Marisa Tienyun Smith, MD
Emergency Medicine Physician · Redwood City, CA
Marisa Tienyun Smith, MD is an emergency medicine physician with a practice address in Redwood City, California, and NPI 1447756259, issued on Apr 2, 2018. Check the license (California A185755, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marisa Tienyun Smith
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A185755 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1100 Veterans Blvd, Redwood City, CA 94063
- Phone
- (650) 299-2000
- Enumerated
- Apr 2, 2018
- Record last updated
- Jun 26, 2026
- Medicare enrollment
- Enrolled (PECOS I20230707000998); accepts Medicare assignment
- Medical or professional school
- Wright State University Boonshoft School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1100 Veterans Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Dynah BartePharmacist1902441892
- Krista Bartlett, PA-CPhysician Assistant1578828117
- Liam Bosch, MDAdult Reconstructive Orthopaedic Surgery Physician1750814554
- Wesley Briones, PT, DPTPhysical Therapist1336624733
Verify Marisa Tienyun Smith in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A185755Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% fewer Medicare Part D claims than the average emergency medicine physician in 2024
50 Medicare Part D claims for 38 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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): 76.5 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
- Pacific Emergency Providers A Prof CorpSan Diego, CA
- Regents OF The University OF CaliforniaEl Centro, CA
- Regents OF The University OF CaliforniaSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marisa Tienyun Smith among 7,751 emergency medicine physician records in California
Marisa Tienyun Smith, MD is one of 7,751 emergency medicine 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 2018, is newer than 81% of them.
- NPI issued2018 · 81% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2018 · median 2011 among the 4,560 with a school on file
- Record last updated2026 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Redwood City → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- James Ahn, MDRedwood City, CA 940631528146180
- Sunil Bhopale, MDRedwood City, CA 940631760561807
- George Bulloch, MDRedwood City, CA 940631134207723
- Gustavo Diaz, MDRedwood City, CA 940631538122635
- Walter Eades, MDRedwood City, CA 940631467530006
- Micheal Heinrich, M.D.Redwood City, CA 940631427150531
- Adam Landsdorf, MDRedwood City, CA 940631134207798
- Gregg Letsinger, MDRedwood City, CA 940631962580555
Common questions
What is Marisa Tienyun Smith, MD's NPI number?
Marisa Tienyun Smith, MD's National Provider Identifier (NPI) is 1447756259, issued on Apr 2, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Marisa Tienyun Smith, MD located?
The NPPES record lists a practice address at 1100 Veterans Blvd, Redwood City, CA, 94063. Phone: (650) 299-2000. Providers update this record themselves, so call before visiting.
How can I verify Marisa Tienyun Smith, MD's license?
NPPES lists California license number A185755, 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 Marisa Tienyun Smith, MD prescribe under Medicare Part D?
In 2024, Marisa Tienyun Smith, MD had 50 Medicare Part D claims for 38 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Marisa Tienyun Smith, MD's MIPS final score?
The 2023 MIPS final score is 76.5 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.