WARREN DAVID KING M.D.
NPI 1154485753
Orthopaedic Surgery - Sports Medicine in San Mateo, CA

Q: What is Warren King's NPI number?

The NPI number for Warren King is 1154485753. It was assigned to this individual provider in the NPPES registry on December 20, 2006.

Q: What is Warren King's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Sports Medicine, with taxonomy code 207XX0005X.

Q: When was this NPI record last updated?

The NPPES record for Warren King was last updated on March 24, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.

Active since December 20, 2006PECOS Enrolled

100 S ELLSWORTH AVE STE 504, SAN MATEO, CA 94401(650) 380-5695(650) 260-2170 Get Directions Write a Review

NPPES record last updated: March 24, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Mar 24, 2023, Mar 3, 2020 (2 updates tracked since 2020).

On this page

About Warren David King M.d. NPPES

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

WARREN DAVID KING M.D. (NPI 1154485753) is an individual sports medicine provider in San Mateo, California, licensed in California (G53371) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1154485753

Entity TypeIndividualMale

Primary Taxonomy207XX0005X

Provider Legal NameWARREN DAVID KINGCredential: M.D.

Location Address100 S ELLSWORTH AVE STE 504San Mateo, CA 94401-3929

Mailing Address100 S Ellsworth Ave Ste 504San Mateo, CA 94401-3929 · (650) 380-5695 · Fax (650) 260-2170

Phone(650) 380-5695

Fax(650) 260-2170

Sole ProprietorYes

Enumeration DateDecember 20, 2006

Last NPPES UpdateMarch 24, 20232 updates tracked since enumeration

NPPES CertifiedMarch 24, 2023

✔ NPI 1154485753 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOrthopaedic Surgery · Sports MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207XX0005X

License✔ Licensed in CA · G53371

Definition

An orthopaedic surgeon trained in sports medicine provides appropriate care for all structures of the musculoskeletal system directly affected by participation in sporting activity. This specialist is proficient in areas including conditioning, training and fitness, athletic performance and the impact of dietary supplements, pharmaceuticals, and nutrition on performance and health, coordination of care within the team setting utilizing other health care professionals, field evaluation and management, soft tissue biomechanics and injury healing and repair. Knowledge and understanding of the principles and techniques of rehabilitation, athletic equipment and orthotic devices enables the specialist to prevent and manage athletic injuries.

Also ListedOrthopaedic SurgeryTaxonomy 207X00000X · License G53371 (CA)

100 S ELLSWORTH AVE STE 504, San Mateo, CA 94401

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Kaiser Permanente.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Warren David King M.d. 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 Warren King reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Sutter Bay Medical Foundation

5.4 mi

Ambulatory Surgical

301 INDUSTRIAL RD
San Carlos, CA 94070

Reassigned Medicare billing, California enrollment
Also billed through NPI 1982845186 (California), NPI 1497996524 (California)
393 clinicians in this Medicare group

NPI 1164840088 (650) 596-4200

Marshall Medical Center

101 mi

Family Medicine

5137 GOLDEN FOOTHILL PKWY, SUITE 120
El Dorado Hills, CA 95762

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

NPI 1972657559 (916) 399-8010

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

PENINSULA AMBULATORY MEDICAL SERVICES PC

Clinic/Center (Pain)

100 S ELLSWORTH AVE STE 504
SAN MATEO, CA 94401

San Mateo County (650) 507-3348

HUGHES ORTHOPEDICS PC

Orthopaedic Surgery

100 S ELLSWORTH AVE STE 504
SAN MATEO, CA 94401

San Mateo County (650) 343-5633

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 Warren King's NPI number?

The NPI number for Warren King is 1154485753. It was assigned to this individual provider in the NPPES registry on December 20, 2006.

Where is Warren King located?

Warren King practices at 100 S Ellsworth Ave Ste 504, San Mateo, CA 94401. The listed phone number is (650) 380-5695.

What is Warren King's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Sports Medicine, with taxonomy code 207XX0005X.

Is Warren King enrolled in Medicare?

Yes. Warren King is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Warren King's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Warren King reassigns Medicare benefits to 2 organizations: Sutter Bay Medical Foundation (San Carlos, CA) and Marshall Medical Center (El Dorado Hills, CA). 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 Warren King's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Warren King accept?

Health plans from Kaiser Permanente list Warren King as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Warren King was last updated on March 24, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.