David Horwitz, PAC
NPI 1386739845 · Medical Physician Assistant · Arcata, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Horwitz, PAC is a Medical Physician Assistant provider in Arcata, CA (NPI 1386739845).
Provider details
- NPI number
- 1386739845
- Entity type
- Individual
- Primary specialty
- Medical Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PAC
- Sex
- Male
- Sole proprietor
- No
- License
- PA10646 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
143 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Hemoglobin A1c Level83036 | 63 | $10 |
| Urinalysis Using Microscope81015 | 46 | $3 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Tracing93005 | 19 | $7 |
| Testing for Presence of Drug, Read By Direct Observation80305 | 15 | $12 |
Typical Medicare-allowed amounts for these services range $3–$12 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 82 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 219 | 47 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 158 | 27 |
| Levothyroxine Sodium | 113 | 23 |
| Gabapentin | 98 | 19 |
| Amlodipine Besylate | 78 | 25 |
| Lisinopril | 68 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-03
- Last updated
- 2024-10-01
- Certified
- 2024-10-01
Frequently asked questions
- What is David Horwitz's NPI number?
- David Horwitz's National Provider Identifier (NPI) is 1386739845, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Horwitz's specialty?
- David Horwitz is listed in the NPPES registry with a primary specialty of Medical Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is David Horwitz located?
- David Horwitz's practice location on file with NPPES is 1150 Foster Ave, Arcata, CA 95521-5986.
- What is David Horwitz's phone number?
- The practice phone number listed in the NPPES registry for David Horwitz is (707) 826-8610.
- Does David Horwitz accept Medicare?
- David Horwitz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Horwitz's NPI active?
- Yes — David Horwitz's NPI (1386739845) is active in the NPPES registry as of the last update on 2024-10-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.