YUN SOK CHOI MD
NPI 1669527164
Anesthesiology in Walnut Creek, CA

Q: What is Yun Sok Choi's NPI number?

The NPI number for Yun Sok Choi is 1669527164. It was assigned to this individual provider in the NPPES registry on January 24, 2007. The provider is also known as Randall Yun Sok Choi MD.

Q: What is Yun Sok Choi's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Q: When was this NPI record last updated?

The NPPES record for Yun Sok Choi was last updated on December 2, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 months 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.

Active since January 24, 2007PECOS Enrolled

1601 YGNACIO VALLEY RD, WALNUT CREEK, CA 94598(925) 939-3000 Get Directions Write a Review

NPPES record last updated: December 2, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Yun Sok Choi Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

YUN SOK CHOI MD (NPI 1669527164) is an individual anesthesiology provider in Walnut Creek, California, licensed in California (G75578) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS and maintains a secondary practice location in Walnut Creek.

NPPES Registry Identity

NPI1669527164

Entity TypeIndividualMale

Primary Taxonomy207L00000X

Provider Legal NameYUN SOK CHOICredential: MD

Location Address1601 YGNACIO VALLEY RDWalnut Creek, CA 94598-3122

Mailing AddressPo Box 7793San Francisco, CA 94120-7793 · (503) 372-2740

Phone(925) 939-3000

Sole ProprietorNo

Enumeration DateJanuary 24, 2007

Last NPPES UpdateDecember 2, 2024

NPPES CertifiedDecember 2, 2024

✔ NPI 1669527164 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians

Taxonomy Code207L00000X

License✔ Licensed in CA · G75578

Definition

An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.

1601 YGNACIO VALLEY RD, Walnut Creek, CA 94598

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Other Names 1

Professional Name (2)Randall Yun Sok Choi Md

Secondary Practice Location 1

Location 12637 Shadelands DrWalnut Creek, CA 94598-2512 · Phone (925) 627-3424

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Yun Sok Choi Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Yun Sok Choi reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

John Muir Trauma Physicians Billing Service

Same address

Hospitalist

1601 YGNACIO VALLEY RD
Walnut Creek, CA 94598

Reassigned Medicare billing, California enrollment
810 clinicians in this Medicare group

NPI 1093864837 (925) 947-5331

Bass Medical Group

1.2 mi

Orthopaedic Surgery

390 N WIGET LN STE 100
Walnut Creek, CA 94598

Reassigned Medicare billing, California enrollment
347 clinicians in this Medicare group

NPI 1043616600 (925) 944-0110

Premier Anesthesia Of California, PC

10 mi

Anesthesiology

6001 NORRIS CANYON RD
San Ramon, CA 94583

Reassigned Medicare billing, California enrollment
176 clinicians in this Medicare group

NPI 1770691859 (925) 275-9200

G2 Anesthesia PC

46 mi

Anesthesiology

15466 LOS GATOS BLVD STE 109-297
Los Gatos, CA 95032

Reassigned Medicare billing, California enrollment
140 clinicians in this Medicare group

NPI 1487214698 (408) 354-2114

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.

Reported Quality Measures

Post-Anesthetic Transfer of Care Measure: Procedure Room to a Post Anesthesia Care Unit (PACU)

Percentage of patients, regardless of age, who are under the care of an anesthesia practitioner and are admitted to a PACU or other non-ICU location in which a post-anesthetic formal transfer of care protocol or checklist which includes the key transfer of…

2%132 patients1/55-star benchmark: 100%

Pre-operative OSA assessment

Percentage of patients who undergo a surgical procedure in the operating room/procedure room that have a pre-operative assessment for Obstructive Sleep Apnea (OSA)

98%528 patients4/55-star benchmark: 100%

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

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.

MALCOLM C JOHNSON MD

Emergency Medicine