IRINA V WILLIAMS M.D.
NPI 1508187600
Anesthesiology - Pain Medicine in Oakland, CA
About Irina V Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
IRINA V WILLIAMS M.D. (NPI 1508187600) is an individual pain medicine provider in Oakland, California, licensed in California (A130826) and active in the NPI registry since June 2010. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2008).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Irina V Williams M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show Irina Williams reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oakland, CA 94602
- Reassigned Medicare billing, California enrollment
- 900 clinicians in this Medicare group
San Francisco, CA 94116
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
San Jose, CA 95113
- Reassigned Medicare billing, California and Colorado enrollments
- Medicare enrollment name: Lin Health Medical Group Of California PC
- 3 clinicians in this Medicare group
Denver, CO 80216
- Reassigned Medicare billing, California and Colorado enrollments
- 3 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OAKLAND, CA 94602
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Irina Williams's NPI number?
The NPI number for Irina Williams is 1508187600. It was assigned to this individual provider in the NPPES registry on June 13, 2010. The provider is also known as Irina V Khrenova MD.
Where is Irina Williams located?
Irina Williams practices at 1411 E 31st St, Oakland, CA 94602. The listed phone number is (510) 437-4800.
What is Irina Williams's specialty?
The primary specialty registered for this NPI is Anesthesiology, specializing in Pain Medicine, with taxonomy code 207LP2900X.
Is Irina Williams enrolled in Medicare?
Yes. Irina Williams is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Irina Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Irina Williams reassigns Medicare benefits to 4 organizations: Alameda Health System (Oakland, CA), Permanente Medical Group Inc (San Francisco, CA), Lin Health Medical Group Of California, P.C. (San Jose, CA) and Lin Health Medical Group PA (Denver, CO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Irina Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Irina Williams was last updated on October 1, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Irina V Williams, M.D. · NPI 1508187600
Pain Medicine physician in Oakland, California. Individual provider, active in the CMS NPPES registry since June 13, 2010.
## Identity
- **NPI:** 1508187600 (Entity type: Individual)
- **Enumerated:** June 13, 2010
- **Primary specialty:** Anesthesiology - Pain Medicine · taxonomy 207LP2900X
- **State license:** A130826 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1411 E 31ST ST, Oakland, CA 94602
- **Phone:** (510) 437-4800
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Alameda Health System (NPI 1740332931, Oakland, CA); Permanente Medical Group Inc (NPI 1841373800, San Francisco, CA); Lin Health Medical Group Of California, P.C. (NPI 1538841101, San Jose, CA); Lin Health Medical Group PA (NPI 1013643436, Denver, CO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2008
## Record status
- **NPPES last updated:** October 1, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1508187600) · Data from the CMS NPPES public registry.