Quick answers
- Does Merle L. Diamond accept Medicare assignment?
- Yes. Medicare's clinician data says Merle L. Diamond 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 Merle L. Diamond see?
- In 2024, CMS data shows 438 Original Medicare patients and 30,660 services for Merle L. Diamond. This counts Original Medicare only and measures volume, not quality.
- What is Merle L. Diamond's NPI number?
- 1780676668. 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 Merle L. Diamond, 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 | 438 |
|---|---|
| Services billed to Medicare | 30,660 |
| Different services or procedures | 37 |
| Participating Medicare provider | Yes |
| Average age of these patients | 65 |
Most frequent services
- Injection, onabotulinumtoxina, 1 unit (J0585)27,712 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)835 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)465 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)445 services
- 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's (G2211)376 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 cholesterol68%
- Arthritis58%
- High blood pressure56%
- Depression46%
- Anxiety46%
- Osteoporosis20%
Hospitals where Merle L. Diamond works
Medicare's Facility Affiliation Data lists Merle L. Diamond 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
- Presence Saint Joseph Hospital - ChicagoChicago, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140224
Practice locations
Addresses where Merle L. Diamond is enrolled with Medicare (CMS data updated October 2, 2026).
- 1460 N Halsted St, Suite 501Chicago, IL 60642 (847) 618‑3590
- 2150 Pfingsten RdGlenview, IL 60026
- 2650 Ridge AveEvanston, IL 60201
- 800 W Central RdArlington Heights, IL 60005 (847) 618‑1000
Group practices
Medicare enrollment lists Merle L. Diamond as a member of this group (CMS data updated October 2, 2026).
- Endeavor Health Medical Group3,350 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Other clinicians in Endeavor Health Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Northwestern University Feinberg Medical School |
| Graduation year | 1980 (46 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1780676668 |
| 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