Arthur Williams, MD
NPI 1578524617 · Anatomic Pathology & Clinical Pathology Physician · San Gabriel, CA
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Arthur Williams, MD is a Anatomic Pathology & Clinical Pathology Physician provider in San Gabriel, CA (NPI 1578524617).
Provider details
- NPI number
- 1578524617
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G21327 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 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
2,315 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) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 705 | $38 |
| Special Stained Specimen Slides to Examine Tissue Including Interpretation and Report88313 | 565 | $12 |
| Special Stained Specimen Slides to Identify Organisms Including Interpretation and Report88312 | 465 | $27 |
| Special Stained Specimen Slides to Examine Tissue, Each Additional Procedure88341 | 201 | $29 |
| Special Stained Specimen Slides to Examine Tissue, Initial Procedure88342 | 83 | $36 |
| Pathology Examination of Tissue Using a Microscope, Moderately Low Complexity88304 | 63 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Celecoxib | 14 |
| Ipratropium Bromide | 13 |
| Alirocumabbrand: Praluent Pen | 12 |
| Tamsulosin Hcl | 12 |
| Levothyroxine Sodium | 11 |
| Trazodone Hcl | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-29
- Last updated
- 2009-11-16
Frequently asked questions
- What is Arthur Williams's NPI number?
- Arthur Williams's National Provider Identifier (NPI) is 1578524617, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Arthur Williams's specialty?
- Arthur Williams is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Arthur Williams located?
- Arthur Williams's practice location on file with NPPES is 438 W Las Tunas Dr, San Gabriel, CA 91776-1216.
- What is Arthur Williams's phone number?
- The practice phone number listed in the NPPES registry for Arthur Williams is (626) 570-6597.
- Does Arthur Williams accept Medicare?
- Arthur Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Arthur Williams's NPI active?
- Yes — Arthur Williams's NPI (1578524617) is active in the NPPES registry as of the last update on 2009-11-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.