DR. WILLIAM LI MD
NPI 1154703940
Internal Medicine - Critical Care Medicine in Los Angeles, CA
About Dr. William Li Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM LI MD (NPI 1154703940) is an individual critical care medicine provider in Los Angeles, California, licensed in California (A150608) and active in the NPI registry since June 2015. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2015).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Group Practice 1
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
Dr. William Li Md 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
6Medicare enrollment records show William Li reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Angeles, CA 90027
- Reassigned Medicare billing, California enrollment
- 28 clinicians in this Medicare group
Los Angeles, CA 90027
- Reassigned Medicare billing, California enrollment
Glendale, CA 91204
- Reassigned Medicare billing, California enrollment
- 61 clinicians in this Medicare group
Arcadia, CA 91007
- Reassigned Medicare billing, California enrollment
- 39 clinicians in this Medicare group
Palmdale, CA 93551
- Reassigned Medicare billing, California enrollment
- 17 clinicians in this Medicare group
Redding, CA 96001
- Reassigned Medicare billing, California enrollment
- 46 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.
Areas of Expertise CMS Part B claims 8
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90017 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
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 William Li's NPI number?
The NPI number for William Li is 1154703940. It was assigned to this individual provider in the NPPES registry on June 29, 2015.
Where is William Li located?
William Li practices at 1225 Wilshire Blvd, Los Angeles, CA 90017. The listed phone number is (213) 977-2121.
What is William Li's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is William Li enrolled in Medicare?
Yes. William Li 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 William Li's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Li reassigns Medicare benefits to 6 organizations: Hp Intensivist Medical Group, Inc (Los Angeles, CA), Gem Medical Associates (Los Angeles, CA), Willow Brook Critical Care Medical Group, Inc (Glendale, CA), Arcadia Intensivist Group, Inc. (Arcadia, CA), Palmdale Intensivist Inc (Palmdale, CA) and 1 more organization, listed in the Medicare section above. 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 William Li'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 William Li was last updated on March 22, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Dr. William Li, MD · NPI 1154703940
Critical Care Medicine physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since June 29, 2015.
## Identity
- **NPI:** 1154703940 (Entity type: Individual)
- **Enumerated:** June 29, 2015
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** A150608 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1225 WILSHIRE BLVD, Los Angeles, CA 90017-1901
- **Phone:** (213) 977-2121
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Hp Intensivist Medical Group, Inc (NPI 1578221453, Los Angeles, CA); Gem Medical Associates (NPI 1437849353, Los Angeles, CA); Willow Brook Critical Care Medical Group, Inc (NPI 1811520224, Glendale, CA); Arcadia Intensivist Group, Inc. (NPI 1598361669, Arcadia, CA); Palmdale Intensivist Inc (NPI 1033955497, Palmdale, CA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** March 22, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1154703940) · Data from the CMS NPPES public registry.