William Josephson, MD
NPI 1376647651 · Internal Medicine Physician · Northridge, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Josephson, MD is a Internal Medicine Physician provider in Northridge, CA (NPI 1376647651).
Provider details
- NPI number
- 1376647651
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A44225 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,440 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 957 | $142 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 330 | $126 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 291 | $101 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 127 | $81 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 93 | $123 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 191 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 626 | 105 |
| Levothyroxine Sodium | 537 | 86 |
| Metformin Hcl | 430 | 82 |
| Amlodipine Besylate | 342 | 62 |
| Losartan Potassium | 339 | 70 |
| Pantoprazole Sodium | 240 | 54 |
| Gabapentin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,295 across 46 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-08
- Last updated
- 2014-01-06
Frequently asked questions
- What is William Josephson's NPI number?
- William Josephson's National Provider Identifier (NPI) is 1376647651, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Josephson's specialty?
- William Josephson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Josephson located?
- William Josephson's practice location on file with NPPES is 17075 Devonshire, Northridge, CA 91325.
- What is William Josephson's phone number?
- The practice phone number listed in the NPPES registry for William Josephson is (818) 831-7767.
- Does William Josephson accept Medicare?
- William Josephson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Josephson's NPI active?
- Yes — William Josephson's NPI (1376647651) is active in the NPPES registry as of the last update on 2014-01-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.