HAILYN NIELSEN
NPI 1306230669
Internal Medicine - Rheumatology in San Francisco, CA
About Hailyn Nielsen NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
HAILYN NIELSEN (NPI 1306230669) is an individual rheumatology provider in San Francisco, California, licensed in California (A148465) and active in the NPI registry since March 2015. She is enrolled in Medicare PECOS and is a graduate of University Of Washington School Of Medicine (2015).
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
Hailyn Nielsen 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 Hailyn Nielsen reassigns Medicare billing to 4 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
- 2,112 clinicians in this Medicare group
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 94110
- Reassigned Medicare billing, California enrollment
- 637 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 2
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.
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.
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
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 Hailyn Nielsen's NPI number?
The NPI number for Hailyn Nielsen is 1306230669. It was assigned to this individual provider in the NPPES registry on March 25, 2015.
Where is Hailyn Nielsen located?
Hailyn Nielsen practices at 505 Parnassus Ave Room 987, San Francisco, CA 94143. The listed phone number is (415) 476-1528.
What is Hailyn Nielsen's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.
Is Hailyn Nielsen enrolled in Medicare?
Yes. Hailyn Nielsen 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 Hailyn Nielsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Hailyn Nielsen reassigns Medicare benefits to 4 organizations: Regents Of The University Of California (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and University Of California Sfgh Medical Group (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 Hailyn Nielsen'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 Hailyn Nielsen was last updated on July 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Hailyn Nielsen · NPI 1306230669
Rheumatology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since March 25, 2015.
## Identity
- **NPI:** 1306230669 (Entity type: Individual)
- **Enumerated:** March 25, 2015
- **Primary specialty:** Internal Medicine - Rheumatology · taxonomy 207RR0500X
- **State license:** A148465 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 505 PARNASSUS AVE, ROOM 987, San Francisco, CA 94143-0119
- **Phone:** (415) 476-1528 · **Fax:** (415) 502-1976
## 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): Regents Of The University Of California (NPI 1376613943, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); University Of California San Francisco (NPI 1164512851, San Francisco, CA); University Of California Sfgh Medical Group (NPI 1356696215, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Washington School Of Medicine, class of 2015
## Record status
- **NPPES last updated:** July 15, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1306230669) · Data from the CMS NPPES public registry.