NICHOLAS P LYON
NPI 1083233704
Anesthesiology in San Francisco, CA
About Nicholas P Lyon NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NICHOLAS P LYON (NPI 1083233704) is an individual anesthesiology provider in San Francisco, California, licensed in California (A210532) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, is affiliated with Northwestern Medicine Mchenry, and maintains a secondary practice location in Huntley.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Accepted Insurance
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
Nicholas P Lyon 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 Nicholas Lyon reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 723 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
Phoenix, AZ 85012
- Reassigned Medicare billing, Arizona enrollment
- 1,514 clinicians in this Medicare group
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 clinicians in this Medicare group
Anchorage, AK 99508
- Reassigned Medicare billing, Alaska enrollment
- Medicare enrollment name: Providence Anchorage Anesthesia Medical Group PC
- 90 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 3
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 Medicine Mchenry
Acute Care Hospitals · Mchenry, ILOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN FRANCISCO, CA 94143
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 Nicholas Lyon's NPI number?
The NPI number for Nicholas Lyon is 1083233704. It was assigned to this individual provider in the NPPES registry on April 13, 2020.
Where is Nicholas Lyon located?
Nicholas Lyon practices at 521 Parnassus Ave, San Francisco, CA 94143. The listed phone number is (415) 476-9035.
What is Nicholas Lyon's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Nicholas Lyon enrolled in Medicare?
Yes. Nicholas Lyon 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 Nicholas Lyon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Lyon reassigns Medicare benefits to 6 organizations: University Anesthesia Medical Group (San Francisco, CA), University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA), Banner-University Medical Group (Phoenix, AZ), Northwestern Medical Faculty Foundation (Carol Stream, IL) 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 Nicholas Lyon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nicholas Lyon accept?
Health plans from Blue Cross Blue Shield of Arizona and Oscar Health Plan, Inc. list Nicholas Lyon as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Nicholas Lyon affiliated with any hospitals?
According to CMS data, Nicholas Lyon is affiliated with Northwestern Medicine Mchenry.
When was this NPI record last updated?
The NPPES record for Nicholas Lyon was last updated on August 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Nicholas P Lyon · NPI 1083233704
Anesthesiology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since April 13, 2020.
## Identity
- **NPI:** 1083233704 (Entity type: Individual)
- **Enumerated:** April 13, 2020
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** A210532 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 521 PARNASSUS AVE, San Francisco, CA 94143-2206
- **Phone:** (415) 476-9035
## 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): University Anesthesia Medical Group (NPI 1528137296, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); Banner-University Medical Group (NPI 1508809427, Phoenix, AZ); Northwestern Medical Faculty Foundation (NPI 1346235314, Carol Stream, IL); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Chicago, Pritzker School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** August 4, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1083233704) · Data from the CMS NPPES public registry.