Timothy F. Tirrell, MD, PHD
Pediatric Surgery Physician · Palo Alto, CA
Timothy F. Tirrell, MD, PHD is a pediatric surgery physician with a practice address in Palo Alto, California, and NPI 1386026128, issued on Jun 28, 2015. Check the license (California A145045, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Timothy F. Tirrell
- Credential
- MD, PHD
- Primary taxonomy
- Pediatric Surgery Physician 2086S0120X
- License number
- A145045 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
- Jun 28, 2015
- Record last updated
- Nov 11, 2024
- Medicare enrollment
- Enrolled (PECOS I20240813003314); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2015
- Entity
- Type 1 · individual
8 nearest pediatric surgery physician records → All 142 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 Timothy F. Tirrell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A145045Check 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).
Timothy F. Tirrell among 142 pediatric surgery physician records in California
Timothy F. Tirrell, MD, PHD is one of 142 pediatric surgery physician records with a practice address in California. 47% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 87% of them.
- NPI issued2015 · 87% of these records are older, 11% newer
- In a Medicare fileYes · 47% of these records are
- In the CMS Doctors and Clinicians fileYes · 22% of these records are
- Graduated2015 · median 2007 among the 31 with a school on file
- Record last updated2024 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2086S0120X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatric Surgery Physician providers in California
There are 142 pediatric surgery physician records in California.
All 142 in California → Every provider in Palo Alto → Pediatric Surgery Physician nationwide →
The 8 pediatric surgery physician records with the nearest ZIP codes
- Stephanie Chao, MDPalo Alto, CA 943041952598708
- Bill Chiu, MDPalo Alto, CA 943041891010864
- James Dunn, MDPalo Alto, CA 943041962418137
- Gillian Fell, M.D., PH.D.Palo Alto, CA 943041689931164
- Julie Fuchs, MDPalo Alto, CA 943041417971151
- Gary Hartman, M.D.Palo Alto, CA 943041982751004
- Thomas Hui, MDPalo Alto, CA 943041487725206
- Jeong Hyun, MDPalo Alto, CA 943041245499896
Common questions
What is Timothy F. Tirrell, MD, PHD's NPI number?
Timothy F. Tirrell, MD, PHD's National Provider Identifier (NPI) is 1386026128, issued on Jun 28, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Timothy F. Tirrell, MD, PHD 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 Timothy F. Tirrell, MD, PHD's license?
NPPES lists California license number A145045, 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.