Quick answers
- Does William F. Deegan Iii accept Medicare assignment?
- Yes. Medicare's clinician data says William F. Deegan Iii 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 William F. Deegan Iii see?
- In 2024, CMS data shows 474 Original Medicare patients and 5,478 services for William F. Deegan Iii. This counts Original Medicare only and measures volume, not quality.
- What is William F. Deegan Iii's NPI number?
- 1982678223. 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 William F. Deegan Iii, 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 | 474 |
|---|---|
| Services billed to Medicare | 5,478 |
| Different services or procedures | 45 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Injection, faricimab-svoa, 0.1 mg (J2777)3,360 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)406 services
- Imaging of retina (92134)346 services
- Photography of the retina (92250)273 services
- 2d ultrasound scan of eye tissue and structures (76512)173 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 pressure70%
- Arthritis42%
- Ischemic heart disease27%
- Diabetes23%
- Chronic kidney disease16%
Hospitals where William F. Deegan Iii works
Medicare's Facility Affiliation Data lists William F. Deegan Iii 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.
- Virginia Hospital CenterArlington, VA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 490050
Practice locations
Addresses where William F. Deegan Iii is enrolled with Medicare (CMS data updated October 2, 2026).
- 1420 Beverly Rd, Suite 110Mc Lean, VA 22101 (703) 643‑9328
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Mc Lean
Clinicians with the same Medicare primary specialty in Mc Lean, VA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tufts University School Of Medicine |
| Graduation year | 1988 (38 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1982678223 |
| 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