Tiffany Ngai, M.D.
Infectious Disease Physician · Santa Rosa, CA
Tiffany Ngai, M.D. is an infectious disease physician with a practice address in Santa Rosa, California, and NPI 1215378930, issued on Jul 10, 2013. Check the license (California A138387, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tiffany Ngai
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- A138387 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1165 Montgomery Dr, Santa Rosa, CA 95405
- Phone
- (707) 547-5437
- Enumerated
- Jul 10, 2013
- Record last updated
- Nov 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (707) 547-5430
- Medicare enrollment
- Enrolled (PECOS I20181017001345); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 1165 Montgomery Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maryam Aghighi, MDAnatomic Pathology & Clinical Pathology Physician1073074977
- Johnathan Agil, MDEmergency Medicine Physician1700413002
- Katherine Aldrich, NPAdult Health Nurse Practitioner1194995563
- Mujeeb Altaf, MBBS.,MRCP(UK)Hospitalist Physician1316125941
- Rebecca Althoff, RNFARegistered Nurse First Assistant1427119668
- Sanyogeeta Bhaway, M.D.Internal Medicine Physician1275828162
Verify Tiffany Ngai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A138387Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% fewer Medicare Part D claims than the average infectious disease physician in 2024
354 Medicare Part D claims for 62 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin66 claims
- Amoxicillin-Clavulanate Potass33 claims
- Ertapenem29 claims
- Daptomycin24 claims
- Cefepime Hcl23 claims
- Vancomycin Hcl22 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
- Providence Medical FoundationSanta Rosa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tiffany Ngai among 1,119 infectious disease physician records in California
Tiffany Ngai, M.D. is one of 1,119 infectious disease physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 77% of them.
- NPI issued2013 · 77% of these records are older, 20% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2013 · median 2003 among the 735 with a school on file
- Record last updated2021 · 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 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in Santa Rosa → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Frederick Drach, M.D.Santa Rosa, CA 954051326083213
- Ye ThuSanta Rosa, CA 954051306180146
- Andrew Desruisseau, M.D.Santa Rosa, CA 954031518945658
- Gary Green, MDSanta Rosa, CA 954031124102108
- David Sidney, MDSanta Rosa, CA 954091841358975
- Shu Yang, MDSanta Rosa, CA 954091093873119
- Alexander Evens, D.O.Turlock, CA 953821114144649
- Jennifer Leoniak, D.O., M.S.Turlock, CA 953821588808703
Common questions
What is Tiffany Ngai, M.D.'s NPI number?
Tiffany Ngai, M.D.'s National Provider Identifier (NPI) is 1215378930, issued on Jul 10, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Tiffany Ngai, M.D. located?
The NPPES record lists a practice address at 1165 Montgomery Dr, Santa Rosa, CA, 95405. Phone: (707) 547-5437. Providers update this record themselves, so call before visiting.
How can I verify Tiffany Ngai, M.D.'s license?
NPPES lists California license number A138387, 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 Tiffany Ngai, M.D. prescribe under Medicare Part D?
In 2024, Tiffany Ngai, M.D. had 354 Medicare Part D claims for 62 beneficiaries; the average among infectious disease physician prescribers was 689. 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.