MS. EMILY LYDON MD
NPI 1548720733
Internal Medicine - Infectious Disease in San Francisco, CA
About Ms. Emily Lydon Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. EMILY LYDON MD (NPI 1548720733) is an individual infectious disease provider in San Francisco, California, licensed in California (A178381) and active in the NPI registry since March 2019. She is enrolled in Medicare PECOS and is a graduate of Duke University School Of Medicine (2019).
NPPES Registry Identity
Specialties & Licenses
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
Ms. Emily Lydon 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 Emily Lydon reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 2,112 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
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 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Emily Lydon's NPI number?
The NPI number for Emily Lydon is 1548720733. It was assigned to this individual provider in the NPPES registry on March 22, 2019.
Where is Emily Lydon located?
Emily Lydon practices at 513 Parnassus Ave Rm S380, San Francisco, CA 94143. The listed phone number is (415) 476-1000.
What is Emily Lydon's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Emily Lydon enrolled in Medicare?
Yes. Emily Lydon 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 Emily Lydon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Emily Lydon reassigns Medicare benefits to 3 organizations: Ucsf Medical Group Business Services (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Regents Of The University Of California (San Francisco, 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 Emily Lydon'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 Emily Lydon was last updated on March 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 months 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.
# Ms. Emily Lydon, MD · NPI 1548720733
Infectious Disease physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since March 22, 2019.
## Identity
- **NPI:** 1548720733 (Entity type: Individual)
- **Enumerated:** March 22, 2019
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** A178381 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 513 PARNASSUS AVE RM S380, San Francisco, CA 94143-2205
- **Phone:** (415) 476-1000
## 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): Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); University Of California San Francisco (NPI 1164512851, San Francisco, CA); Regents Of The University Of California (NPI 1376613943, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Duke University School Of Medicine, class of 2019
## Record status
- **NPPES last updated:** March 19, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1548720733) · Data from the CMS NPPES public registry.