Elizabeth Ching Siew Twichell, MD, MPH
Internal Medicine Physician · Saint Louis, MO
Elizabeth Ching Siew Twichell, MD, MPH is an internal medicine physician with a practice address in Saint Louis, Missouri, and NPI 1073122875, issued on Jul 28, 2020. Check the license (Missouri 2024018751, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Elizabeth Ching Siew Twichell
- Credential
- MD, MPH
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 2024018751 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1 Barnes Jew Hosp Plz, Saint Louis, MO 63110
- Phone
- (314) 362-8065
- Enumerated
- Jul 28, 2020
- Record last updated
- Jun 15, 2024
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,604 in Missouri → Look up another NPI →
Also registered at 1 Barnes Jew Hosp Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Emily ActonStudent in an Organized Health Care Education/Training Program1134058506
- Sarah Addison, MDInternal Medicine Physician1255017273
- Laila Ait Haj KaddourPharmacist1043989205
- Salvador Alejo, MD PHDClinical Pathology Physician1366331191
- Waleed Ali, MDStudent in an Organized Health Care Education/Training Program1922842657
- Abbas Ali Khan, MDEmergency Medicine Physician1912740135
Verify Elizabeth Ching Siew Twichell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2024018751Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
64 Medicare Part D claims for 20 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of 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.
Elizabeth Ching Siew Twichell among 2,604 internal medicine physician records in Missouri
Elizabeth Ching Siew Twichell, MD, MPH is one of 2,604 internal medicine physician records with a practice address in Missouri. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 75% of them.
- NPI issued2020 · 75% of these records are older, 21% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 55% of these records are
- Record last updated2024 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
941 internal medicine physician records list a practice address in Saint Louis
They are 941 of the 27,605 NPPES records with a practice address in Saint Louis, and 2,604 internal medicine physician records in Missouri.
All 2,604 in Missouri → Every provider in Saint Louis → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Thomas Bartholet, MDSaint Louis, MO 631101750325742
- Rakhee Bhayani, MDSaint Louis, MO 631101477579787
- Mohammed Haque, MDSaint Louis, MO 631101689604100
- Charles Lieu, MDSaint Louis, MO 631101871510396
- Kenneth Ludmerer, MDSaint Louis, MO 631101366468597
- Barbara Lutey, MDSaint Louis, MO 631101306862628
- Heidi Miller, M.D.Saint Louis, MO 631101922082361
- Tracy Norfleet, MDSaint Louis, MO 631101487680377
Common questions
What is Elizabeth Ching Siew Twichell, MD, MPH's NPI number?
Elizabeth Ching Siew Twichell, MD, MPH's National Provider Identifier (NPI) is 1073122875, issued on Jul 28, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Elizabeth Ching Siew Twichell, MD, MPH located?
The NPPES record lists a practice address at 1 Barnes Jew Hosp Plz, Saint Louis, MO, 63110. Phone: (314) 362-8065. Providers update this record themselves, so call before visiting.
How can I verify Elizabeth Ching Siew Twichell, MD, MPH's license?
NPPES lists Missouri license number 2024018751, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Elizabeth Ching Siew Twichell, MD, MPH prescribe under Medicare Part D?
In 2024, Elizabeth Ching Siew Twichell, MD, MPH had 64 Medicare Part D claims for 20 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.