William De Wolf, M.D.
NPI 1538274055 · Internal Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William De Wolf, M.D. is a Internal Medicine Physician provider in Oakland, CA (NPI 1538274055).
Provider details
- NPI number
- 1538274055
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G40902 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
484 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 272 | $153 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 104 | $109 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 43 | $156 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 35 | $19 |
| Administration of Influenza Virus VaccineG0008 | 16 | $39 |
| Admn Sarscov2 Vacc 1 Dose |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 62 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 142 | 39 |
| Losartan Potassium | 114 | 32 |
| Levothyroxine Sodium | 90 | 24 |
| Lorazepam | 86 | 17 |
| Gabapentin | 78 | 27 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 74 | 19 |
Practice location
Mailing address
Additional practice locations (1)
- 3100 Telegraph AveOakland, CA 94609-3239Phone: (510) 204-8290
Registry dates
- Enumerated
- 2006-08-21
- Last updated
- 2023-11-21
- Certified
- 2022-07-21
Frequently asked questions
- What is William De Wolf's NPI number?
- William De Wolf's National Provider Identifier (NPI) is 1538274055, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William De Wolf's specialty?
- William De Wolf is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William De Wolf located?
- William De Wolf's practice location on file with NPPES is 350 30th St Ste 100, Oakland, CA 94609-3422.
- What is William De Wolf's phone number?
- The practice phone number listed in the NPPES registry for William De Wolf is (510) 204-8290.
- Does William De Wolf accept Medicare?
- William De Wolf is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William De Wolf's NPI active?
- Yes — William De Wolf's NPI (1538274055) is active in the NPPES registry as of the last update on 2023-11-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.