Quick answers
- Does David W. Hirshfield accept Medicare assignment?
- Yes. Medicare's clinician data says David W. Hirshfield 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 David W. Hirshfield see?
- In 2024, CMS data shows 89 Original Medicare patients and 314 services for David W. Hirshfield. This counts Original Medicare only and measures volume, not quality.
- What is David W. Hirshfield's NPI number?
- 1538127402. 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 David W. Hirshfield, 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 | 89 |
|---|---|
| Services billed to Medicare | 314 |
| Different services or procedures | 24 |
| 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)89 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)34 services
- Insertion of needle into vein for collection of blood sample (36415)28 services
- Annual alcohol misuse screening, 5 to 15 minutes (G0442)28 services
- Annual, face-to-face intensive behavioral therapy for cardiovascular disease, individual, 15 minutes (G0446)28 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 pressure65%
- High cholesterol64%
- Arthritis38%
- Atrial fibrillation27%
- Ischemic heart disease21%
- Diabetes20%
Hospitals where David W. Hirshfield works
Medicare's Facility Affiliation Data lists David W. Hirshfield 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.
- UC San Diego Health Hillcrest - Hillcrest Medical CenterSan Diego, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050025
Practice locations
Addresses where David W. Hirshfield is enrolled with Medicare (CMS data updated October 2, 2026).
- 9850 Genesee AveLa Jolla, CA 92037 (858) 864‑9800
Group practices
Medicare enrollment lists David W. Hirshfield as a member of this group (CMS data updated October 2, 2026).
- Monica Perlman MD Inc364 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in La Jolla
Clinicians with the same Medicare primary specialty in La Jolla, CA — not a recommendation.
Other clinicians in Monica Perlman MD Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Colorado School Of Medicine, Denver |
| Graduation year | 1994 (32 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1538127402 |
| 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