Quick answers
- Does Johnny L. Isenberger accept Medicare assignment?
- Yes. Medicare's clinician data says Johnny L. Isenberger 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 Johnny L. Isenberger see?
- In 2024, CMS data shows 30 Original Medicare patients and 48 services for Johnny L. Isenberger. This counts Original Medicare only and measures volume, not quality.
- What is Johnny L. Isenberger's NPI number?
- 1497987028. 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 Johnny L. Isenberger, 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 | 30 |
|---|---|
| Services billed to Medicare | 48 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Critical care, first 30-74 minutes (99291)19 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 blood pressure75%
- High cholesterol67%
- Arthritis47%
- COPD47%
- Anxiety43%
- Atrial fibrillation43%
Hospitals where Johnny L. Isenberger works
Medicare's Facility Affiliation Data lists Johnny L. Isenberger 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.
- UMass Memorial Healthalliance HospitalsLeominster, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220001
- UMass Memorial Medical Center/University CampusWorcester, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220163
Practice locations
Addresses where Johnny L. Isenberger is enrolled with Medicare (CMS data updated October 2, 2026).
- 119 Belmont StWorcester, MA 01605
- 55 Lake Ave NWorcester, MA 01655 (508) 334‑1000
Group practices
Medicare enrollment lists Johnny L. Isenberger as a member of this group (CMS data updated October 2, 2026).
- UMass Memorial Medical Group Inc2,516 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Worcester
Clinicians with the same Medicare primary specialty in Worcester, MA — not a recommendation.
Other clinicians in UMass Memorial Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2009 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1497987028 |
| 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