Quick answers
- Does Erin D. Dunphy accept Medicare assignment?
- Yes. Medicare's clinician data says Erin D. Dunphy 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 Erin D. Dunphy see?
- In 2024, CMS data shows 894 Original Medicare patients and 1,590 services for Erin D. Dunphy. This counts Original Medicare only and measures volume, not quality.
- What is Erin D. Dunphy's NPI number?
- 1639252851. 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 Erin D. Dunphy, 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 | 894 |
|---|---|
| Services billed to Medicare | 1,590 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)439 services
- Imaging of optic nerve (92133)236 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)219 services
- Imaging of retina (92134)186 services
- Established patient complete exam of visual system (92014)135 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 cholesterol73%
- High blood pressure66%
- Arthritis39%
- Diabetes33%
- Anxiety21%
- Ischemic heart disease18%
Hospitals where Erin D. Dunphy works
Medicare's Facility Affiliation Data lists Erin D. Dunphy 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.
- Mercy Health System CorpJanesville, WI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 520066
Practice locations
Addresses where Erin D. Dunphy is enrolled with Medicare (CMS data updated October 2, 2026).
- 1010 N Washington StJanesville, WI 53548 (608) 741‑6799
- 3524 E Milwaukee StJanesville, WI 53546 (608) 756‑7100
Group practices
Medicare enrollment lists Erin D. Dunphy as a member of this group (CMS data updated October 2, 2026).
- Mercy Health System Corporation753 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Janesville
Clinicians with the same Medicare primary specialty in Janesville, WI — not a recommendation.
Other clinicians in Mercy Health System Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Southern College Of Optometry |
| Graduation year | 1997 (29 years since optometry school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639252851 |
| 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