ALAN ALBERT LY DO
NPI 1972008191
Emergency Medicine in Pleasanton, CA
About Alan Albert Ly Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALAN ALBERT LY DO (NPI 1972008191) is an individual emergency medicine provider in Pleasanton, California, licensed in California (20A18754) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS and is a graduate of Other (2018).
NPPES Registry Identity
Specialties & Licenses 2
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
Alan Albert Ly Do 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
4Medicare enrollment records show Alan Ly reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Pleasanton, CA 94588
- Reassigned Medicare billing, California enrollment
- 50 clinicians in this Medicare group
Fremont, CA 94538
- Reassigned Medicare billing, California enrollment
- 103 clinicians in this Medicare group
Tracy, CA 95376
- Reassigned Medicare billing, California enrollment
- 57 clinicians in this Medicare group
San Jose, CA 95128
- Reassigned Medicare billing, California enrollment
- 197 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 6
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 94588 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.
PLEASANTON, CA 94588
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 Alan Ly's NPI number?
The NPI number for Alan Ly is 1972008191. It was assigned to this individual provider in the NPPES registry on March 28, 2018.
Where is Alan Ly located?
Alan Ly practices at 5555 W Las Positas Blvd, Pleasanton, CA 94588. The listed phone number is (415) 990-3017.
What is Alan Ly's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Alan Ly enrolled in Medicare?
Yes. Alan Ly 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 Alan Ly's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alan Ly reassigns Medicare benefits to 4 organizations: Pleasanton Emergency Medical Group (Pleasanton, CA), Emergency Physicians Associates Fremont PC (Fremont, CA), Altamont Emergency Physicians Medical Group Inc (Tracy, CA) and Emergency Physicians Associates San Jose PC (San Jose, 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 Alan Ly'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 Alan Ly was last updated on December 19, 2022. 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.
# Alan Albert Ly, DO · NPI 1972008191
Emergency Medicine physician in Pleasanton, California. Individual provider, active in the CMS NPPES registry since March 28, 2018.
## Identity
- **NPI:** 1972008191 (Entity type: Individual)
- **Enumerated:** March 28, 2018
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 20A18754 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 5555 W LAS POSITAS BLVD, Pleasanton, CA 94588-4000
- **Phone:** (415) 990-3017
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Pleasanton Emergency Medical Group (NPI 1285625509, Pleasanton, CA); Emergency Physicians Associates Fremont PC (NPI 1790250967, Fremont, CA); Altamont Emergency Physicians Medical Group Inc (NPI 1952392375, Tracy, CA); Emergency Physicians Associates San Jose PC (NPI 1306311576, San Jose, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2018
## Record status
- **NPPES last updated:** December 19, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1972008191) · Data from the CMS NPPES public registry.