Quick answers
- Does Jeffrey T. Bortz accept Medicare assignment?
- Yes. Medicare's clinician data says Jeffrey T. Bortz 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 Jeffrey T. Bortz see?
- In 2024, CMS data shows 374 Original Medicare patients and 1,798 services for Jeffrey T. Bortz. This counts Original Medicare only and measures volume, not quality.
- What is Jeffrey T. Bortz's NPI number?
- 1710191382. 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 T. Bortz, 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 | 374 |
|---|---|
| Services billed to Medicare | 1,798 |
| Different services or procedures | 85 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks (17311)324 services
- Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocks (17312)310 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)87 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)73 services
- Complicated repair of wound of forehead, cheeks, chin, mouth, neck, underarms, genitals, hands, or feet, 2.6-7.5 cm (13132)62 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 pressure68%
- Arthritis38%
- Ischemic heart disease25%
- Atrial fibrillation24%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)21%
Practice locations
Addresses where Jeffrey T. Bortz is enrolled with Medicare (CMS data updated October 2, 2026).
- 355 Lennon Ln, Suite 255Walnut Creek, CA 94598 (925) 932‑7704
Group practices
Medicare enrollment lists Jeffrey T. Bortz as a member of this group (CMS data updated October 2, 2026).
- Golden State Dermatology Associates, Inc.125 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in Walnut Creek
Clinicians with the same Medicare primary specialty in Walnut Creek, CA — not a recommendation.
Other clinicians in Golden State Dermatology Associates, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Iowa, Rj & L Carver College Of Medicine |
| Graduation year | 1989 (37 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1710191382 |
| 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