Hailyn Nielsen
Rheumatology Physician · San Francisco, CA
Hailyn Nielsen is a rheumatology physician with a practice address in San Francisco, California, and NPI 1306230669, issued on Mar 25, 2015. Check the license (California A148465, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Hailyn Nielsen
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- A148465 CA
Self-reported in NPPES; status is on the state search - Practice location
- 505 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 476-1528
- Enumerated
- Mar 25, 2015
- Record last updated
- Jul 15, 2026
- Fax
- (415) 502-1976
- Medicare enrollment
- Enrolled (PECOS I20200724001620); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 2015
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Also registered at 505 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alexander Aabedi, MDStudent in an Organized Health Care Education/Training Program1245971480
- Kathryn Aaronson, RN, CPNPPediatric Nurse Practitioner1992030951
- Sharon AbadaStudent in an Organized Health Care Education/Training Program1003492844
- Abul Abbas, MBBSAnatomic Pathology Physician1881652964
- Jesse Abelson, MDInternal Medicine Physician1083843817
- Rhonald AbitonaAcute Care Nurse Practitioner1164993473
Verify Hailyn Nielsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A148465Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average rheumatology physician in 2024
193 Medicare Part D claims for 33 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.
Most prescribed
- Prednisone59 claims
- Methotrexate25 claims
- Hydroxychloroquine Sulfate24 claims
- Alendronate Sodium13 claims
- Rasuvo11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 74.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 3 group practices
- Regents OF The University OF CaliforniaSan Francisco, CA
- Ucsf Medical Group Business ServicesBurlingame, CA
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hailyn Nielsen among 926 rheumatology physician records in California
Hailyn Nielsen is one of 926 rheumatology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 82% of them.
- NPI issued2015 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2015 · median 2003 among the 641 with a school on file
- Record last updated2026 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in California
There are 926 rheumatology physician records in California.
All 926 in California → Every provider in San Francisco → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Urmila Bajpai, M.D.San Francisco, CA 941431790932457
- Ann Mary Belek, MDSan Francisco, CA 941431780841197
- Andrew Chan, M.D.San Francisco, CA 941431578667028
- Sharon Chung, MDSan Francisco, CA 941431649393737
- Lindsey Criswell, MDSan Francisco, CA 941431881659290
- John Davis, MD, MPHSan Francisco, CA 941431912962705
- Lianne Gensler, M.D.San Francisco, CA 941431780781369
- Edward Goetzl, MDSan Francisco, CA 941431255396594
Common questions
What is Hailyn Nielsen's NPI number?
Hailyn Nielsen's National Provider Identifier (NPI) is 1306230669, issued on Mar 25, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Hailyn Nielsen located?
The NPPES record lists a practice address at 505 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 476-1528. Providers update this record themselves, so call before visiting.
How can I verify Hailyn Nielsen's license?
NPPES lists California license number A148465, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Hailyn Nielsen prescribe under Medicare Part D?
In 2024, Hailyn Nielsen had 193 Medicare Part D claims for 33 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Hailyn Nielsen's MIPS final score?
The 2023 MIPS final score is 74.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.