Quick answers
- Does John P. Grundy Iii accept Medicare assignment?
- Yes. Medicare's clinician data says John P. Grundy 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 John P. Grundy Iii see?
- In 2024, CMS data shows 1,195 Original Medicare patients and 4,340 services for John P. Grundy Iii. This counts Original Medicare only and measures volume, not quality.
- What is John P. Grundy Iii's NPI number?
- 1194775932. 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 John P. Grundy 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 | 1,195 |
|---|---|
| Services billed to Medicare | 4,340 |
| Different services or procedures | 38 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,397 services
- Imaging of optic nerve (92133)810 services
- Imaging of retina (92134)363 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)253 services
- Ultrasound scan of cornea to determine thickness (76514)231 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 cholesterol75%
- Diabetes43%
- Arthritis40%
- Chronic kidney disease23%
- Ischemic heart disease22%
Practice locations
Addresses where John P. Grundy Iii is enrolled with Medicare (CMS data updated October 2, 2026).
- 6011 University Blvd, Suite 190Ellicott City, MD 21043 (301) 725‑3010
- 615 Main StLaurel, MD 20707 (301) 725‑3010
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Maryland
Clinicians with the same Medicare primary specialty in Maryland — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York At Stony Brook, School Of Medicine |
| Graduation year | 1993 (33 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1194775932 |
| 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