Quick answers
- Does Charlotte F. Nielsen accept Medicare assignment?
- Yes. Medicare's clinician data says Charlotte F. Nielsen 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 Charlotte F. Nielsen see?
- In 2024, CMS data shows 154 Original Medicare patients and 722 services for Charlotte F. Nielsen. This counts Original Medicare only and measures volume, not quality.
- What is Charlotte F. Nielsen's NPI number?
- 1962492975. 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 Charlotte F. Nielsen, 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 | 154 |
|---|---|
| Services billed to Medicare | 722 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Imaging of retina (92134)138 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)115 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)28 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)13 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 pressure72%
- Arthritis45%
- Diabetes26%
- Chronic kidney disease21%
- Ischemic heart disease19%
Practice locations
Addresses where Charlotte F. Nielsen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1120 E Washington StGrayslake, IL 60030 (847) 223‑2000
Group practices
Medicare enrollment lists Charlotte F. Nielsen as a member of this group (CMS data updated October 2, 2026).
- Dr Charlotte F Nielsen PC2 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Grayslake
Clinicians with the same Medicare primary specialty in Grayslake, IL — not a recommendation.
Other clinicians in Dr Charlotte F Nielsen PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Illinois College Of Optometry At Chicago |
| Graduation year | 1992 (34 years since optometry school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962492975 |
| 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
- 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