Gregory Lee Riley, MD
Hospitalist Physician · New York, NY
Gregory Lee Riley, MD is a hospitalist physician with a practice address in New York, New York, and NPI 1649968116, issued on Apr 24, 2023. Check the license (New York 341499, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Gregory Lee Riley
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License numbers
- 341499 NY
13-3971298 NY
Self-reported in NPPES; status is on the state search - Practice location
- 550 1St Ave, New York, NY 10016
- Phone
- (212) 263-5506
- Enumerated
- Apr 24, 2023
- Record last updated
- Jul 11, 2026
- Medicare enrollment
- Enrolled (PECOS I20260506001013); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 2,067 in New York → Look up another NPI →
Also registered at 550 1St Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Germeen AbdelmessihAcute Care Nurse Practitioner1134840028
- Kathryn Abe-Ridgway, MDStudent in an Organized Health Care Education/Training Program1629865324
Verify Gregory Lee Riley in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 341499Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average hospitalist physician in 2024
62 Medicare Part D claims for 18 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
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.
Gregory Lee Riley among 2,067 hospitalist physician records in New York
Gregory Lee Riley, MD is one of 2,067 hospitalist physician records with a practice address in New York. 93% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 97% of them.
- NPI issued2023 · 97% of these records are older, under 1% newer
- In a Medicare fileYes · 93% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated2023 · median 2013 among the 1,716 with a school on file
- Record last updated2026 · 37% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in New York
There are 2,067 hospitalist physician records in New York.
All 2,067 in New York → Every provider in New York → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- John Chelico, MD, MA, FACPNew York, NY 100161932328754
- Cindy Fang, M.D.New York, NY 100161487915070
- Arpit Gupta, MDNew York, NY 100161295099448
- Adam Harris, M.D.New York, NY 100161336586551
- Brianna Knoll, MDNew York, NY 100161649661364
- James Lebret, MDNew York, NY 100161457518870
- Richard Lin, M.D., PH.D.New York, NY 100161952598898
- Nikita Nagpal, MDNew York, NY 100161366862575
Common questions
What is Gregory Lee Riley, MD's NPI number?
Gregory Lee Riley, MD's National Provider Identifier (NPI) is 1649968116, issued on Apr 24, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Lee Riley, MD located?
The NPPES record lists a practice address at 550 1St Ave, New York, NY, 10016. Phone: (212) 263-5506. Providers update this record themselves, so call before visiting.
How can I verify Gregory Lee Riley, MD's license?
NPPES lists New York license number 341499, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory Lee Riley, MD prescribe under Medicare Part D?
In 2024, Gregory Lee Riley, MD had 62 Medicare Part D claims for 18 beneficiaries; the average among hospitalist physician prescribers was 521. 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.