Quick answers
- Does Dennis W. Hartman accept Medicare assignment?
- Yes. Medicare's clinician data says Dennis W. Hartman 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 Dennis W. Hartman see?
- In 2024, CMS data shows 1,175 Original Medicare patients and 2,986 services for Dennis W. Hartman. This counts Original Medicare only and measures volume, not quality.
- What is Dennis W. Hartman's NPI number?
- 1922078294. 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 Dennis W. Hartman, 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 | 1,175 |
|---|---|
| Services billed to Medicare | 2,986 |
| Different services or procedures | 30 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient complete exam of visual system (92014)890 services
- Photography of the retina (92250)590 services
- Established patient problem focused exam of visual system (92012)572 services
- Imaging of retina (92134)299 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)240 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%
- Diabetes49%
- Arthritis38%
- Ischemic heart disease27%
- Chronic kidney disease27%
Practice locations
Addresses where Dennis W. Hartman is enrolled with Medicare (CMS data updated October 2, 2026).
- 580 Collins DrMerced, CA 95348 (209) 383‑0989
Group practices
Medicare enrollment lists Dennis W. Hartman as a member of this group (CMS data updated October 2, 2026).
- Kenneth R Grossman M D Inc2 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Merced
Clinicians with the same Medicare primary specialty in Merced, CA — not a recommendation.
Other clinicians in Kenneth R Grossman M D Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Pacific University - College Of Optometry |
| Graduation year | 1989 (37 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922078294 |
| 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