Karen Yue-Shang Fann, D.O.
Otolaryngology Physician · Mountain View, CA
Karen Yue-Shang Fann, D.O. is an otolaryngology physician with a practice address in Mountain View, California, and NPI 1265635023, issued on Jun 8, 2007. Check the license (California 20A9852, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen Yue-Shang Fann
- Credential
- D.O.
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- 20A9852 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2495 Hospital Dr Ste 450, Mountain View, CA 94040
- Phone
- (650) 988-4161
- Enumerated
- Jun 8, 2007
- Record last updated
- Nov 11, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (650) 988-4162
- Medicare enrollment
- Enrolled (PECOS I20080516000284); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 1,212 in California → Look up another NPI →
Also registered at 2495 Hospital Dr Ste 450
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Karen Yue-Shang Fann in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A9852Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
69% more Medicare Part D claims than the average otolaryngology physician in 2024
912 Medicare Part D claims for 268 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D.
Most prescribed
- Montelukast Sodium168 claims
- Azelastine Hcl151 claims
- Fluticasone Propionate144 claims
- Ipratropium Bromide65 claims
- Omeprazole65 claims
- Fluocinolone Acetonide Oil36 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): 83.6 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).
Industry payments in 2024: $124.84
6 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 6,429 providers of this specialty with any payment received $1,922.50 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- EL Camino Health Medical Network LLCMountain View, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Yue-Shang Fann among 1,212 otolaryngology physician records in California
Karen Yue-Shang Fann, D.O. is one of 1,212 otolaryngology physician records with a practice address in California. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 42% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated2002 · median 2004 among the 818 with a school on file
- Record last updated2020 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in California
There are 1,212 otolaryngology physician records in California.
All 1,212 in California → Every provider in Mountain View → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Patrick Fann, MDMountain View, CA 940401053408542
- Deborah Freehling, MEDICAL DOCTORMountain View, CA 940401629246798
- Robert Huang, MDMountain View, CA 940401306926985
- Eugene Kim, MDMountain View, CA 940401891879516
- Flavio Oliveira, MD, PHDMountain View, CA 940401932698065
- David Saito, M.D.Mountain View, CA 940401710015557
- Andrew Tomlinson, M.D.Atherton, CA 940271992095830
- Catherina Greenberg, MDMenlo Park, CA 940251629606538
Common questions
What is Karen Yue-Shang Fann, D.O.'s NPI number?
Karen Yue-Shang Fann, D.O.'s National Provider Identifier (NPI) is 1265635023, issued on Jun 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Karen Yue-Shang Fann, D.O. located?
The NPPES record lists a practice address at 2495 Hospital Dr Ste 450, Mountain View, CA, 94040. Phone: (650) 988-4161. Providers update this record themselves, so call before visiting.
How can I verify Karen Yue-Shang Fann, D.O.'s license?
NPPES lists California license number 20A9852, 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 Karen Yue-Shang Fann, D.O. prescribe under Medicare Part D?
In 2024, Karen Yue-Shang Fann, D.O. had 912 Medicare Part D claims for 268 beneficiaries; the average among otolaryngology physician prescribers was 541. Part D covers Medicare prescriptions only.
What is Karen Yue-Shang Fann, D.O.'s MIPS final score?
The 2023 MIPS final score is 83.6 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.