Alexander Lo, MD
NPI 1942405592 · Emergency Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Lo, MD is a Emergency Medicine Physician provider in Chicago, IL (NPI 1942405592).
Provider details
- NPI number
- 1942405592
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD.31044 (AL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
477 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 354 | $191 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 91 | $132 |
| Critical Care, First 30-74 Minutes99291 | 19 | $229 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 13 | $73 |
Typical Medicare-allowed amounts for these services range $73–$229 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 619 19th Street South, Suite Ohb 251Univ Alabama Birmingham Dept Emergency MedicineBirmingham, AL 35249-7013Phone: (205) 975-7389Fax: (205) 975-4662
Registry dates
- Enumerated
- 2007-06-15
- Last updated
- 2018-03-17
Frequently asked questions
- What is Alexander Lo's NPI number?
- Alexander Lo's National Provider Identifier (NPI) is 1942405592, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Lo's specialty?
- Alexander Lo is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander Lo located?
- Alexander Lo's practice location on file with NPPES is 211 E Ontario St Ste 200, Chicago, IL 60611-3284.
- What is Alexander Lo's phone number?
- The practice phone number listed in the NPPES registry for Alexander Lo is (312) 926-5873.
- Does Alexander Lo accept Medicare?
- Alexander Lo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Lo's NPI active?
- Yes — Alexander Lo's NPI (1942405592) is active in the NPPES registry as of the last update on 2018-03-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.