Ruth G. Diaz, MD
Internal Medicine Physician · Hauppauge, NY
Ruth G. Diaz, MD is an internal medicine physician with a practice address in Hauppauge, New York, and NPI 1235119066, issued on Jan 18, 2006. Check the license (New York 116667, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Ruth G. Diaz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 116667 NY
Self-reported in NPPES; status is on the state search - Practice location
- 515 Route 111, Hauppauge, NY 11788
- Phone
- (631) 224-1819
- Enumerated
- Jan 18, 2006
- Record last updated
- Feb 25, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (631) 224-1812
- Medicaid ID
- 00847970 NY
- Medicare enrollment
- Enrolled (PECOS I20110308000646); 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 515 Route 111
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ruth G. Diaz 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 116667Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average internal medicine physician in 2024
963 Medicare Part D claims for 79 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Pravastatin Sodium72 claims
- Ramipril66 claims
- Amlodipine Besylate46 claims
- Levothyroxine Sodium41 claims
- Metoprolol Succinate40 claims
- Zolpidem Tartrate27 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.
Bills Medicare through one group practice
- Comprehensive Medical Associates PLLCHauppauge, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ruth G. Diaz among 12,067 internal medicine physician records in New York
Ruth G. Diaz, 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
- Graduated1966 · median 2002 among the 7,221 with a school on file
- Record last updated2020 · 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).
15 internal medicine physician records list a practice address in Hauppauge
They are 15 of the 1,043 NPPES records with a practice address in Hauppauge, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in Hauppauge → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Alan Bigman, M.D.Hauppauge, NY 117881215975701
- Humayun Chaudhry, D.O.Hauppauge, NY 117881699764829
- Christopher D'Ambrosio, D.O.Hauppauge, NY 117881942543459
- Sudha Dubey, M.D.Hauppauge, NY 117881013296854
- Sanjay Galhotra, MDHauppauge, NY 117881124344411
- Sekhar Gollapalli, M.DHauppauge, NY 117881619932167
- Nilofar Hava, M.D.Hauppauge, NY 117881023041092
- Anubhav Kaul, M.D.Hauppauge, NY 117881023457975
Common questions
What is Ruth G. Diaz, MD's NPI number?
Ruth G. Diaz, MD's National Provider Identifier (NPI) is 1235119066, issued on Jan 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ruth G. Diaz, MD located?
The NPPES record lists a practice address at 515 Route 111, Hauppauge, NY, 11788. Phone: (631) 224-1819. Providers update this record themselves, so call before visiting.
How can I verify Ruth G. Diaz, MD's license?
NPPES lists New York license number 116667, 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 Ruth G. Diaz, MD prescribe under Medicare Part D?
In 2024, Ruth G. Diaz, MD had 963 Medicare Part D claims for 79 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.