Quick answers
- Does Jeffrey R. Unger accept Medicare assignment?
- Medicare's clinician data says Jeffrey R. Unger may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Jeffrey R. Unger see?
- In 2024, CMS data shows 69 Original Medicare patients and 1,025 services for Jeffrey R. Unger. This counts Original Medicare only and measures volume, not quality.
- What is Jeffrey R. Unger's NPI number?
- 1003856188. 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 Jeffrey R. Unger, 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 | 69 |
|---|---|
| Services billed to Medicare | 1,025 |
| Different services or procedures | 43 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)254 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)164 services
- Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report (95251)90 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)73 services
- Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)63 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%
- Diabetes72%
- Chronic kidney disease64%
- Arthritis32%
- Ischemic heart disease28%
Practice locations
Addresses where Jeffrey R. Unger is enrolled with Medicare (CMS data updated October 2, 2026).
- 9220 Haven Ave, Suite 230Rancho Cucamonga, CA 91730 (909) 484‑2105
Specialties
- Internal Medicineprimary
- Family Practicealso
Other internal medicine doctors in Rancho Cucamonga
Clinicians with the same Medicare primary specialty in Rancho Cucamonga, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Northwestern University Feinberg Medical School |
| Graduation year | 1980 (46 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1003856188 |
| 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