Agnieszka M. Janisiewicz, M.D.
Otolaryngology Physician · San Leandro, CA
Agnieszka M. Janisiewicz, M.D. is an otolaryngology physician with a practice address in San Leandro, California, and NPI 1467615104, issued on Jul 2, 2008. Check the license (California A108890, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Agnieszka M. Janisiewicz
- Credential
- M.D.
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- A108890 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2500 Merced St, San Leandro, CA 94577
- Phone
- (510) 454-1000
- Enumerated
- Jul 2, 2008
- Record last updated
- Feb 11, 2022
- Medicare enrollment
- Enrolled (PECOS I20131220000554); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 2008
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 1,212 in California → Look up another NPI →
Also registered at 2500 Merced St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kristi Adachi, PHARMDPharmacist1396456737
- Mary Grace Aguayo, CRTCertified Respiratory Therapist1467923730
- Jatinder AhluwaliaPharmacist1508391483
Verify Agnieszka M. Janisiewicz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A108890Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% fewer Medicare Part D claims than the average otolaryngology physician in 2024
310 Medicare Part D claims for 112 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Azelastine Hcl62 claims
- Ipratropium Bromide47 claims
- Fluticasone Propionate31 claims
- Amoxicillin-Clavulanate Potass29 claims
- Xhance20 claims
- Doxycycline Monohydrate17 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.
Bills Medicare through one group practice
- Permanente Medical Group IncRichmond, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Agnieszka M. Janisiewicz among 1,212 otolaryngology physician records in California
Agnieszka M. Janisiewicz, M.D. 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 2008, is newer than 58% of them.
- NPI issued2008 · 58% of these records are older, 35% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated2008 · median 2004 among the 818 with a school on file
- Record last updated2022 · 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 San Leandro → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Robert Wu, M. D.San Leandro, CA 945781669574059
- Carl Ermshar, M.D.Saint Helena, CA 945741982799292
- Joshua Au, M.D.San Ramon, CA 945831366701385
- Andrew Limb, M.D.San Ramon, CA 945831952488512
- Kathleyn Brandstetter, M.D.Union City, CA 945871215375621
- Nina Chinosorn, M.D.Union City, CA 945871194966085
- Stephen Jo, M.D.Union City, CA 945871972651040
- Frank Lee, M.D.Union City, CA 945871174602965
Common questions
What is Agnieszka M. Janisiewicz, M.D.'s NPI number?
Agnieszka M. Janisiewicz, M.D.'s National Provider Identifier (NPI) is 1467615104, issued on Jul 2, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Agnieszka M. Janisiewicz, M.D. located?
The NPPES record lists a practice address at 2500 Merced St, San Leandro, CA, 94577. Phone: (510) 454-1000. Providers update this record themselves, so call before visiting.
How can I verify Agnieszka M. Janisiewicz, M.D.'s license?
NPPES lists California license number A108890, 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 Agnieszka M. Janisiewicz, M.D. prescribe under Medicare Part D?
In 2024, Agnieszka M. Janisiewicz, M.D. had 310 Medicare Part D claims for 112 beneficiaries; the average among otolaryngology physician prescribers was 541. Part D covers Medicare prescriptions only.
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.