Xin Si, MD
Pediatric Pulmonology Physician · Palo Alto, CA
Xin Si, MD is a pediatric pulmonology physician with a practice address in Palo Alto, California, and NPI 1639581804, issued on May 22, 2014. Check the license (California A154969, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Xin Si
- Credential
- MD
- Primary taxonomy
- Pediatric Pulmonology Physician 2080P0214X
- License number
- A154969 CA
Self-reported in NPPES; status is on the state search - Practice location
- 725 Welch RD, Palo Alto, CA 94304
- Phone
- (650) 497-8000
- Enumerated
- May 22, 2014
- Record last updated
- Apr 27, 2024
- Medicare enrollment
- Enrolled (PECOS I20210715001913); accepts Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 2014
- Entity
- Type 1 · individual
8 nearest pediatric pulmonology physician records → All 139 in California → Look up another NPI →
Also registered at 725 Welch RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shayda Abadi, NPNurse Practitioner1316745540
- Natasha AbadillaStudent in an Organized Health Care Education/Training Program1194306928
- Alexandra Abbott, MDPediatrics Physician1760018675
- Steven Abboud, MDAnesthesiology Physician1619364908
- Ali Abdelhafiz Abdelsamea, MDPediatrics Physician1699390104
- Alireza Abdollah Shamshirsaz, M.D.Obstetrics & Gynecology Physician1881804235
Verify Xin Si in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A154969Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Lpch Medical Group Div OF LucilePalo Alto, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Xin Si among 139 pediatric pulmonology physician records in California
Xin Si, MD is one of 139 pediatric pulmonology physician records with a practice address in California. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 73% of them.
- NPI issued2014 · 73% of these records are older, 21% newer
- In a Medicare fileYes · 61% of these records are
- In the CMS Doctors and Clinicians fileYes · 32% of these records are
- Graduated2014 · median 2006 among the 45 with a school on file
- Record last updated2024 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0214X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatric Pulmonology Physician providers in California
There are 139 pediatric pulmonology physician records in California.
All 139 in California → Every provider in Palo Alto → Pediatric Pulmonology Physician nationwide →
The 8 pediatric pulmonology physician records with the nearest ZIP codes
- Sumit Bhargava, MDPalo Alto, CA 943041275516361
- Alan Cohen, M.D.Palo Alto, CA 943041528194024
- David Cornfield, MDPalo Alto, CA 943041598792079
- Karen Hardy, MDPalo Alto, CA 943041508971938
- Christin Kuo, MDPalo Alto, CA 943041487840443
- John Mark, MDPalo Alto, CA 943041801810353
- Carlos Milla, MDPalo Alto, CA 943041720164080
- Esmeralda Morales, MDPalo Alto, CA 943041669697546
Common questions
What is Xin Si, MD's NPI number?
Xin Si, MD's National Provider Identifier (NPI) is 1639581804, issued on May 22, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Xin Si, MD located?
The NPPES record lists a practice address at 725 Welch RD, Palo Alto, CA, 94304. Phone: (650) 497-8000. Providers update this record themselves, so call before visiting.
How can I verify Xin Si, MD's license?
NPPES lists California license number A154969, 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.
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.