DR. ALEXANDER LO MD
NPI 1942405592
Emergency Medicine in Chicago, IL
About Dr. Alexander Lo Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ALEXANDER LO MD (NPI 1942405592) is an individual emergency medicine provider in Chicago, Illinois, licensed in Illinois (036.143442) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS, is affiliated with Northwestern Memorial Hospital, and maintains a secondary practice location in Birmingham.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 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. Alexander Lo 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
3Medicare enrollment records show Alexander Lo reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 clinicians in this Medicare group
Birmingham, AL 35294
- Reassigned Medicare billing, Alabama enrollment
- 4,494 clinicians in this Medicare group
Birmingham, AL 35249
- Reassigned Medicare billing, Alabama enrollment
- 460 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 4
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Northwestern Memorial Hospital
Acute Care Hospitals · Chicago, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60611 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 Alexander Lo's NPI number?
The NPI number for Alexander Lo is 1942405592. It was assigned to this individual provider in the NPPES registry on June 15, 2007.
Where is Alexander Lo located?
Alexander Lo practices at 211 E Ontario St Ste 200, Chicago, IL 60611. The listed phone number is (312) 926-5873.
What is Alexander Lo's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Alexander Lo enrolled in Medicare?
Yes. Alexander Lo 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 Alexander Lo's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Lo reassigns Medicare benefits to 3 organizations: Northwestern Medical Faculty Foundation (Carol Stream, IL), University Of Alabama Health Services Foundation, PC (Birmingham, AL) and University Of Alabama At Birmingham (Birmingham, AL). 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 Alexander Lo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Alexander Lo affiliated with any hospitals?
According to CMS data, Alexander Lo is affiliated with Northwestern Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Alexander Lo was last updated on March 17, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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. Alexander Lo, MD · NPI 1942405592
Emergency Medicine physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since June 15, 2007.
## Identity
- **NPI:** 1942405592 (Entity type: Individual)
- **Enumerated:** June 15, 2007
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 036.143442 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 211 E ONTARIO ST STE 200, Chicago, IL 60611-3284
- **Phone:** (312) 926-5873
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Northwestern Medical Faculty Foundation (NPI 1346235314, Carol Stream, IL); University Of Alabama Health Services Foundation, PC (NPI 1366638330, Birmingham, AL); University Of Alabama At Birmingham (NPI 1356674360, Birmingham, AL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2007
## Record status
- **NPPES last updated:** March 17, 2018
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Source: [NPI Profile](https://npiprofile.com/npi/1942405592) · Data from the CMS NPPES public registry.