Gary Guo, MD
Internal Medicine Physician · Valhalla, NY
Gary Guo, MD is an internal medicine physician with a practice address in Valhalla, New York, and NPI 1932129582, issued on Jul 19, 2006. Check the license (New York 234103, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Gary Guo
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 234103 NY
Self-reported in NPPES; status is on the state search - Practice location
- 95 Grasslands RD-Nymc, Valhalla, NY 10595
- Phone
- (914) 493-8370
- Enumerated
- Jul 19, 2006
- Record last updated
- Feb 29, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (914) 594-4434
- Medicare enrollment
- Enrolled (PECOS I20050326000022); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 95 Grasslands RD-Nymc
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dipak Chandy, MDPulmonary Disease Physician1710900410
- William Frishman, MDCardiovascular Disease Physician1467476168
- Andrew Gutwein, MDInternal Medicine Physician1801816483
- Madhavi Koka, MDHospitalist Physician1073535589
- Stuart Lehrman, MDPulmonary Disease Physician1699798314
- George Maguire, MDPulmonary Disease Physician1881617504
Verify Gary Guo 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 234103Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
19 Medicare Part D claims, against an average of 3,176 among the 108,855 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.
Industry payments in 2024: $438.22
16 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Westchester Medical Center Advanced Physician Services PCValhalla, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gary Guo among 12,067 internal medicine physician records in New York
Gary Guo, MD is one of 12,067 internal medicine physician records with a practice address in New York. 79% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1982 · median 2002 among the 7,221 with a school on file
- Record last updated2008 · 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 207R00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
68 internal medicine physician records list a practice address in Valhalla
They are 68 of the 2,105 NPPES records with a practice address in Valhalla, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in Valhalla → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ronald Cho, MDValhalla, NY 105951457388977
- Rosemarie Conigliaro, MDValhalla, NY 105951538170717
- Mitchell Fenster, M.D.Valhalla, NY 105951548378573
- Melissa Gennarelli, M.D.Valhalla, NY 105951871557249
- Randy Goldberg, MDValhalla, NY 105951154329936
- Andrew Gutwein, MDValhalla, NY 105951801816483
- Wei-Nchih Lee, MDValhalla, NY 105951750301305
- Anne Beth Litt, M.D.Valhalla, NY 105951376574293
Common questions
What is Gary Guo, MD's NPI number?
Gary Guo, MD's National Provider Identifier (NPI) is 1932129582, issued on Jul 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary Guo, MD located?
The NPPES record lists a practice address at 95 Grasslands RD-Nymc, Valhalla, NY, 10595. Phone: (914) 493-8370. Providers update this record themselves, so call before visiting.
How can I verify Gary Guo, MD's license?
NPPES lists New York license number 234103, 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 Gary Guo, MD prescribe under Medicare Part D?
In 2024, Gary Guo, MD had 19 Medicare Part D claims; 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.