Irina Williams, M.D.
NPI 1508187600 · Pain Medicine (Anesthesiology) Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Irina Williams, M.D. is a Pain Medicine (Anesthesiology) Physician provider in Oakland, CA (NPI 1508187600).
Provider details
- NPI number
- 1508187600
- Entity type
- Individual
- Primary specialty
- Pain Medicine (Anesthesiology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A130826 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
16 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
3 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Gabapentin | 47 | 14 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 21 | — |
| Pregabalin | 20 | — |
| Duloxetine Hcl | 19 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 19 | — |
| Buprenorphine Hcl | 15 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$90 across 3 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
Additional practice locations (2)
- 905 Maple St Fl 3Redwood City, CA 94063-2057Phone: (650) 299-4396
- 2255 Post StSan Francisco, CA 94115-3427Phone: (415) 885-7246
Registry dates
- Enumerated
- 2010-06-13
- Last updated
- 2024-10-01
- Certified
- 2024-10-01
Frequently asked questions
- What is Irina Williams's NPI number?
- Irina Williams's National Provider Identifier (NPI) is 1508187600, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Irina Williams's specialty?
- Irina Williams is listed in the NPPES registry with a primary specialty of Pain Medicine (Anesthesiology) Physician (Allopathic & Osteopathic Physicians).
- Where is Irina Williams located?
- Irina Williams's practice location on file with NPPES is 1411 E 31st St, Oakland, CA 94602.
- What is Irina Williams's phone number?
- The practice phone number listed in the NPPES registry for Irina Williams is (510) 437-4800.
- Does Irina Williams accept Medicare?
- Irina Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Irina Williams's NPI active?
- Yes — Irina Williams's NPI (1508187600) 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.