Quick answers
- Does Michael J. Keenan accept Medicare assignment?
- Yes. Medicare's clinician data says Michael J. Keenan 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 J. Keenan see?
- In 2024, CMS data shows 231 Original Medicare patients and 1,501 services for Michael J. Keenan. This counts Original Medicare only and measures volume, not quality.
- What is Michael J. Keenan's NPI number?
- 1558332197. 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 J. Keenan, 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 | 231 |
|---|---|
| Services billed to Medicare | 1,501 |
| Different services or procedures | 31 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Professional service for preparation and provision of 1 or more antigens (95165)439 services
- Test for allergy using allergenic extract injected into skin (95024)219 services
- Professional service for multiple injections of allergen (95117)113 services
- Removal of impacted ear wax (69210)88 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)74 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 cholesterol67%
- High blood pressure66%
- Arthritis47%
- Anxiety25%
- Depression24%
- Diabetes20%
Hospitals where Michael J. Keenan works
Medicare's Facility Affiliation Data lists Michael J. Keenan 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.
- Spectrum HealthGrand Rapids, MI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 230038
Practice locations
Addresses where Michael J. Keenan is enrolled with Medicare (CMS data updated October 2, 2026).
- 17168 Timber View DrGrand Haven, MI 49417 (616) 414‑3088
- 3100 N Wellness DrHolland, MI 49424 (616) 994‑2770
Group practices
Medicare enrollment lists Michael J. Keenan as a member of this group (CMS data updated October 2, 2026).
- Michigan Ear Nose Throat and Allergy Specialists PC43 clinicians in the group
Specialties
- Otolaryngologyprimary
Other ENT doctors in Grand Haven
Clinicians with the same Medicare primary specialty in Grand Haven, MI — not a recommendation.
Other clinicians in Michigan Ear Nose Throat and Allergy Specialists PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Saint Louis University School Of Medicine |
| Graduation year | 1991 (35 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1558332197 |
| 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