is Kenneth Hassler's phone number?
- The practice phone number listed in the NPPES registry for Kenneth Hassler is (734) 936-4000.
- Does Kenneth Hassler accept Medicare?
- Kenneth Hassler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kenneth Hassler's NPI active?
- Yes — Kenneth Hassler's NPI (1659783348) is active in the NPPES registry as of the last update on 2024-04-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.