Robert Lien Yin, M.D.
Gastroenterology Physician · Timonium, MD
Robert Lien Yin, M.D. is a gastroenterology physician with a practice address in Timonium, Maryland, and NPI 1750483863, issued on Sep 1, 2006. Check the license (Maryland D0030264, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Robert Lien Yin
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- D0030264 MD
Self-reported in NPPES; status is on the state search - Practice location
- 404 E Timonium RD, Timonium, MD 21093
- Phone
- (410) 530-0113
- Enumerated
- Sep 1, 2006
- Record last updated
- Jan 2, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicaid ID
- 329391200 MD
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 505 in Maryland → Look up another NPI →
Verify Robert Lien Yin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0030264Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 80% of the cost of the top drugs
195 Medicare Part D claims for 134 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were over 99% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Shingrix87 claims
- Boostrix Tdap80 claims
- Havrix20 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.
Robert Lien Yin among 505 gastroenterology physician records in Maryland
Robert Lien Yin, M.D. is one of 505 gastroenterology physician records with a practice address in Maryland. 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 2006, is newer than 16% of them.
- NPI issued2006 · 16% of these records are older, 46% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2014 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Maryland
There are 505 gastroenterology physician records in Maryland.
All 505 in Maryland → Every provider in Timonium → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- John Affronti, M.D.Lutherville, MD 210931023020872
- Marshall Bedine, M.D.Lutherville, MD 210931194719658
- Peter Belitsos, M.D.Lutherville, MD 210931619978871
- John Covington, M.D.Lutherville, MD 210931629170246
- David Cromwell, M.D.Lutherville, MD 210931063415271
- Frederik Hansen, M.D.Lutherville, MD 210931982662177
- David Hutcheon, M.D.Lutherville Timonium, MD 210931679551865
- David Kafonek, M.D.Lutherville, MD 210931609834894
Common questions
What is Robert Lien Yin, M.D.'s NPI number?
Robert Lien Yin, M.D.'s National Provider Identifier (NPI) is 1750483863, issued on Sep 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert Lien Yin, M.D. located?
The NPPES record lists a practice address at 404 E Timonium RD, Timonium, MD, 21093. Phone: (410) 530-0113. Providers update this record themselves, so call before visiting.
How can I verify Robert Lien Yin, M.D.'s license?
NPPES lists Maryland license number D0030264, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert Lien Yin, M.D. prescribe under Medicare Part D?
In 2024, Robert Lien Yin, M.D. had 195 Medicare Part D claims for 134 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.